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Field load testing of copper extraction aeration pipes under simulated high heap pile 认领 引用
1
作者 Shad M.Sargand Teruhisa Masada Jim Goddard 《International Journal of Mining Science and Technology》 EI CAS 2013年第5期751-756,共6页
Recently a research team at Ohio University,USA,conducted a unique full-scale feld load test to simulate the aeration pipe installations at a copper extraction mine operated in Chile.The overliner material taken from ... Recently a research team at Ohio University,USA,conducted a unique full-scale feld load test to simulate the aeration pipe installations at a copper extraction mine operated in Chile.The overliner material taken from the mine was used in recreating the in situ conditions.Electric heaters were utilized to raise the temperature inside each pipe to simulate the essential element of the copper extraction process.The maximum vertical deflection reached by the test pipes was close to 20%,when the simulated heap pile height was 80 m.The plastic pipes and the overliner material were also tested in the laboratory.Based on the results,the maximum heap pile fll depth was recommended for the aeration system.The results indicated that the vertical deflection was the primary performance index for the aeration pipes installed in heap piles at mines.Lastly,the pipe made of polypropylene resin was super. 展开更多
关键词 Copper extraction Aeration pipe Heap pile Field load test Laboratory testing
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Field Load Test Based SHM System Safety Standard Determination for Rigid Frame Bridge 认领 引用
2
作者 Xilong Zheng Qiong Wang Di Guan 《Structural Durability & Health Monitoring》 EI 2024年第3期361-376,共16页
The deteriorated continuous rigid frame bridge is strengthened by external prestressing. Static loading tests wereconducted before and after the bridge rehabilitation to verify the effectiveness of the rehabilitation ... The deteriorated continuous rigid frame bridge is strengthened by external prestressing. Static loading tests wereconducted before and after the bridge rehabilitation to verify the effectiveness of the rehabilitation process. Thestiffness of the repaired bridge is improved, and the maximum deflection of the load test is reduced from 37.9 to27.6 mm. A bridge health monitoring system is installed after the bridge is reinforced. To achieve an easy assessmentof the bridge’s safety status by directly using transferred data, a real-time safety warning system is createdbased on a five-level safety standard. The threshold for each safety level will be determined by theoretical calculationsand the outcomes of static loading tests. The highest risk threshold will be set at the ultimate limit statevalue. The remaining levels, namely middle risk, low risk, and very low risk, will be determined usingreduction coefficients of 0.95, 0.9, and 0.8, respectively. 展开更多
关键词 Continuous rigid frame bridge rehabilitation long-term monitoring field load test safety standard determination
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Effect of antidepressant treatment on water load test and cortisol changes in patients with functional dyspepsia 认领 引用
3
作者 Huimin Liang Yanru Lu Yulong Chen 《Neural Regeneration Research》 CAS 2007年第7期433-436,共4页
BACKGROUND： It has been demonstrated that patients with functional dyspepsia have experiences social life stress events, and accompanied by psychological disorders, mainly manifested as depression and anxiety.Mental ... BACKGROUND： It has been demonstrated that patients with functional dyspepsia have experiences social life stress events, and accompanied by psychological disorders, mainly manifested as depression and anxiety.Mental factors can lead to excessive gastrointestinal consensual reaction, and result in different brain-gut axis disturbance, and then cause the gastrointestinal sensorimotor abnormality and endocrine changes.OBJECTIVE： To observe the effect of antidepressant treatment on the changes of water load and serum cortisol in patients with functional dyspepsia, and analyze the therapeutic mechanism.DESIGN： A comparative observation.SETTING： The First Affiliated Hospital o Zhengzhou University.PARTICIPANTS： Forty-five patients with functional dyspepsia accompanied by depression were selected from the Department of Gastroenterology, the First Affiliated Hospital of Zhengzhou University from July 2004 to July 2006, and they were 25 - 65 years of age, and their disease courses ranged 1 - 10 years. They were all accorded with the diagnostic standards for Rome Ⅱ functional dyspepsia functional dyspepsia. As the patients＇ will, they were divided into treatment group （n =30, 12 males and 18 females） and control group （n =15, 6 males and 9 females）, and there were no significant differences in the data between the two groups （P 〉 0.05）. The programs were discussed and agreed by the committee of medical ethics of the First Affiliated Hospital of Zhengzhou University. Informed contents were obtained from all the patients.METHODS： In the treatment group, the patients were treated with venlafaxine sustained release capsule （75 mg per day）, and those with sleep disorder were added by benzodiazepines （alprazolam）. In the control group, the patients were given routine treatments of antacid, prokinetics, etc. Before and after 8-week treatment, the following examinations were performed： ① The gastrointestinal symptoms were assessed according to the symptoms; ② The severity of depression was evaluated with Hamilton depression scale （HAMD）; ③The relaxation of proximal stomach was observed using