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Alteration Mechanism,Classification,and Mechanical Properties of Altered Granite 认领 引用
1
作者 Jinyu Dong Shang Shi +2 位作者 Handong Liu Minghao Ren Jianyong Li 《Journal of Earth Science》 SCIE CAS CSCD 2025年第6期2658-2673,共16页
Altered rock,often encountered in major engineering projects,can seriously affect the stability of rocks and slopes surrounding deeply buried tunnels.This study addressed the alteration mechanism,alteration degree cla... Altered rock,often encountered in major engineering projects,can seriously affect the stability of rocks and slopes surrounding deeply buried tunnels.This study addressed the alteration mechanism,alteration degree classification,and mechanical parameters of altered rock in engineering project areas using field testing,thin slice identification,X-ray diffraction,and major element testing.Results showed that the altered rock types in the areas of the Pingjiang Pumped Storage Power Station,Hunan Province,and a diversion tunnel in northern Xinjiang Uygur Autonomous Region include biotite granodiorite,biotite monzogranite,and cataclastic granite,and that the main alteration mechanisms are chloritization of biotite and clayization of feldspar minerals.The altered rocks were classified as slightly,moderately,or strongly altered according to their apparent characteristics,rebound value,longitudinal wave velocity,metamorphic mineral content,and porosity.The bulk density,elastic modulus,cohesion,and internal friction angle(Poisson’s ratio)of the altered rocks decreased(increased)with increase in the degree of alteration.Numerical simulations showed that in altered rock slope areas,the zone of strong rock alteration and the moderate-strong alteration contact zone exhibit locally large deformations that represent a certain hazard to engineering projects.These results provide valuable guidance and support for major projects in altered rock areas. 展开更多
关键词 altered rock alteration mechanism classification of alteration degree mechanical parameter numerical simulation engineering geology
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Measuring Mechanical Parameters of 2D Materials Based on the Bulge Test 认领 引用
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作者 Xuwei Cui Wenlong Dong +3 位作者 Yuan Hou Guorui Wang Luqi Liu Zhong Zhang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2025年第2期218-228,共11页
The bulge test is a widely utilized method for assessing the mechanical properties of thin films,including metals,polymers,and semiconductors.However,as film thickness diminishes to nanometer scales,boundary condition... The bulge test is a widely utilized method for assessing the mechanical properties of thin films,including metals,polymers,and semiconductors.However,as film thickness diminishes to nanometer scales,boundary conditions dominated by weak van der Waals forces significantly impact mechanical responses.Instead of sample fracture,interfacial shear deformation and delamination become the primary deformation modes,thereby challenging the applicability of conventional bulge models.To accommodate the interfacial effect,a modified mechanical model based on the bulge test has been proposed.This review summarizes recent advancements in the bulge test to highlight the potential challenges and opportunities for future research. 展开更多
关键词 Bulge test 2D material Mechanical parameters Interfacial properties
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Research on rock mechanics parameter prediction based on the frequency spectrum characteristics of vibration while drilling 认领 引用
3
作者 Jia-kang Song Jian-ning Wang +4 位作者 Zhao Ma Yi-guo Xue Rui-rui Cai Fan-meng Kong Lei Gao 《Applied Geophysics》 SCIE CSCD 2026年第1期99-108,428,共10页
To enable real-time prediction of rock mechanical parameters during drilling,this study proposes a method based on vibration-while-drilling(VWD)spectral features.Three-component vibration signals were collected experi... To enable real-time prediction of rock mechanical parameters during drilling,this study proposes a method based on vibration-while-drilling(VWD)spectral features.Three-component vibration signals were collected experimentally,and their dominant frequency,low-frequency energy,and spectral centroid were extracted as predictors.A ridge regression model was developed to map these spectral features to rock mechanical parameters.Compared with conventional drilling parameters,the spectral descriptors capture lithology-dependent stiffness more effectively,with the low-frequency(0-20 Hz)energy showing a strong correlation with rock strength.Validation on tuspecimens achieved high accuracy(mean R2>0.80)and stable calibration between predicted and measured values.Bootstrap and permutation analyses conrmed the consistency and interpretability of feature contributions,while ridge-penalty scanning demonstrated strong resistance to overtting.The proposed approach provides an efcient and interpretable framework for realtime eld prediction of rock mechanical parameters and oers a foundation for multi-lithology and physicsinformed model extensions. 展开更多
