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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摘要为获得深部岩石在遭受一定围压并持续受载状态下波速的变化规律，采用GCTS RTX–3000岩石力学试验机对花岗岩进行围压水平分别为40和80 MPa条件下的三轴压缩试验，得到相应的应力–应变曲线以及纵、横波速，结果表明：在围压增加过程中，花岗岩的纵、横波速随围压的增加而增大，呈二次函数关系；纵、横波速在三轴加载过程中均先急剧增加，然后趋于稳定，在开始萌生裂纹到发生破坏的阶段，波速先缓慢降低，之后急剧下降，其中，横波对围压及加载过程的应力状态更敏感；对花岗岩的整个加载过程进行损伤分析，动弹性模量在不同阶段呈现增加、稳定、下降的趋势，动泊松比能够反映岩石的膨胀扩容过程。该研究有助于理解高围压条件下岩石的损伤特征，对深部围岩控制及地震的预测等研究有重要的意义。

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	张盛1
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	张旭龙1
	王晓峰3
	李杰1
	喻炳鑫1
	王宏越1

关键词 ：岩石力学, 围压, 纵波, 横波, 三轴压缩, 损伤演化

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

引用本文:

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.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0246 或 http://www.rockmech.org/CN/Y2019/V38/I9/1767

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