water load test; ④ The serum level of cortisol was detected.MAIN OUTCOME MEASURES： ① Symptom score; ② HAMD score; ③ Water load amount; ④Serum level of cortisol.RESULTS： All the 45 patients were involved in the analysis of results. ① Symptom score： The scores of gastrointestinal symptoms were decreased as compared with those before treatment in both the treatment group and control group （P 〈 0.05）. ② HAMD scores： The scores of HAMD were decreased as compared with those before treatment in both the treatment group and control group （P 〈 0.05）. ③ Water load amount：The total effective rate was significantly higher in the treatment group than the control group （P 〈 0.05）. ④The serum levels of cortisol after treatment were significantly lower than those before treatment in the patients with severe gastrointestinal symptoms in the treatment group and control group （P 〈 0.05）.CONCLUSION： Antidepressants can normalize the cortisol level of patients with functional dyspepsia, and then decrease gastric sensitivity and ameliorates the receptive relaxation of proximal stomach, also increase the water load amount correspondingly, and finally control the gastrointestinal symptoms of functional dyspepsia. 展开更多
关键词 functional dyspepsia mental factors water load test hydrocortisone
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Static load test and load transfer mechanism study of squeezed branch and plate pile in collapsible loess foundation 认领 引用 被引量：13
4
作者 GAO Xiao-juan WANG Jin-chang ZHU Xiang-rong 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2007年第7期1110-1117,共8页
As a special geological phenomenon, the character of collapsible loess foundation is collapsible when penetrated by water. This character leads to the soil losing load bearing capacity largely and may lead to foundati... As a special geological phenomenon, the character of collapsible loess foundation is collapsible when penetrated by water. This character leads to the soil losing load bearing capacity largely and may lead to foundation failure. Pile is a popular foundation used in collapsible loess. The squeezed branch and plate pile is a new type of pile developed in recent years and has not be used in a project before. In this paper three squeezed branch and plate piles are tested in collapsible loess after immersion processing. The results may be used for reference in similar construction project, and to provide theoretical references for de- signing of the squeezed branch and plate piles in engineering practice. 展开更多
关键词 Collapsible loess foundation Squeezed branch and plate pile Immersion processing Full-scale static load test
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Improved fault location method for AT traction power network based on EMU load test 认领 引用 被引量：1
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作者 Guosong Lin Xuguo Fu +1 位作者 Wei Quan Bin Hong 《Railway Engineering Science》 2022年第4期532-540,共9页
The autotransformer(AT)neutral current ratio method is widely used for fault location in the AT traction power network.With the development of high-speed electrified railways,a large number of data show that the relat... The autotransformer(AT)neutral current ratio method is widely used for fault location in the AT traction power network.With the development of high-speed electrified railways,a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point(Q-L relation)is mostly nonlinear.Therefore,the linear Q-L relation in the traditional fault location method always leads to large errors.To solve this problem,a large number of load-related current data that can be used to describe the Q-L relation are obtained through the load test of the electric multiple unit(EMU).Thus,an improved fault location method based on the back propagation(BP)neural network is proposed in this paper.On this basis,a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method,respectively,which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power network.Finally,combined with a shortcircuit test,the accuracy of the improved method is verified. 展开更多
关键词 Fault location EMU load test BP neural network AT traction power network High-speed electrified railway
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Analysis of the Application of Static Load Test in Bridge Bearing Capacity Testing 认领 引用 被引量：3
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作者 Wei Fu Bo Liu 《Journal of Architectural Research and Development》 2024年第3期36-41,共6页
This article uses real engineering projects as examples to analyze how static load test technology is applied in testing the bridge-bearing capacity.The analysis covers aspects such as testing section layout,test load... This article uses real engineering projects as examples to analyze how static load test technology is applied in testing the bridge-bearing capacity.The analysis covers aspects such as testing section layout,test load and efficiency coefficient,loading plan,evaluation optimization,test result modification,and result evaluation.The aim is to support the accurate detection and evaluation of bridge-bearing capacity. 展开更多
关键词 Bridge engineering Bearing capacity Static load test Loading plan Test evaluation
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Technical Analysis of Highway Bridge Static Load Test 认领 引用 被引量：1
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作者 Ke Tu Yingying Ye +2 位作者 Daqing Wu Yunyong Zhou Wenming Deng 《Journal of Architectural Research and Development》 2023年第3期58-63,共6页