关键词 VWD spectral features rock mechanical parameters ridge regression real-time prediction
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Failure mechanism and influencing factors of cement sheath integrity under alternating pressure 认领 引用 被引量：5
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作者 Kuan-Hai Deng Nian-Tao Zhou +4 位作者 Yuan-Hua Lin Yan-Xian Wu Jie Chen Chang Shu Peng-Fei Xie 《Petroleum Science》 SCIE EI CAS CSCD 2023年第4期2413-2427,共15页
The failure of cement sheath integrity can be easily caused by alternating pressure during large-scale multistage hydraulic fracturing in shale-gas well.An elastic-plastic mechanical model of casing-cement sheath-form... The failure of cement sheath integrity can be easily caused by alternating pressure during large-scale multistage hydraulic fracturing in shale-gas well.An elastic-plastic mechanical model of casing-cement sheath-formation(CSF)system under alternating pressure is established based on the Mohr-Coulomb criterion and thick-walled cylinder theory,and it has been solved by MATLAB programming combining global optimization algorithm with Global Search.The failure mechanism of cement sheath integrity is investigated,by which it can be seen that the formation of interface debonding is mainly related to the plastic strain accumulation,and there is a risk of interface debonding under alternating pressure,once the cement sheath enters plasticity whether in shallow or deep well sections.The matching relationship between the mechanical parameters(elastic modulus and Poisson's ratio)of cement sheath and its integrity failure under alternating pressure in whole well sections is studied,by which it has been found there is a“critical range”in the Poisson's ratio of cement sheath.When the Poisson's ratio is below the“critical range”,there is a positive correlation between the yield internal pressure of cement sheath(SYP)and its elastic modulus.However,when the Poisson's ratio is above the“critical range”,there is a negative correlation.The elastic modulus of cement sheath is closely related to its Poisson's ratio,and restricts each other.Scientific and reasonable matching between mechanical parameters of cement sheath and CSF system under different working conditions can not only reduce the cost,but also protect the cement sheath integrity. 展开更多
关键词 Casing-cement sheath-formation system Mechanical model Matching relationship Cement sheath integrity Critical range Mechanical parameters
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Experimental study on the interrelation of multiple mechanical parameters in overburden rock caving process during coal mining in longwall panel 认领 引用 被引量：6
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作者 Daixin Deng Hongwei Wang +2 位作者 Lili Xie Zeliang Wang Jiaqi Song 《International Journal of Coal Science & Technology》 EI CAS CSCD 2023年第4期265-289,共25页
In order to comprehend the dynamic disaster mechanism induced by overburden rock caving during the advancement of a coal mining face, a physical simulation model is constructed basing on the geological condition of th... In order to comprehend the dynamic disaster mechanism induced by overburden rock caving during the advancement of a coal mining face, a physical simulation model is constructed basing on the geological condition of the 21221 mining face at Qianqiu coal mine in Henan Province, China. This study established, a comprehensive monitoring system to investigate the interrelations and evolutionary characteristics among multiple mechanical parameters, including mining-induced stress, displacement, temperature, and acoustic emission events during overburden rock caving. It is suggested that, despite the uniformity of the overburden rock caving interval, the main characteristic of overburden rock lies in its uneven caving strength. The mining-induced stress exhibits a reasonable interrelation with the displacement, temperature, and acoustic emission events of the rock strata. With the advancement of the coal seam, the mining-induced stress undergoes four successive stages: gentle stability, gradual accumulation, high-level mutation, and a return to stability. The variations in other mechanical parameters does not synchronize with the signifcant changes in mining-induced stress. Before the collapse of overburden rock occurs, rock strata temperature increment decreases and the acoustic emission ringing counts surges with the increase of rock strata displacement and mining-induced stress. Therefore, the collaborative characteristics of mining-induced stress, displacement, temperature, and acoustic emission ringing counts can be identifed as the precursor information or overburden rock caving. These results are in good consistent with on-site situation in the coal mine. 展开更多
