深部构造地应力对巷道稳定性影响研究

Study of the influence of deep ground stress on roadway stability

为了解决深部巷道围岩稳定性问题,研究了深部构造地应力对巷道围岩稳定性的影响。采用套孔应力解除法对锦丰金矿深部地应力进行了实测,结果显示:其应力场属于构造应力场类型,最大水平主应力与垂直地应力比值达到1. 5。基于地应力分布特征,采用Rocscience公司开发的Phase2软件进行数值模拟和现场观测等,研究了构造应力对巷道稳定性的影响。研究结果表明:巷道未加固时,巷道最大位移处位于巷道两帮和底板中央处,最大位移量为0. 14 m,巷道塑性剪切破坏区半径为1. 5 m;采用Phase2软件进行支护参数优化,确定最终支护方式和参数。该研究结果对矿山深部巷道支护提供了一定的理论依据。

In order to solve the stability problem of deep roadway surrounding rock, the influence of deep ground stress on the stability of roadway surrounding rock was studied. The deep ground stress of Jinfeng Gold Mine is measured by overcoring stress relief method. The result shows that its stress field belongs to tectonic stress field, and the ratio of maximum horizontal principal stress to vertical ground stress is up to 1.5. Based on the characteristics of ground stress distribution, the method of numerical simulation and field observation using Phase2 software developed by Roc- science company was adopted to study the influence of structural stress, fault and buried depth of roadway on roadway stability. The -sults show that when the roadway is not -inforced, the maximum displacement of roadway is at the middle of roadway and floor. The maximum displacement is 0.14 m and the radius of the roadway plastic shear failure zone is 1.5 m. Phase2 was used to optimize the supporting parameters, and the final supporting methods and parameters were determined. The research results provided certain theoretical basis for supporting the deep roadway in the mine.