Highway bridges are an important part of the transportation industry and can promote social economic construction and development.In actual operation,highway bridges are often damaged due to overload and natural facto... Highway bridges are an important part of the transportation industry and can promote social economic construction and development.In actual operation,highway bridges are often damaged due to overload and natural factors,which tend to affect the safety and shorten the service life of these bridges.Assessing the overall state and performance of highway bridges is therefore a key element.Static load test,which is a type of sustainable detection experiment,has many advantages,including low cost,high efficiency,and high accuracy.In this paper,the bridge structure is analyzed through the application of theoretical calculations and relevant comparisons,so as to judge the operating state of the bridge. 展开更多
关键词 Highway bridge Static load test Detection technology
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A Reliable Method of Pile Load Test on Cast-in-Situ Pile Group of Existing Building for Retrofitting 认领 引用
8
作者 Upal Mohammad Towfiqul Quadir 《Journal of Civil Engineering and Architecture》 2014年第7期881-887,共7页
Following the foundation failure of a building, with an aim of economical solution to strengthen other existing buildings of the same project, a new arrangement was implemented experimentally to test the adequacy of l... Following the foundation failure of a building, with an aim of economical solution to strengthen other existing buildings of the same project, a new arrangement was implemented experimentally to test the adequacy of load bearing capacity of a few selected cast-in-situ RCC （reinforced cement concrete） pile groups without demolishing the existing buildings. In this test, the column bottom of an existing building was removed by the help of scaffolding and after that a frame system consisting tension piles and hollow beam was constructed over the pile cap of the to be tested pile group. The load was tested by the help of hydraulic jack system and the constructed frame system. This paper contains the detailed plan, arrangement and method of the test with illustrations. The deflection and loading data analysis is also included which was performed to determine the outcome of the test. Through this test method the appropriate assessment of capacity of pile group of existing building could be done successfully and in result the structure could be saved by only super structure retrofitting. 展开更多
关键词 Cast-in-situ pile load test load bearing capacity retrofitting.
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Discussion on bearing capacity of soft rock ground based on in-situ load test 认领 引用
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作者 Gao Wenhua Zhu Jianqun Huang Ziyong Liu Dong 《Engineering Sciences》 2010年第4期37-41,共5页
The suitability of five methods was discussed here,taking the typical results from in-situ load test of Renshou Mansion and Caifu Plaza in Yueyang City for example.It shows that bearing capacity can be obtained by the... The suitability of five methods was discussed here,taking the typical results from in-situ load test of Renshou Mansion and Caifu Plaza in Yueyang City for example.It shows that bearing capacity can be obtained by the proportion load and limit load from p-s curve with the first and the second point of contraflexure easily.It is recommended that the accurate value of bearing capacity can be obtained by hyperbola fitting method and minimum curvature radius method theoretically.The rebound method is clear in principle,in which the elastoplasticity characteristic is thought about.Out of consideration for the unsteadiness and unobviousness of bearing capacity from relative settlement method,it can be only adopted as reference.So bearing capacity of soft rock ground should be determined by weathering condition of soft rock and curve type. 展开更多
关键词 rock mechanics soft rock bearing capacity of ground in-situ load test of rock ground characteristic curve
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Plate Load Tests on Municipal Solid Waste Dump Site to Assess Ground Improvement Alternatives 认领 引用
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作者 N.G. Dalal C.H. Solanki A.K. Desai 《Journal of Environmental Science and Engineering》 2011年第7期910-914,共5页
Urbanization is the physical growth of urban areas as a result of global change. As the land cost is increasing tremendously and decreasing availability of good construction site is building up pressure on the enginee... Urbanization is the physical growth of urban areas as a result of global change. As the land cost is increasing tremendously and decreasing availability of good construction site is building up pressure on the engineers to utilize even the poorest site either by providing special type of foundation or by improving ground in urban centres. In this context literature is reviewed for use of landfill site for housing. The site exploration for old dump site was carried out to assess subsoil characteristics. The objective was to evolve strategy for economical feasible ground improvement technique to obtain permissible bearing capacity of 150 kPa and total settlement not more than 50 mm. The tests carried out are load tests with geotextile mat and stone filled wire mess matress. The analysis was attempted to evaluate the soil response and bearing capacity. The site can be used for construction of low rise housing for rehabilitation of displaced persons under TP scheme within city area utilizing old landfill sites. 展开更多
关键词 Municipal solid waste ground improvement load tests low rise housing bearing capacity.