关键词 Overburden rock caving Multiple mechanical parameters Interrelation characterization Precursor information
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An experimental analysis on the elastic mechanical parameters of weakly-consolidated non-diagenetic gas hydrate sediments 认领 引用 被引量：4
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作者 Zhao Jun Xiang Xinran +7 位作者 Zhao Jinzhou Li Haitao Guo Ping Zhang Liehui Zhou Shouwei Wei Na Li Qingping Pang Weixin 《Natural Gas Industry B》 2019年第4期317-322,共6页
Gas hydrate(hereinafter,"hydrate"for short)in the marine environment mostly lies in weakly consolidated sediments,so its undisturbed coring is difficult and costly.In view of this,it is necessary to understa... Gas hydrate(hereinafter,"hydrate"for short)in the marine environment mostly lies in weakly consolidated sediments,so its undisturbed coring is difficult and costly.In view of this,it is necessary to understand the relationship between acoustic properties and elastic mechanical properties of hydrates through laboratory experiments.In this paper,samples of hydrate sediments were prepared indoors.Then,petrophysical experiments were carried out on these samples to measure the electric parameters and acoustic parameters of hydrate sediments.Finally,according to the theory of elasticity,the dynamic elastic mechanical parameters under three axial compressions,three particle sizes and three shale contents were calculated to analyze their effects on the dynamic elastic mechanical parameters of hydrate sediments under different conditions.And the following research results were obtained.First,when the hydrate saturation is in a certain range,it is in a proportional relationship with the elastic parameters of sediments.Second,when the hydrate saturation is constant,the dynamic Young's modulus of hydrate sediments increases,but the Poisson's ratio has little to do with the axial compression as particle sizes(0.125-1.180 mm)and axial compression increase and shale content decreases.Third,a model of the relationship between the elastic parameters and the shale content and axial compression is established.In conclusion,the dynamic elastic mechanical indexes of gas hydrate obtained from the acoustic logging methodology will solve the above difficulties and the research results provide a reference for calculating the mechanical properties of hydrate sediments by use of logging data. 展开更多
关键词 Gas hydrate Weakly consolidated sediment Well logging data Dynamic elastic mechanical parameters Petrophysical acoustic wave Particle size Axial compression
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Estimating Mechanical Parameters of Hydrate-Bearing Sediments on Basis of Shear Wave Velocity Under Triaxial Compression 认领 引用 被引量：1
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作者 DONG Lin LIAO Hualin +4 位作者 LI Yanlong ZHANG Yajuan BU Qingtao HU Gaowei WU Nengyou 《Journal of Ocean University of China》 SCIE CAS CSCD 2024年第6期1481-1487,共7页
The strength parameters of hydrate-bearing sediments(HBS)are vital to geological risk assessment and control during drilling and production operations.However,current publications mainly focus on the laboratory evalua... The strength parameters of hydrate-bearing sediments(HBS)are vital to geological risk assessment and control during drilling and production operations.However,current publications mainly focus on the laboratory evaluation of strength parameters through triaxial compression,generating results intrinsically deviating from those obtained through petrophysical modeling.In this study,we developed an integrated apparatus that can simultaneously measure wave velocity and the mechanical behaviors of HBS under triaxial compression conditions.A series of experiments were conducted to analyze correlations between wave velocities and strength parameters.Results reveal that the P-and S-wave velocities considerably increase with hydrate saturation and are affected by effective confining pressure.Failure strength and elastic modulus are correlated with P-wave velocity.Finally,semi-empirical models are developed to predict strength parameters based on P-wave velocity and extended to establish longitudinal profiles for strength parameters of hydrate reservoirs in the Nankai Trough.This study offers insights into the acoustic properties of HBS under stress states for the prediction of mechanical parameters during natural gas hydrate development. 展开更多
关键词 natural gas hydrate triaxial shearing test wave velocity mechanical parameter longitudinal profile
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An experimental study on the relationship between acoustic parameters and mechanical properties of frozen silty clay 认领 引用 被引量：5
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作者 Xing Huang DongQing Li +1 位作者 Feng Ming JianHong Fang 《Research in Cold and Arid Regions》 CSCD 2013年第5期596-602,共7页
