不同应力解除法地应力测试方法对比及工程应用

介绍了钻孔空心包体式应变计与孔壁切缝解除法地应力测试的基本原理和测试方法,同时对两种应力解除地应力测试方法的适用性进行对比分析。将两种应力解除法应用于锦屏一级导流洞边墙的地应力测试中,并就同一钻孔进行了对比测试。通过对测试结果的对比分析可知,两种方法的测试结果相符,应力量值误差均小于20%,钻孔横截面最大主应力方位误差也在20°以内。鉴于孔壁切缝解除法地应力测试方法可用于极高应力条件下的应力测量,对于西部的深埋高-极高应力条件下的地下工程来说,该方法非常行之有效。

Comparison of different stress relieving methods and application in geo-stress measuring

We introduce basic principles and measuring procedures of two geo-stress measuring methods, the hollow package triaxial gauges and the borehole slotter. Meanwhile, comparative analysis of the applicability of two relieving stress testing methods was carried out. The two different stress relieving methods were applied to the in-situ stress test of the side wall in the diversion tunnel of Jinping-I hydropower plant, and comparative tests were carried out in the same borehole. The measuring results of both methods were consistent. The stress value error was less than 20%, and the maximum principal stress of cross section drilling azimuth error was 20 degrees. So the borehole slotter method can be used for high stress measurement of underground projects in western China that usually encounters the conditions such as deep buried tunnels and high or extremely high stress conditions.