期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到9篇文章
< 1 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
A three-dimensional statistical damage model for rock-like materials based on principal stress action 认领 引用
1
作者 Jun Xu Sen Luo Shihe Sun 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2026年第1期86-94,共9页
Principal stress plays a critical role in the deformation and failure process of rock or rock-like materials.However,existing studies indicate that the construction of a damage model based on principal stresses for de... Principal stress plays a critical role in the deformation and failure process of rock or rock-like materials.However,existing studies indicate that the construction of a damage model based on principal stresses for describing the entire process of three-dimensional rock fracturing is subject to certain limitations and inadequacies.In this study,an innovative three-dimensional statistical damage constitutive model is developed by integrating the principal stress effect with the Gamma distribution function.This model effectively captures the complete damage evolution process of rock materials with initial defects through the introduction of a compaction correction coefficient and a residual strength correction term.Notably,the simulation accuracy is significantly enhanced in both the initial compaction stage and the post-peak residual strength stage.The parameter θ serves as an indicator of the material brittle-to-ductile transition,whereas the parameter k reflects the material's strength characteristics.The parameter calibration process consists of three steps:determining the θ value on the basis of the rock brittleness index,deriving the k parameter from the k value growth curve,and finally establishing the peak-residual strength prediction equation under given confining pressure conditions.Compared with the traditional statistical damage model based on the Weibull distribution,this model not only features clear physical significance and a simplified calculation procedure but also contributes to the advancement of the three-dimensional damage fracture theory system for rock mechanics.Moreover,it offers a robust framework for evaluating the mechanical response of rocks under varying confining pressures,which has significant implications for safe design and risk assessment in civil engineering or rock engineering. 展开更多
关键词 Principal stress Statistical damage model Gamma distribution Compaction stage Residual strength
暂未订购 下载PDF
Modified tensile-shear statistical damage constitutive model based on AE clustering for rock and concrete materials under thermal-mechanical loading 认领 引用
2
作者 Kai SHEN Jia-peng LIU +3 位作者 Qiu-hua RAO Ze-lin LIU Shao-bo JIN Peng LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第8期2424-2442,共19页
Uniaxial compression tests combined with acoustic emission(AE)monitoring were conducted on the sandstone and concrete specimens to measure the physical and mechanical properties and analyze the damage evolution after ... Uniaxial compression tests combined with acoustic emission(AE)monitoring were conducted on the sandstone and concrete specimens to measure the physical and mechanical properties and analyze the damage evolution after heating test.A modified thermal-mechanical statistical damage constitutive model was established by K-means++clustering algorithm for determining the proportion of tensile and shear cracks in AE data and for defining the new tensile and shear mechanical damage factors of the Weibull distribution.This model is verified to be valid by good agreement with the experimental results. 展开更多
关键词 thermal-mechanical damage statistical damage constitutive model clustering algorithm acoustic emission rock concrete
暂未订购 下载PDF
Brittleness evaluation of gas-bearing coal based on statistical damage constitution model and energy evolution mechanism 认领 引用 被引量：3
3
作者 XUE Yi WANG Lin-chao +5 位作者 LIU Yong RANJITH P G CAO Zheng-zheng SHI Xu-yang GAO Feng KONG Hai-ling 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第2期566-581,共16页
Accurate assessment of coal brittleness is crucial in the design of coal seam drilling and underground coal mining operations.This study proposes a method for evaluating the brittleness of gas-bearing coal based on a ... Accurate assessment of coal brittleness is crucial in the design of coal seam drilling and underground coal mining operations.This study proposes a method for evaluating the brittleness of gas-bearing coal based on a statistical damage constitutive model and energy evolution mechanisms.Initially,integrating the principle of effective stress and the Hoek-Brown criterion,a statistical damage constitutive model for gas-bearing coal is established and validated through triaxial compression tests under different gas pressures to verify its accuracy and applicability.Subsequently,employing energy evolution mechanism,two energy characteristic parameters(elastic energy proportion and dissipated energy proportion)are analyzed.Based on the damage stress thresholds,the damage evolution characteristics of gas bearing coal were explored.Finally,by integrating energy characteristic parameters with damage parameters,a novel brittleness index is proposed.The results demonstrate that the theoretical curves derived from the statistical damage constitutive model closely align with the test curves,accurately reflecting the stress−strain characteristics of gas-bearing coal and revealing the stress drop and softening characteristics of coal in the post-peak stage.The shape parameter and scale parameter represent the brittleness and macroscopic strength of the coal,respectively.As gas pressure increases from 1 to 5 MPa,the shape parameter and the scale parameter decrease by 22.18%and 60.45%,respectively,indicating a reduction in both brittleness and strength of the coal.Parameters such as maximum damage rate and peak elastic energy storage limit positively correlate with coal brittleness.The brittleness index effectively captures the brittleness characteristics and reveals a decrease in brittleness and an increase in sensitivity to plastic deformation under higher gas pressure conditions. 展开更多
