裂隙较发育岩体的地应力测量与研究  

Measurement and Research on In-situ Stress of Jointed and Fractured Rock Mass

作　　者：刘元坤[1] 石安池 韩晓玉[1] 许静[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《长江科学院院报》2017年第12期63-67,72,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51579016);国家重点研发计划项目(2016YFC0401801;2016YFC0401803);中央级公益性科研院所基本科研业务费项目(CKSF2016041/YT;CKSF2017037/YT)

摘　　要：为了解决裂隙较发育岩体在常规地应力测试方法下难度较大、成功率较低的问题,分析研究了各种地应力测试方法在裂隙较发育岩体中的适用性。结果表明:钻孔孔底应变解除法可用于节理裂隙较为发育岩体的地应力测量,并在某水电站坝基柱状节理岩体中得到应用;采用该方法成功获得某水电站坝基柱状节理岩体的平面应力状态,并对3个不同方位的钻孔测试获得三维应力状态;通过坐标转换至各个钻孔坐标系下的应力结果与单孔孔底应力测试结果较为接近,不同方法的测试结果得到互相验证。故钻孔孔底应变解除法能较好地适用于诸如柱状节理等裂隙较发育岩体的地应力测量与研究之中,可供类似工程参考使用。In order to address the difficulty and low success rate of conventional stress detection methods applied to jointed and fractured rock mass,we found that the method of strain relieving in the bottom of borehole is applicable and we employed this method to the columnar jointed rock mass of the dam foundation of a hydropower station.Through this method,we obtained the plane stress of the jointed rock mass and the three-dimensional stress state from three boreholes in different directions. The stress results transformed to the borehole coordinate system were close to the test results of single borehole stress,verifying the calculation results. In conclusion,the method of strain relieving in the bottom of borehole could be well applied to the stress measurement of fractured rock mass such as columnar joints.

关 键 词：水电站 节理岩体 地应力 孔底应变解除法 三维应力状态 

分 类 号：TV223[水利工程—水工结构工程]