To study the influence of temperature and water content on ultrasonic wave velocity and to establish the relationship between ultrasonic wave velocity and frozen silty clay strength, ultrasonic tests were conducted to... To study the influence of temperature and water content on ultrasonic wave velocity and to establish the relationship between ultrasonic wave velocity and frozen silty clay strength, ultrasonic tests were conducted to frozen silty clay by using RSM-SY5（T） nonmetal supersonic test meter, and the tensile strength and compressive strength of silty clay were measured under various negative temperatures. Test and analysis results indicate that, ultrasonic wave velocity rapidly changes in the temperature range of-1 ℃ to -5 ℃. Ultrasonic wave velocity increased with an increase of water content until the water content reached the critical water content, while decreased with an increase of water content after the water content exceeded the critical water content. This study showed that there was strong positive correlation between the ul- trasonic wave velocity and the frozen soil strength. As ultrasonic wave velocity increased, either tensile strength or com- pressive strength increased. Based on the experimental data, the relationship between ultrasonic wave velocity and frozen silty clay strength was obtained through regression analysis. It was found that the ultrasonic test technique can be used to test frozen soils and lay the foundation for the determination of frozen soil strength. 展开更多
关键词 artificially frozen soil frozen soil strength ultrasonic wave velocity critical water content dynamic elastic mechanical parameters
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Fast determination of meso-level mechanical parameters of PFC models 认领 引用 被引量：5
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作者 Guo Jianwei Xu Guoan +1 位作者 Jing Hongwen Kuang Tiejun 《International Journal of Mining Science and Technology》 EI CAS 2013年第1期157-162,共6页
To solve the problems of blindness and inefficiency existing in the determination of meso-level mechanical parameters of particle flow code (PFC) models, we firstly designed and numerically carried out orthogonal test... To solve the problems of blindness and inefficiency existing in the determination of meso-level mechanical parameters of particle flow code (PFC) models, we firstly designed and numerically carried out orthogonal tests on rock samples to investigate the correlations between macro-and meso-level mechanical parameters of rock-like bonded granular materials. Then based on the artificial intelligent technology, the intelligent prediction systems for nine meso-level mechanical parameters of PFC models were obtained by creating, training and testing the prediction models with the set of data got from the orthogonal tests. Lastly the prediction systems were used to predict the meso-level mechanical parameters of one kind of sandy mudstone, and according to the predicted results the macroscopic properties of the rock were obtained by numerical tests. The maximum relative error between the numerical test results and real rock properties is 3.28% which satisfies the precision requirement in engineering. It shows that this paper provides a fast and accurate method for the determination of meso-level mechanical parameters of PFC models. 展开更多
关键词 Particle flow code Meso-level mechanical parameter Macroscopic property Orthogonal test Intelligent prediction
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Analysis and optimal synthesis of single loop spatial mechanisms 认领 引用 被引量：3
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作者 Med Amine LARIBI Lotfi ROMDHANE Sad ZEGHLOUL 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2011年第9期665-679,共15页
In this work, a systematic approach is presented to obtain the input-output equations of a single loop 4-bar spatial mechanisms. The dialytic method along with Denavit-Hartenberg parameters can be used to obtain these... In this work, a systematic approach is presented to obtain the input-output equations of a single loop 4-bar spatial mechanisms. The dialytic method along with Denavit-Hartenberg parameters can be used to obtain these equations efficiently. A genetic algorithm （GA） has been used to solve the problem of spatial mechanisms synthesis. Two types of mechanisms, e.g., RSCR and RSPC （R： revolute; S： spherical; C： cylindrical; P： prismatic）, have illustrated the application of the GA to solve the problem of function generation and path generation. In some cases, the GA method becomes trapped in a local minimum. A combined GA-fuzzy logic （GA-FL） method is then used to improve the final result. The results show that GAs, combined with an adequate description of the mechanism, are well suited for spatial mechanism synthesis problems and have neither difficulties inherent to the choice of the initial feasible guess, nor a problem of convergence, as it is the case for deterministic methods. 展开更多
