地下洞室围岩三维应力测试实例

介绍某电站全地下式厂房地下洞室现场测试情况及资料整理计算方法 ,结合地质情况综合分析了测试部位岩体的应力变化 ,定性评价了地下洞室测试部位现阶段围岩的三维应力状态 ,提出了原位应力测试中应注意的一些问题 .

Stress Tests of Surrounding Rock Mass in Substratum Cavity

Stress relaxation (i.e.rock burst) occurs during excavation due to the high initial stresses of the surrounding rock mass in the power house area.In order to find out the degrees of stress changes and stress redistribution after excavation,some in situ stress tests have been carried out on the basis of strain release technology.This paper presents the in situ testing procedure and the method of data processing.Based on the geologic conditions and the rock mass characteristics,a synthetic analysis of the local rock mass stress changes in the testing parts and a qualitative assessment of the three dimensional stress states in the local surrounding rock mass of the testing parts of the underground cavity are made.Meanwhile,some problems are pointed out which may occur during in situ stress tests.