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《Chinese Journal of Underground Space and Engineering》 2013-01
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Comparison of Mechanical Properties of Rock under Loading and Unloading Confining Pressure

Li Linfeng(Fujian Research Institute of Communications Science and Technology,Fujian Highway Port &Waterway Engineering Key Lab,Fuzhou 350004,China)  
Triaxial loading tests and unloading confining pressure tests were conducted with the TAW-2000 microcomputer-controlled servo rock compression testing machine,in order to study the rock mechanics properties under loading and unloading confining pressure.The cohesion c and the angle of internal friction  have been further analyzed,which are calculated by Hoek-Brown yield criterion.The results show that,plastic strain softening properties and volume expansion properties are displayed not only in loading,but also in unloading confining pressure,and are easier to happen suddenly under the unloading confining pressure.Moreover,by comparison and analysis of the cohesion c and the angle of internal friction  under loading and unloading confining pressure,the variation relation between rock mechanical parameters and confining pressure is obtained.The research results can provide reference for studying the mechanics and deformation characteristics of rock in underground engineering.
【Fund】: 福建省交通运输厅2007年节约型交通建设项目
【CateGory Index】: TU452
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