Mechanical Properties of Deep-buried Marble Material Under Loading and Unloading Tests  

作　　者：李新平 ZHAO Hang WANG Bin XIAO Taoli 

机构地区：[1]Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology [2]School of Civil Engineering and Architecture, Wuhan University of Technology [3]Changjiang Institute of Survey, Planning, Design and Research [4]School of Urban Construction, Yangtze University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2013年第3期514-520,共7页武汉理工大学学报（材料科学英文版）

基　　金：Supported by National Natural Science Foundation of China(No.50974100);WHUT(NO.125106002)

摘　　要：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.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.

关 键 词：deep-buried material loading and unloading tests mechanical properties strength criterion shear fracture 

分 类 号：TU521.2[建筑科学—建筑技术科学]