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Static Load Test Detection of Continuous Rigid- Frame Railway Bridge 认领 引用
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作者 Jing Cao Lei An 《Journal of Architectural Research and Development》 2023年第5期1-7,共7页
The quality of the continuous rigid-frame railway bridge is related to the safety of train operation,so it is necessary to test its stiffness,strength,and other indicators.Static load test is a common technique for br... The quality of the continuous rigid-frame railway bridge is related to the safety of train operation,so it is necessary to test its stiffness,strength,and other indicators.Static load test is a common technique for bridge inspection.This article summarizes the purpose of the static load test for a continuous rigid-frame railway bridge,including the required equipment,operation methods,etc.,and lists examples to analyze the operation process and precautions of static load test,hoping to provide reference information for relevant personnel. 展开更多
关键词 Railway bridge Rigid-frame Static load test
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Load Test Analysis and Research on Long-Span Concrete Continuous Rigid Frame Bridge 认领 引用
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作者 Lin Nan Yan Liu +3 位作者 Guangjun Li Yingying Ye Shuguo Wang Qiang Yang 《Journal of Architectural Research and Development》 2023年第2期53-58,共6页
Based on the as-built load test of a large bridge,this paper introduces the procedure of the prestressed concrete continuous rigid frame bridge load test.Numerical analysis of the bridge was carried out by simulating ... Based on the as-built load test of a large bridge,this paper introduces the procedure of the prestressed concrete continuous rigid frame bridge load test.Numerical analysis of the bridge was carried out by simulating and establishing a finite element model,and comparative analysis was carried out with the measured values.The results show that the calculated values were basically consistent with the measured values,which showed that the establishment method of the model was reasonable,and the mechanical performance of the bridge met the service requirements of the designed live load. 展开更多
关键词 Bridge Continuous rigid frame Load test
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Load Testing in Bridge Maintenance 认领 引用
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作者 Bo Liu Xu Meng +1 位作者 Ji Li Zhi Tu 《Journal of Architectural Research and Development》 2024年第3期63-68,共6页
Highway bridges are a crucial component in road transportation networks.These bridges must be maintained according to usage requirements regularly.Test results must be considered before devising a maintenance plan.Loa... Highway bridges are a crucial component in road transportation networks.These bridges must be maintained according to usage requirements regularly.Test results must be considered before devising a maintenance plan.Load testing is a vital method of assessing the quality and performance of highway bridges.The outcomes of these tests facilitate the formulation of maintenance plans.This article examines the definition of load testing,its significance,and the process of execution,with the goal of providing support for bridge inspection and maintenance. 展开更多
关键词 Highway bridge Load test and inspection Bridge maintenance
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Load Test and Bearing Capacity Evaluation of Post-strengthened Simply Supported T-beam Bridge 认领 引用
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作者 DUJinglin 《外文科技期刊数据库（文摘版）工程技术》 2022年第4期170-174,共5页
At present, the research on the evaluation of the bearing capacity of simply supported T-beam bridges after repair and reinforcement is relatively small. This paper introduces the load test process of such bridges in ... At present, the research on the evaluation of the bearing capacity of simply supported T-beam bridges after repair and reinforcement is relatively small. This paper introduces the load test process of such bridges in detail. The whole process of the test includes formulating the test method, determining the load distribution and measuring point arrangement, starting the monitoring of the test data, recording the detailed actual test results, and comparing with the theoretical data obtained by effective element analysis. The difference and correlation between the two sets of data are analyzed, and the bearing capacity of simply supported T-beam bridge after reinforcement is evaluated. Through the test, it is found that various data parameters of the spatial beam lattice model are in good agreement with the actual situation. Therefore, through the spatial beam lattice model experiment, a more comprehensive and correct analysis of the bearing capacity of this T-beam bridge is carried out by combining the actual and theoretical methods, and can provide a basis for the formal operation of such bridges. 展开更多
关键词 simply supported T beam after reinforcement load test bearing capacity evaluation
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The Plate Load Test in the Application of Dynamic Compaction Test of Subgrade Bearing Capacity 认领 引用