关键词 Spatial mechanisms Genetic algorithm-fuzzy logic （GA-FL） method Denevit-Hartenberg parameters Mechanism synthesis
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Intelligent direct analysis of physical and mechanical parameters of tunnel surrounding rock based on adaptive immunity algorithm and BP neural network 认领 引用 被引量：4
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作者 Xiao-rui Wang Yuan-han Wang Xiao-feng Jia 《Journal of Pharmaceutical Analysis》 CAS 2009年第1期22-30,共9页
Because of complexity and non-predictability of the tunnel surrounding rock,the problem with the determination of the physical and mechanical parameters of the surrounding rock has become a main obstacle to theoretica... Because of complexity and non-predictability of the tunnel surrounding rock,the problem with the determination of the physical and mechanical parameters of the surrounding rock has become a main obstacle to theoretical research and numerical analysis in tunnel engineering.During design,it is a frequent practice,therefore,to give recommended values by analog based on experience.It is a key point in current research to make use of the displacement back analytic method to comparatively accurately determine the parameters of the surrounding rock whereas artificial intelligence possesses an exceptionally strong capability of identifying,expressing and coping with such complex non-linear relationships.The parameters can be verified by searching the optimal network structure,using back analysis on measured data to search optimal parameters and performing direct computation of the obtained results.In the current paper,the direct analysis is performed with the biological emulation system and the software of Fast Lagrangian Analysis of Continua(FLAC3D.The high non-linearity,network reasoning and coupling ability of the neural network are employed.The output vector required of the training of the neural network is obtained with the numerical analysis software.And the overall space search is conducted by employing the Adaptive Immunity Algorithm.As a result,we are able to avoid the shortcoming that multiple parameters and optimized parameters are easy to fall into a local extremum.At the same time,the computing speed and efficiency are increased as well.Further,in the paper satisfactory conclusions are arrived at through the intelligent direct-back analysis on the monitored and measured data at the Erdaoya tunneling project.The results show that the physical and mechanical parameters obtained by the intelligent direct-back analysis proposed in the current paper have effectively improved the recommended values in the original prospecting data.This is of practical significance to the appraisal of stability and informationization design of the surrounding rock. 展开更多
关键词 adaptive immunity algorithm BP neural network physical and mechanical parameters surrounding rock direct-back analysis
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Mechanical performance of hard red sandstone in acoustic emission integrated conventional triaxial compression tests 认领 引用 被引量：1
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作者 Kun DU Ming-hui LIU +4 位作者 Xue-feng LI Li-chang WANG Jian ZHOU Tao YANG Peng LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第6期2021-2035,共15页
A series of acoustic emission(AE)-integrated conventional triaxial compression tests(CTTs)were conducted to evaluate the mechanical properties of hard red sandstone.Under conventional triaxial stress states,the crack ... A series of acoustic emission(AE)-integrated conventional triaxial compression tests(CTTs)were conducted to evaluate the mechanical properties of hard red sandstone.Under conventional triaxial stress states,the crack closure stress,crack initiation stress,and damage stress ranged in 13.75%-22.34%,31.84%-42.19%,and 63.85%-75.93%of the peak strength of sandstone,respectively.The AE parameters reflected the confining pressure(σ3)effect on microcrack propagation,withσ3=5 MPa identified as the threshold affecting both the timing of numerous AE hits and the distribution range of peak frequencies of AE signals before the final failure of each specimen.The AE property analysis showed that shear cracks played a dominant role in rock failure in CCTs,which ranged in 60%-85%of the total number of cracks.A smallerσ3 value promoted shear failure,whereas a largerσ3 value inhibited it.Furthermore,the appropriate dataset selection range to accurately calculate the cohesion force and internal friction angle in CTTs and variable-angle shear tests was determined. 展开更多
关键词 red sandstone mechanical parameters stress threshold,acoustic emission characteristics internal friction angle cohesion force
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Elucidating viscoelastic effects on focused ultrasound thermal therapy with acoustic-solid-thermal coupling analysis 认领 引用 被引量：1
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作者 Zhibo Du Haolong Chen +2 位作者 Weican Li Zhuo Zhuang Zhanli Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第2期41-51,共11页
