原岩应力现场与实验室测试对比研究

Comparative Study of In-situ and Laboratory Tests of Rock Stress

为验证利用声发射Kaiser效应法测量原岩应力的可靠性和准确性,对杉木树矿S30+96石门分别采用现场空心包体应变法和实验室声发射Kaiser效应法测量其地应力,最后对比分析了2种测试方法的结果。根据测量结果可知,利用声发射Kaiser效应法与空心包体应变法测得的原岩应力值相对误差分别为最大主应力3.59%、中间主应力10.79%、最小主应力11.04%,2种测试方法所得的结果相对误差较小。此外,现场和实验室得到的3个主应力方向也基本一致。研究结果表明,实验室利用声发射Kaiser效应法测量原岩应力具有较高的准确性,声发射Kaiser效应法测量原岩应力可很好地运用于工程实践。

In order to verify the reliability and accuracy of the measurement of original rock stress by using the acoustic emission Kaiser effect method in the laboratory,the in-situ hollow inclusion strain method and the laboratory acoustic emission Kaiser effect method were used to measure the ground stress of the S30+96 crosscut of the Shanmushu mine. Finally,the results of the two test methods are compared and analyzed. According to the measurement results, the relative errors of the original rock stress values measured by the acoustic emission Kaiser effect method and the hollow inclusion strain method are:3.59%(maximum principal stress),10.79%(intermediate principal stress) and 11.04%(minimum principal stress),the relative error of the results obtained by the two methods are quite small. In addition,the three principal stress directions obtained in the field and in the laboratory are the same. The results show that there is high accuracy of using the acoustic emission Kaiser effect method to measure the original rock stress in the laboratory. The acoustic emission Kaiser effect method can be used to measure the original rock stress efficiently.