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作者 Xichang Zhang Yuehong Su Zhi Zhang 《土木工程与技术（中英文版）》 2013年第2期34-39,共6页
This paper mainly introduces the foundation soil after dynamic compaction effect using the plate load test method to test the bearing capacity of foundation soil, based on the plate loading test of a new project in In... This paper mainly introduces the foundation soil after dynamic compaction effect using the plate load test method to test the bearing capacity of foundation soil, based on the plate loading test of a new project in Inner Mongolia, using JYC static load test analysis system software to deal with test data. Also, this paper will discusses the test principle, test points of the plate load test, the determination of bearing capacity characteristic value, etc, and further analysis showing the applicability of the plate load test. 展开更多
关键词 土木工程 建筑工程 建筑设计 建筑材料
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Determination of the strength and elastic modulus of basalt based on point load test 认领 引用
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作者 Jie WU Faquan WU +4 位作者 Danyi LI Lei QIAO Fang ZHANG Bolong LIU Haris SAROGLOU 《Frontiers of Structural and Civil Engineering》 SCIE EI CAS CSCD 2025年第11期1860-1869,共10页
Point load test is an effective method for obtaining the mechanical parameters of the rock.However,the theoretical basis of the test is not clear at present,which greatly limits its acceptability and application.There... Point load test is an effective method for obtaining the mechanical parameters of the rock.However,the theoretical basis of the test is not clear at present,which greatly limits its acceptability and application.Therefore,it is essential to find the theoretical solution for point load test and its testing results.To calculate the uniaxial compressive strength,tensile strength and elastic modulus of rocks,this paper establishes the quantitative relationship between point load strength and rock mechanical parameters based on the theory of elasticity mechanics.The point load tester was used to test 120 cylindrical basalt specimens,the thickness range of basalt is from 18 to 60 mm.Comparing the calculated results with the experimental results,it is found that the prediction error range of the proposed method is from 4%to 8%.The approach provides a new way for predicting the mechanical parameters of the rock. 展开更多
关键词 point load test mechanical parameters basalt elastic mechanics
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Effectiveness of large-diameter combined tip-and-side post-grouted piles in deep fine sand layers:A field test study 认领 引用
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作者 Zhihui Wan Zilong Guo +1 位作者 Guoliang Dai Feng Zhou 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3819-3831,共13页
This study investigates the effectiveness of combined tip-and-side post-grouting on large-diameter bored piles in deep fine sand layers.Field tests were conducted on nine piles for the Shishou Yangtze River Highway Br... This study investigates the effectiveness of combined tip-and-side post-grouting on large-diameter bored piles in deep fine sand layers.Field tests were conducted on nine piles for the Shishou Yangtze River Highway Bridge project.A detailed comparison of pile performance pre-and post-grouting assessed the technique's influence on ultimate bearing capacity and side resistance.The distribution and effectiveness of the cement grout were analysed using core drilling and the standard penetration test(SPT).An equation correlating post-grouting side resistance with the pre-grouting SPT index(NSPT)was established.Results demonstrate a substantial improvement in pile bearing capacity after grouting.Ultimate bearing capacity increased by 76%–152%after grouting.Longer piles on the main bridge exhibited more pronounced enhancement,achieving ultimate capacities 145%–206%higher than those of the shorter approach bridge piles.This is attributed to the greater total cement volume applied along their sides.Critically,combined grouting outperformed side-only grouting,enhancing both side and tip resistance.Core drilling confirmed the spread of cement grout around the piles,confirming the method's effectiveness.SPT results indicated significant increases in the soil NSPT adjacent to the piles following grouting.These findings provide directly applicable data for designing the bridge pile foundations and offer essential guidance for comparable projects in deep fine sand layers. 展开更多
关键词 Bored pile Combined post-grouting Static load test Core drilling test Standard penetration test(SPT) Deep fine sand layer
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Structure design and load test of the small prototype for the JUNO Central Detector 认领 引用
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作者 Xiaoyu Yang Yuekun Heng +9 位作者 Wei He Xiaoyan Ma Lei Yang Jiajie Ling Zhi Wu Kaixi Huang Caishen Wang Ruiting Lei Yatian Pei Xiaohui Qian 《Radiation Detection Technology and Methods》 CSCD 2022年第4期439-450,共12页
