INFLUENCE OF STRESS ON ELASTIC WAVE VELOCITY AROUND A BOREHOLE IN ROCKS
In this paper, we introduce acoustoelasticity theory to investigate wave-velocity distribution and polarization around a borehole in prestressed rocks to build their direct and explicit link macroscopically. The acoustoelasticity theory based on non-linear continuum mechanics invokes third-order elastic constants to explain the stress-induced wave-velocity change of rocks. The numerical results show that directions of the maximum and minimum wave-velocity change around a borehole correspond to those of the minimum and maximum far-field principal rock stresses, respectively. In order to validate the theoretical analysis, wave velocities around a borehole in sand stone under the biaxial loading are measured by pulse-echo method. The detail discussion shows that the experimental results coincide with the theoretical results, which means that the ultrasonic method based on acoustoelasticity theory could be a promising measurement method for in-situ rock stresses.
Acoustoelasticity In-situ stress Ultrasonic waves Rock Wave velocity
Jiayong TIAN Yuanpeng MAN Zhoumin XIE Hui QI
Institute of Crustal Dynamics,CEA,Subbox 28,Beijing P.O.Box 2855,Beijing,P.R.China,100085 Harbin Engineering University,Harbin,P.R.China,150001
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）