围压作用下花岗岩加载过程中波速变化规律试验研究

doi:10.13722/j.cnki.jrme.2019.0246

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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.

Key words： rock mechanics confining pressure compression wave shear wave triaxial compression damage evolution

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	Articles by authors
	ZHANG Sheng1
	2
	ZHANG Xulong1
	WANG Xiaofeng3
	LI Jie1
	YU Bingxin1
	WANG Hongyue1

Cite this article:

ZHANG Sheng1,2,ZHANG Xulong1, et al. Experimental study on the variation of wave velocities of granite during loading process under a certain confining pressure[J]. , 2019, 38(9): 1767-1775.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0246 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I9/1767

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