Focused ultrasound(FUS)therapy generates sufficient heat for medical interventions like tumor ablation by concentrating energy at the focal point.The complex viscoelastic properties of biological tissues pose challeng... Focused ultrasound(FUS)therapy generates sufficient heat for medical interventions like tumor ablation by concentrating energy at the focal point.The complex viscoelastic properties of biological tissues pose challenges in balancing focusing precision and penetration depth,impacting the safety of surrounding tissues and treatment efficacy.This study develops an acoustic-solid-thermal coupling computational model to elucidate the dynamic mechanical response and energy dissipation mechanisms of soft tissue during FUS thermal therapy using a hyper-viscoelastic constitutive model.Results indicate that the high compressibility and low shear resistance of biological tissues result in a unique shear dissipation mechanism.Energy dissipation efficiency per area is indirectly influenced by load frequency via its effect on the dynamic shear modulus and is directly proportional to load amplitude.Focusing precision,represented by the focal zone width,is inversely controlled by frequency via wavelength.A mathematical model for evaluating temperature rise efficiency is proposed,and an optimal frequency for efficient FUS thermal therapy in brain-like soft materials is identified.This research elucidates the link between viscoelastic tissue behavior and FUS treatment outcomes,offering insights for optimizing FUS applications in various medical fields. 展开更多
关键词 Focused ultrasound(FUS) Thermal therapy Acoustic-solid-thermal coupling Hyper-viscoelastic constitutive model Mechanical parameters
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THE APPLICATION OF GENETIC ALGORITHM IN NON-LINEAR INVERSION OF ROCK MECHANICS PARAMETERS 认领 引用
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作者 赵晓东 《Journal of Coal Science & Engineering(China)》 1998年第2期13-16,共4页
The non-linear inversion of rock mechanics parameters based on genetic algorithm is presented. The principIe and step of genetic algorithm is also given. A brief discussion of this method and an application example is... The non-linear inversion of rock mechanics parameters based on genetic algorithm is presented. The principIe and step of genetic algorithm is also given. A brief discussion of this method and an application example is presented at the end of this paper. From the satisfied result, quick, convenient and practical new approach is developed to solve this kind of problems. 展开更多
关键词 genetic algorithm rock mechanics parameters non-linear inversion
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Quantifying fracture evolution characteristics of gravelly sandstones based on fractal theory 认领 引用 被引量：1
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作者 Kai Feng Zhenlin Wang +4 位作者 Guanfang Li Peilin Zhang Zhichao Wang Yujia Wang Kouqi Liu 《Energy Geoscience》 EI CAS CSCD 2025年第4期167-177,共11页
With the advancement of unconventional oil and gas exploration and development,tight gravelly sandstone reservoirs have garnered increasing attention.In this study,triaxial compression experiments are conducted on gra... With the advancement of unconventional oil and gas exploration and development,tight gravelly sandstone reservoirs have garnered increasing attention.In this study,triaxial compression experiments are conducted on gravelly sandstone cores,and correlation analysis is employed to establish the relationships between fractal dimensions of the fractures and rock mechanics parameters.For cores of gravelly sandstone,a positive correlation exists between the fractal dimension and the brittleness index.The prediction model reveals that the error between the predicted and actual values for well 3 is relatively large,which can be attributed to the presence of pure sandstone cores in well 3.Under high confining pressure in the deep strata,rocks exhibit a decreasing trend in fractal dimensions,a phenomenon due to the stress-memory effect.In addition,numerical simulation is further employed to study the effect of the factors that could affect the complexity of the fractures,and the results show that the fractal dimension of gravelly sandstone declines with increasing confining pressure,peak compressive strength,and rock elastic modulus as the loading process intensifies. 展开更多
关键词 Gravelly sandstone Fractal dimension Rock mechanics parameter Triaxial compression test Numerical simulation
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Study on the Seepage Characteristics of Deep Tight Reservoirs Considering the Effects of Creep 认领 引用 被引量：1
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作者 Yongfu Liu Haitao Zhao +4 位作者 Xingliang Deng Baozhu Guan Jing Li Chengqiang Yang Guipeng Huang 《Energy Engineering》 EI 2025年第5期1735-1754,共20页
