白音呼布矿区三维地应力测量及巷道布置优化研究

白音呼布矿区进入深部开采后,巷道岩爆、变形等地压灾害变得愈发严重。为保障生产安全,现场采用空心包体应力解除法测量了对矿区7个测点三维地应力,基于测量结果及地应力场构建对矿区深部巷道布置优化进行了研究。首先根据等应力轴比理论优化了巷道布置方向,给出了100m中段巷道轴向与最大水平主应力方向最优夹角为26°;然后采用数值模拟方法研究不同夹角时巷道围岩的应力、位移变化特征,并指导了新中段的巷道布置。结果表明:实测最大水平主应力是自重应力的1.57～1.89倍,矿区深部以水平构造应力为主导;夹角为26°时,巷道围岩变形最小,数值模拟与理论计算结果相符;新中段巷道优化布置后,围岩变形、位移明显变小,地压灾害得到有效控制。

Study on three-dimensional in-situ stress measurement and roadway layout optimization in Baiyinhubu mining area

After the deep mining in Baiyinhubu mining area, rock burst, deformation and other ground pressure disasters become more and more serious. In order to ensure the safety of production, the three-dimensional in-situ stress of 7 measuring points in the mining area was measured by the hollow inclusion stress relief method, and the optimization of deep roadway layout in the mining area was studied based on the measured results and the construction of the in-situ stress field. Firstly, according to the theory of equal stress axial ratio, the layout direction of roadway was optimized, and the optimal included Angle between axial direction and maximum horizontal principal stress direction of roadway in the middle section of 100m was given as 26°. Then, numerical simulation method is used to study the stress and displacement variation characteristics of roadway surrounding rocks at different included angles. It also directed the layout of the roadway in the new middle section. The results show that the measured maximum horizontal principal stress is 1.57~1.89 times of the dead weight stress, and the horizontal tectonic stress is dominant in the depth of the mining area. When the included Angle is 26°, the deformation of roadway surrounding rock is the smallest, and the numerical simulation is consistent with the theoretical calculation results. After the optimized layout of the roadway in the new middle section, the deformation and displacement of the surrounding rock decreased obviously, and the disaster of ground pressure was effectively controlled.