宣东二号煤矿地应力测量及分布规律研究

 采用应力解除法，对宣东二号煤矿砂岩和辉绿岩两个岩层中进行三维地应力测试，并对获得的含有应变计的套孔岩芯进行了室内围压率定试验。结果表明：各个主应力均为压应力，没有出现拉应力的现象；矿区以水平构造应力为主，最大水平主应力的值在64.93～73.61MPa范围内变化，方向基本上为SW-NE，竖向主应力接近上覆岩体的自重应力；各测点的最大剪应力较大，其值均大于20MPa。测量结果为矿井采场合理布局、巷道布置选择和锚杆支护设计提供可靠依据。

In-situ Stress Measurement and Distribution Law of Xuandong No.2 Coal Mine

A three-dimensional stress test was conducted in diabase and sandstone terrane of Xuandong No.2 Coal Mine, and rock cores with strain gauge obtained was implemented confining pressure calibration test. The results indicate that each of the principal stresses is compression stress, and no tensile stress is found; The in-situ stress field of the Coal Mine is mainly composed of horizontal tectonic stress, the value of maximum principal stresses range from 64.93MPa to 73.61MPa, and their orientation was about SW-NE, the value of vertical principal stresses are close to the weight of top strata in unit area; The value of maximum shear stress at each point are greater, which is more than 20MPa. The results supply a reliable basis for mining stope proper redistribution, roadway disposal and anchor support design.