The seepage characteristics of shale reservoirs are influenced not only by multi-field coupling effects such as stress field,temperature field,and seepage field but also exhibit evident creep characteristics during oi... The seepage characteristics of shale reservoirs are influenced not only by multi-field coupling effects such as stress field,temperature field,and seepage field but also exhibit evident creep characteristics during oil and gas exploitation.The complex fluid flow in such reservoirs is analyzed using a combination of theoretical modeling and numerical simulation.This study develops a comprehensive mathematical model that integrates the impact of creep on the seepage process,with consideration of factors including stress,strain,and time-dependent deformation.The model is validated through a series of numerical experiments,which demonstrate the significant influence of creep on the seepage behavior.The results indicate that the rock mechanical parameters and creep constitutive model were determined through triaxial compression tests and uniaxial creep tests.A creep-seepage coupling control equation for shale was established based on the Burgers creep model.The absolute value of the volumetric strain of shale increases rapidly in the initial creep stage,and the increase in vertical stress accelerates the rock’s creep deformation.During the deceleration creep stage,the volumetric strain of the reservoir increases rapidly,leading to a significant decrease in permeability.In the stable creep stage,the pores and fractures in the rock are further compressed,causing a gradual reduction in permeability,which eventually stabilizes. 展开更多
关键词 Tight reservoir mechanical parameter creep model multi-field coupling seepage characteristics
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Determination of rock mass integrity coefficient using a non-invasive geophysical approach 认领 引用 被引量：11
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作者 Muhammad Hasan Yanjun Shang +2 位作者 Xuetao Yi Peng Shao Meng He 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第6期1426-1440,共15页
Determination of rock mechanical parameters is the most important step in rock mass quality evaluation and has significant impacts on geotechnical engineering practice.Rock mass integrity coefficient(KV)is one of the ... Determination of rock mechanical parameters is the most important step in rock mass quality evaluation and has significant impacts on geotechnical engineering practice.Rock mass integrity coefficient(KV)is one of the most efficient parameters,which is conventionally determined from boreholes.Such approaches,however,are time-consuming and expensive,offer low data coverage of point measurements,require heavy equipment,and are hardly conducted in steep topographic sites.Hence,borehole approaches cannot assess the subsurface thoroughly for rock mass quality evaluation.Alternatively,use of geophysical methods is non-invasive,rapid and economical.The proposed geophysical approach makes useful empirical correlation between geophysical and geotechnical parameters.We evaluated the rock mass quality via integration between KV measured from the limited boreholes and inverted resistivity obtained from electrical resistivity tomography(ERT).The borehole-ERT correlation provided KV along various geophysical profiles for more detailed 2D/3D(two-hree-dimensional)mapping of rock mass quality.The subsurface was thoroughly evaluated for rock masses with different engineering qualities,including highly weathered rock,semi-weathered rock,and fresh rock.Furthermore,ERT was integrated with induced polarization(IP)to resolve the uncertainty caused by water/clay content.Our results show that the proposed method,compared with the conventional approaches,can reduce the ambiguities caused by inadequate data,and give more accurate insights into the subsurface for rock mass quality evaluation. 展开更多
关键词 Geotechnical engineering Rock mass integrity coefficient Rock mechanical parameters Geophysical parameters Electrical resistivity tomography(ERT) Induced polarization(IP)
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Determination of shale macroscale modulus based on microscale measurement:A case study concerning multiscale mechanical characteristics 认领 引用 被引量：12
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作者 Yong Li Jian-Qi Chen +2 位作者 Jiang-Hao Yang Ji-Shan Liu Wang-Shu Tong 《Petroleum Science》 SCIE CAS CSCD 2022年第3期1262-1275,共14页
