岩石扩容过程中的体积应变与超声横波速度  

A study of the relationship between the volumetric strain and the ultrasonic S-wave velocities in dilatancy of rocks

作　　者：刘维国[1] 单钰铭[1] 傅荣华[2] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,成都610059 [2]成都理工大学环境与土木工程学院,成都610059

出　　处：《成都理工大学学报（自然科学版）》2006年第4期360-364,共5页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金资助项目(40472140)

摘　　要：通过对三轴实验中岩石体积应变与横波速度的分析,揭示了在各种试验环境中岩样的抗压强度大于体积应变最大值点的差应力,而体积应变最大值点的差应力大于横波速度最大值点的差应力,说明抗压强度前岩石扩容现象是肯定存在的。试验结果表明:不论应力应变曲线上的直线部分是否明显,都可以用检测横波速度最大值的办法确定岩石的应力门槛值;并建议对求岩石泊松比的常规方法有必要进行重新调整。Based on the triaxial tests, the relationship between the volumetric strain and the S-wave velocities in the dilatancy of different rocks is presented in the paper. The test results show that the stress value of the maximum volumetric strain is greater than the stress of the peak of the S-wave velocity but less than that of the compressive strength. Whatever the straight line part of the stressstrain curve may be, it is always possible to find out the rock stress threshold by the peak value of the S-wave velocity. The authors suggest that the method to calculate Poisson＇s ratio of rocks needs to be reconsidered.

关 键 词：岩石 扩容 应力门槛值 横波速度最大值 

分 类 号：TU458[建筑科学—岩土工程]