关键词 gas pressure statistical damage constitutive model energy evolution mechanism brittleness evaluation gas bearing coal
暂未订购 下载PDF
Multi-scale damage and fracture analysis and statistical damage constitutive model of shallow coral reef limestone based on digital core 认领 引用 被引量：1
4
作者 Yingwei Zhu Xinping Li +4 位作者 Zhengrong Zhou Dengxing Qu Fei Meng Shaohua Hu Wenjie Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第11期1849-1869,共21页
Coral reef limestone(CRL)constitutes a distinctive marine carbonate formation with complex mechanical properties.This study investigates the multiscale damage and fracture mechanisms of CRL through integrated experime... Coral reef limestone(CRL)constitutes a distinctive marine carbonate formation with complex mechanical properties.This study investigates the multiscale damage and fracture mechanisms of CRL through integrated experimental testing,digital core technology,and theoretical modelling.Two CRL types with contrasting mesostructures were characterized across three scales.Macroscopically,CRL-I and CRL-II exhibited mean compressive strengths of 8.46 and 5.17 MPa,respectively.Mesoscopically,CRL-I featured small-scale highly interconnected pores,whilst CRL-II developed larger stratified pores with diminished connectivity.Microscopically,both CRL matrices demonstrated remarkable similarity in mineral composition and mechanical properties.A novel voxel average-based digital core scaling methodology was developed to facilitate numerical simulation of cross-scale damage processes,revealing network-progressive failure in CRL-I versus directional-brittle failure in CRL-II.Furthermore,a damage statistical constitutive model based on digital core technology and mesoscopic homogenisation theory established quantitative relationships between microelement strength distribution and macroscopic mechanical behavior.These findings illuminate the fundamental mechanisms through which mesoscopic structure governs the macroscopic mechanical properties of CRL. 展开更多
关键词 Coral reef limestone Multi-scale mechanics Digital core Pore structure Representative volume element Damage and fracture Damage statistical constitutive model
暂未订购 下载PDF
Theoretical analysis of characteristics of acoustic emission in rock failure based on statistical damage mechanics 认领 引用 被引量：1
5
作者 WEN Guang-cai YANG Hui-ming ZOU Yin-hui 《Journal of Coal Science & Engineering(China)》 2009年第3期237-242,共6页
Based on statistical damage mechanics,the constitutive model of a rock underthree-dimensional stress was established by the law that the statistical strength of rockmicro-element obeys Weibull distribution.The acousti... Based on statistical damage mechanics,the constitutive model of a rock underthree-dimensional stress was established by the law that the statistical strength of rockmicro-element obeys Weibull distribution.The acoustic emission (AE) evolution model ofrock failure was put forward according to the view that rock damage and AE were consistent.Moreover,in the failure process of rock under three-dimensional stress,the change inrelationship between stress condition parameter and the characteristic parameters of AE,such as the event number and its change rate,were studied.Also,the rock AE characteristicunder uniaxial compression was analyzed in theory and verified with examples.Theresults indicate that the cumulative event number and change rate of AE in rock failure aredetermined by stress state parameter F.Along with the gradual increase of F,first the cumulativeevent number increases gradually,then rapidly,and then slowly after the stresspeak.The form of change rate of an event by increasing F is consistent with the distributionform of rock micro-element strength.The model explained the phenomenon that a relativelyquiet period of AE appears before rock rupture that is observed by many researchersin experiments.Verification examples indicate that the AE evolution model is consistentwith the test results,so the model is reasonable and correct. 展开更多
关键词 rock acoustic emission statistical damage 3-dimensional stress Mohr-coulo mb criteria
暂未订购 下载PDF
A Modified Model for Soil–Structure Interface Considering Random Damage of Mesoscopic Contact Elements 认领 引用
6
作者 KE Li-jun GAO Yu-feng +2 位作者 ZHAO Zi-hao LI Da-yong JI Jian 《China Ocean Engineering》 SCIE EI CSCD 2023年第5期807-818,共12页
The interaction between soil and marine structures like submarine pipeline/pipe pile/suction caisson is a complicated geotechnical mechanism process.In this study,the interface is discretized into multiple mesoscopic ... The interaction between soil and marine structures like submarine pipeline/pipe pile/suction caisson is a complicated geotechnical mechanism process.In this study,the interface is discretized into multiple mesoscopic contact elements that are damaged randomly throughout the shearing process due to the natural heterogeneity.The evolution equation of damage variable is developed based on the Weibull function,which is able to cover a rather wide range of distribution shapes by only two parameters,making it applicable for varying scenarios.Accordingly,a statistical damage model is established by incorporating Mohr–Coulomb strength criterion,in which the interfacial residual strength is considered whereby the strain softening behavior can be described.A concept of“semi-softening”characteristic point on shear stress–displacement curve is proposed for effectively modeling the evolution of strain softening.Finally,a series of ring shear tests of the interfaces between fine sea sand and smoothough steel surfaces are conducted.The predicted results using the proposed model are compared with experimental data of this study as well as some results from existing literature,indicating that the model has a good performance in modeling the progressive failure and strain softening behavior for various types of soil–structure interfaces. 展开更多
