围压条件下岩石kaiser效应测量地应力试验

Experimental Test for Geostress by Accepting the kaiser Effect under Confining Pressure Conditions

基于岩石kaiser效应,提出了通过岩石在三轴压缩条件下的声发射试验,对取样点岩石地应力进行室内测量的方法,同时对试验结果采取应力记忆和应变记忆分析法进行分析计算,分别获得岩样的主应力大小和水平投影角。试验结果表明,利用围压条件下的岩石声发射试验进行地应力测量的方法可行,与现场测量方法相比更为经济、简单易行,其结果与通常采用的单轴压缩条件下的结果相比更为精确,并证实了采用应变记忆分析法比应力记忆分析法所得结果更为合理。

Geostress is the origin stress which causes the deformation and damage of rock slope and underground engineering,it can be obtained only by measuring. Based on the kaiser effect,a method that the geostress of rock was measured in lab by employing the acoustic emission test under tri-axial compression was proposed. Meanwhile,the test results were analyzed and calculated by using stress and strain memory methods,and the principal stress and horizontal projection angle of rock were obtained,respectively. The results show that the geostress measurement by the acoustic emission test with the confining pressure is feasible and reliable,and it is simpler,more economic,and more feasible compared with the field measurement method,its results are more accurate compared with the common condition of uniaxial compression. Also,the test results indicate that strain memory analysis is much more reasonable than stress memory analysis.