裂隙较发育岩体的地应力测量与研究

发布时间：2018-12-08 10:37

【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。
[Abstract]:In order to solve the problem of high difficulty and low success rate in conventional in-situ stress measurement, the applicability of various in-situ stress measurement methods in fractured relatively developed rock mass is analyzed and studied. The results show that the method of borehole bottom strain release can be used to measure the in-situ stress of the jointed rock mass, and can be applied to the columnar jointed rock mass of the dam foundation of a hydropower station. The plane stress state of the columnar jointed rock mass of the dam foundation of a hydropower station is successfully obtained by using this method, and the three dimensional stress state is obtained by testing three different directions of boreholes. The results of the stress transformation from the coordinate system to the coordinate system of each borehole are close to the results of the single hole bottom stress test, and the results of the different methods are verified by each other. Therefore, the method of borehole bottom strain relief can be used to measure and study the in-situ stress of fractured rock mass, such as columnar joints, which can be used as a reference for similar projects.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;中国电建集团华东勘测设计研究院有限公司;
【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)
【分类号】：TV223

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