水平应力对巷道围岩稳定性的影响

采用理论分析方法研究了巷道布置与地应力场的关系,利用数值模拟方法分析了不同巷道轴线与最大水平主应力夹角的情况下,巷道围岩应力分布与变形特征。指出随着夹角增大,水平应力分布从对称变为非对称,应力降低区与升高区也发生变化;当夹角增大到一定值,非对称性逐渐降低,到90°时又出现了对称分布;巷道变形在夹角20～70°变化明显。在山西潞安常村煤矿井下进行了地应力测量,分析了地应力对巷道变形与破坏状况的影响,验证了理论分析与数值模拟结果。

Analysis on affects of in-situ horizontal stress to stability of rock surrounding roadway

The relationships between roadway layout and in-situ stress fields were studied theoretically. The characteristics of stress and deformation distributions in roadway surrounding rock at different angle between the axial of roadway and maximum horizontal principal stress, were analyzed by means of numerical simulation. It was pointed out that the distribution of horizontal stress varies from symmetry to non-symmetry, and the stress decreasing and increasing zones also change with the angle increasing; the non-symmetry gradually decreases when the angle amounts to fixed value, and symmetry appears again when the angle equals to 90°; the roadway deformation change obviously when the angle is between 20° and 70°. The in-situ stress measurements were carried out in Changcun coal mine in Lu’an coal mining district, the affects of in-situ stresses to roadway deformation and damage were analyzed, and the results got from theoretical and numerical studies were verified.