关键词 soil–structure interface statistical damage model mesoscopic element Weibull function “semi-softening”characteristic point
暂未订购 下载PDF
A thermo-mechanical damage constitutive model for deep rock considering brittleness-ductility transition characteristics 认领 引用 被引量：10
7
作者 FENG Chen-chen WANG Zhi-liang +2 位作者 WANG Jian-guo LU Zhi-tang LI Song-yu 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第7期2379-2392,共14页
This paper developed a statistical damage constitutive model for deep rock by considering the effects of external load and thermal treatment temperature based on the distortion energy.The model parameters were determi... This paper developed a statistical damage constitutive model for deep rock by considering the effects of external load and thermal treatment temperature based on the distortion energy.The model parameters were determined through the extremum features of stress−strain curve.Subsequently,the model predictions were compared with experimental results of marble samples.It is found that when the treatment temperature rises,the coupling damage evolution curve shows an S-shape and the slope of ascending branch gradually decreases during the coupling damage evolution process.At a constant temperature,confining pressure can suppress the expansion of micro-fractures.As the confining pressure increases the rock exhibits ductility characteristics,and the shape of coupling damage curve changes from an S-shape into a quasi-parabolic shape.This model can well characterize the influence of high temperature on the mechanical properties of deep rock and its brittleness-ductility transition characteristics under confining pressure.Also,it is suitable for sandstone and granite,especially in predicting the pre-peak stage and peak stress of stress−strain curve under the coupling action of confining pressure and high temperature.The relevant results can provide a reference for further research on the constitutive relationship of rock-like materials and their engineering applications. 展开更多
关键词 deep rock crack initiation threshold thermo-mechanical coupling statistical damage model distortion energy theory
暂未订购 下载PDF
Effect of volume changes on complete deformation behavior of rocks 认领 引用 被引量：2
8
作者 赵衡 曹文贵 +1 位作者 李翔 张玲 《Journal of Central South University》 SCIE EI CAS 2010年第2期394-399,共6页
For the purpose of describing the deformation characteristics of rocks,the effect of volume changes on mechanical properties of rocks should be taken into account with relation to the development of constitutive model... For the purpose of describing the deformation characteristics of rocks,the effect of volume changes on mechanical properties of rocks should be taken into account with relation to the development of constitutive model.Firstly,rocks are divided into three parts,i.e.,voids,a damaged part and an undamaged part in the course of loading.The void ratio was applied to describing the changes of voids or pores during the deformation process.Then,using statistical damage theory,a constitutive model was developed for rocks to describe their strain softening and hardening on the basis of investigating the relationship between the net stress and apparent stress,in which the influence of volume changes on rock behavior was correctly taken into account,such as the initial phase of compaction and the latter stage of dilation.Thirdly,a method of determining model parameters was also presented.Finally,this model was used to compare the theoretical results with those observed from experiments under conventional triaxial loading conditions. 展开更多
关键词 rock mechanics constitutive model statistical damage theory volume change void ratio
暂未订购 下载PDF
Damage evolution and dynamic response of cement asphalt mortar layer of slab track under vehicle dynamic load 认领 引用 被引量：23
9
作者 ZHU ShengYang FU Qiang +1 位作者 CAI ChengBiao SPANOS Pol D 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第10期1883-1894,共12页
The damage evolution and dynamic performance of a cement asphalt(CA)mortar layer of slab track subjected to vehicle dynamic load is investigated in this paper.Initially,a statistical damage constitutive model for the ... The damage evolution and dynamic performance of a cement asphalt(CA)mortar layer of slab track subjected to vehicle dynamic load is investigated in this paper.Initially,a statistical damage constitutive model for the CA mortar layer is developed using continuous damage mechanics and probability theory.In this model,the strength of the CA mortar elements is treated as a random variable,which follows the Weibull distribution.The inclusion of strain rate dependence affords considering its influence on the damage development and the transition between viscosity and elasticity.Comparisons with experimental data support the reliability of the model.A three-dimensional finite element(FE)model of a slab track is then created with the commercial software ABAQUS,where the devised model for the CA mortar is implemented as a user-defined material subroutine.Finally,a vertical vehicle model is coupled with the FE model of the slab track,through the wheel-rail contact forces,based on the nonlinear Hertzian contact theory.The evolution of the damage and of the dynamic performance of the CA mortar layer with various initial damage is investigated under the train and track interaction.The analysis indicates that the proposed model is capable of predicting the damage evolution of the CA mortar layer exposed to vehicle dynamic load.The dynamic compressive strain,the strain rate,and the induced damage increase significantly with an increase in the initial damage,whereas the dynamic compressive stress exhibits a sharp decrease with the increasing initial damage.Also,it is found that the strain rate dependence significantly influences the damage evolution and the dynamic behavior of the CA mortar layer. 展开更多
关键词 cement asphalt mortar slab track statistical damage constitutive model vehicle-track coupled dynamics damage evolution
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