Shale mechanical properties are important for shale gas production,but the magnitudes are difficult to estimate,standard size cores are hard to sample,and secondary interstice generation is inevitable.This paper propo... Shale mechanical properties are important for shale gas production,but the magnitudes are difficult to estimate,standard size cores are hard to sample,and secondary interstice generation is inevitable.This paper proposes a method for determining shale macroscale modulus,which is determined at a hierarchy of scales from the nano-to macro-scales.Microscale measurements are upscaled to estimate the corresponding magnitudes at the macroscale.A case study is conducted with Silurian shale samples,using the hierarchy scales,gridding nanoindentation,atomic force microscopy(AFM),mineral liberation analysis(MLA),X-ray diffraction(XRD),and uniaxial compression tests.The mineral compositions are analyzed using MLA and XRD,and the shale composition is described in terms of clay minerals,organic matter,and siliceous and carbonate contents.The variation in the Young’s modulus is analyzed based on the recorded indentation depth curves and modulus distributions.The nanoindentation and AFM results are upscaled to the centimeter scale through the Mori-Tanaka method.The upscaled results exhibit satisfactory fitting with the conventional uniaxial compression results,although the fitting of the upscaled AFM results is better than nanoindentation.The proposed approach can be applied to promptly and comprehensively predict the shale mechanical parameters during shale gas exploration. 展开更多
关键词 Mechanical parameters Shale reconstruction Homogenization Mineral distribution Elastic parameters
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Experimental study on the shear behavior of grout-infilled specimens and micromechanical properties of grout-rock interface 认领 引用 被引量：9
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作者 LI Wen-shuai JIANG Bang-you +2 位作者 GU Shi-tan YANG Xu-xu Faiz U.A.SHAIKH 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第5期1686-1700,共15页
The grout-rock interfacial property is one of the key factors associated with the strength of grouted rock masses.In this study,direct shear tests and nanoindentation tests were adopted to investigate the mechanical p... The grout-rock interfacial property is one of the key factors associated with the strength of grouted rock masses.In this study,direct shear tests and nanoindentation tests were adopted to investigate the mechanical properties of the grout-rock interface at both the macroscale and microscale.The cohesion of the cement specimens was higher than that of the grout-infilled joint specimens,while their internal friction angle was lower than that of the grout-infilled joint specimens.A“separation method”for identifying the different phases according to the qualitative and quantitative estimations was introduced,and the irregular interfacial transition zone(ITZ)thickness and elastic modulus were estimated.The ITZ thickness of the grout-infilled sandstone specimen ranged from 0 to 30μm,whereas it was within the range of 10-40μm for the grout-infilled mudstone specimen.The average elastic modulus of the ITZ in grout-infilled sandstone and mudstone specimens was approximately 58.2%and 54.1%lower than that of the bulk grout,respectively.Regarding the incidence of the rock type,the interlacing between the grout and sandstone was better developed.The ITZ with a higher porosity and lower modulus had a significant effect on the mechanical properties of the grout-infilled specimens. 展开更多
关键词 grout-rock interface shear mechanical parameter micromechanical property interfacial transition zone
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Mechanical response of roof rock mass unloading during continuous mining process in underground mine 认领 引用 被引量：10
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作者 胡建华 雷涛 +2 位作者 周科平 罗先伟 杨念哥 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第12期2727-2733,共7页
Taking the test stopes during continuous mining induced roof caving of Tongkeng ore-body No.92 as example, the calculation flow of unloading analysis was established. According to the unloading region division method ... Taking the test stopes during continuous mining induced roof caving of Tongkeng ore-body No.92 as example, the calculation flow of unloading analysis was established. According to the unloading region division method of the affected zone theory, and the deterioration laws of mechanics parameters of unloading rock mass, the continuous mining process in underground mine was analyzed by the software MIDAS/GTS, the mechanical response of roof rock mass unloading was studied, and the differences were analyzed with the conventional simulation. The result shows that the maximum tensile stress, subsidence displacement and equivalent plastic strain of roof rock mass are 1.5 MPa, 20 cm and 1.5% in the unloading analysis, while 1.0 MPa, 13 cm and 0.9% in the conventional analysis. The values of unloading analysis, which are also closer to the actual situation, are greater than those of conventional analysis; the maximum step in continuous mining is 48 m, which shows that the induced treatment of the roof should be carried out after 2 mining steps 展开更多
关键词 continuous mining mining-unload rock mass mechanics mining-unload disturbance region dynamic mechanical parameters
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