Introduction The structure of the Jiangmen Underground Neutrino Observatory(JUNO)CentralDetector(CD)was designed using finite element methods(FEM).The structure of the small JUNOCDprototypewas also designed using the ... Introduction The structure of the Jiangmen Underground Neutrino Observatory(JUNO)CentralDetector(CD)was designed using finite element methods(FEM).The structure of the small JUNOCDprototypewas also designed using the same structural scheme and method as those of the CD,and the load test was carried out after the accomplishment of structure design and manufacturing.Methods The load test can help verify the performance and reliability of the mechanical monitoring system and liquid filling system of the CD,verify the consistency of FEM calculations and axial force measurement results of the sensors,and accumulate experience for the installation of the connecting bars.Conclusion The measurement scheme was considered and determined,and the connecting bars’axial forces under different liquid filling conditions were measured and compared with the FEM results,the consistencies of which were good.The mechanical monitoring system and liquid filling system of theCDwere verified during the load test,which met the requirements of design and experiment. 展开更多
关键词 Structure design Load test Numerical analysis Small prototype Central Detector JUNO
Trajectory generation of heat load test based on gauss pseudospectral method 认领 引用 被引量：6
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作者 ZHANG YuanLong LIU LuHua +1 位作者 TANG GuoJian BAO WeiMin 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第2期273-284,共12页
A new trajectory generation for heat load test is proposed based on gauss pseudospectral method within limit range. Firstly,with multiple path constraints and flight task requirements taken into consideration, heat lo... A new trajectory generation for heat load test is proposed based on gauss pseudospectral method within limit range. Firstly,with multiple path constraints and flight task requirements taken into consideration, heat load parameters are introduced into the dynamics equations. In order to solve the problem of generating such a trajectory within limit range rapidly, the dynamics equations have been normalized by Earth related parameters. Secondly, since the gauss pseudospectral method is just employed to solve the discrete nonlinear programming problem, transformations are developed, which can relate the Lagrange multipliers of the discrete nonlinear programming problem to the costates of the continuous optimal control problem. In addtion, another approach of trajectory generation by tracking the given heat rate is also presented. Finally, simulation results with common aero vehicle(CAV-H) show that the trajectories obtained by both methods can well perform the heat load test with high stagnation heating rate and the large total aeroheating amount; meanwhile, gauss pseudospectral method is better than the compared one in the given range. Furthermore, the 3-D trajectory states and control variables, angle of attack and bank, which are generated by gauss pseudospectral method, can change smoothly. 展开更多
关键词 glide vehicle trajectory generation heat load test gauss pseudospectral method
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Mechanical Properties of Deep-buried Marble Material Under Loading and Unloading Tests 认领 引用 被引量：3
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作者 李新平 ZHAO Hang +1 位作者 WANG Bin XIAO Taoli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第3期514-520,共7页
The mechanical properties are essentially different when rock material is subjected to loading or unloading conditions. In this study, loading and unloading tests with various confining pressures are conducted to inve... The mechanical properties are essentially different when rock material is subjected to loading or unloading conditions. In this study, loading and unloading tests with various confining pressures are conducted to investigate the mechanical properties of marble material samples taken from the deep diversion tunnels of Jinping II Hydropower Station. The stress-strain relationship, failure characteristics and strength criterion are compared and analyzed based on the experiment results. The results show： in the loading and unloading test, peak strength, lateral strain, axial strain and plastic deformation increase significantly as the confining pressure increases. Lateral strain increased significantly and obvious lateral dilatancy can be observed to the change of confining pressure; The fracture mode is mainly the single shear fracture for the triaxial compression test and post-peak test, angle between the failure surface and the ends of the rock material becomes smaller as the confining pressure increases. Hock-Brown strength criterion reflects the strength characteristics of marble material under two different unloading conditions, and has some supplementary effects to the rock material of mechanical field. 展开更多
关键词 deep-buried material loading and unloading tests mechanical properties strength criterion shear fracture
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