大理岩声发射Kaiser效应法测量原岩应力试验研究

Experimental study on in-situ stress measurement from marble using acoustic emission method

为研究声发射Kaiser效应法测量原岩应力,进行了现场套孔应力解除试验,得到了试件加载方向的实测应力值,对大理岩进行单轴压缩条件下的2次加载声发射试验并确定Kaiser点.试验结果表明:通过声发射Kaiser效应法测得的地应力与通过套孔应力解除法测得的原岩应力误差小于10%,原岩应力位于20%~26%的峰值强度之间,即岩石压密阶段后期或弹性阶段初期.研究结果可为提高判读Kaiser点的精度和岩石工程实际提供依据.

On-site stress relief tests were performed to measure the in-situ stress by the technology of acoustic emission Kaiser effect. The measured stress value of the specimen loading direction was obtained. The acoustic emission test with secondary loading on the marble under the condition of uniaxial compression determines the Kaiser point. The experimental results show that the deviation between the geostress measured by acoustic emission Kaiser effect method and the raw rock stress measured by Sleeve stress relief method is lower than 10 %. The stress of the original rock is between 20 % and 26 % of the peak intensity, ie, the later stage of the rock compression stage or the initial stage of the elastic phase. The results provide favorable basis for improving the accuracy of the interpretation of Kaiser points and the actual engineering of rock engineering.