(1. College of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454001，China；2. Collaborative Innovation Center of Coal Work Safety，Henan Polytechnic University，Jiaozuo，Henan 454001，China；3. Research Institute for National Defense Engineering of Academy of Military Science PLA China，Luoyang，Henan 471023，China)
Abstract：In order to obtain the variation law of wave velocities of deep rocks under certain confining pressure and continuous loading condition，the triaxial compression tests of granite under confining pressure levels of 40 MPa and 80 MPa were carried out by GCTS RTX–3000 rock mechanics testing system，and the stress-strain curve as well as compression and shear wave velocities was obtained. The results show that the compression and shear wave velocities of granite increase with increasing the confining pressure in a quadratic form. During the triaxial loading process，the compression and shear wave velocities increase sharply and then tend to be stable，while in the process from crack initiation to failure，the wave velocities slowly decrease and then drop sharply. The shear wave is more sensitive to the stress state of the confining pressure and the loading process. The damage analysis of the rock in the whole loading process was carried out and it is shown that，at different stages，the dynamic elastic modulus shows an increasing，stable or decreasing trend，and that the dynamic Poisson?s ratio reflects the expansion process of the rock. The study is helpful to understand the damage characteristics of rock mass under high confining pressure conditions and of great significance for the study of deep surrounding rock control，earthquake prediction and so on.
张 盛1，2，张旭龙1，王晓峰3，李 杰1，喻炳鑫1，王宏越1. 围压作用下花岗岩加载过程中波速变化规律试验研究[J]. 岩石力学与工程学报, 2019, 38(9): 1767-1775.
ZHANG Sheng1，2，ZHANG Xulong1，WANG Xiaofeng3，LI Jie1，YU Bingxin1，WANG Hongyue1. Experimental study on the variation of wave velocities of granite during loading process under a certain confining pressure. , 2019, 38(9): 1767-1775.
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2019, Vol. 38 
