论文部分内容阅读
岩体中弱结构面的产状要素和力学参数是影响深部巷道围岩变形和破坏的重要因素。通过对金川矿区地下开采过程中发生的与弱结构面效应有关的巷道变形特征、破坏模式与机理分析得出,在断层附近或穿过断层开挖时,往往会引起断层活化,引发巷道变形和破坏。当在节理岩体中开挖时会使围岩中低强度的节理裂隙等弱结构面正应力减小,抗剪强度降低,从而发生相对滑移、变形。此外,与巷道开挖相比,矿体开采的影响不仅在持续时间上,还是在影响以及程度上都是造成巷道变形和破坏的弱结构面效应更加显著的主要原因。
The production factors and mechanical parameters of the weak structural plane in the rock mass are important factors that affect the deformation and failure of the surrounding rock in the deep tunnel. By analyzing the deformation characteristics, failure modes and mechanism of the roadway deformation in the process of underground mining in Jinchuan mining area, it is concluded that the fault activation and the deformation of the roadway are often caused near or through the fault excavation. damage. When excavating in jointed rock mass, the normal stress of weak jointed joints such as low-strength jointed fractures in surrounding rock decreases, and the shear strength decreases, so that relative slip and deformation occur. In addition, compared with roadway excavation, the influence of orebody mining is not only in the duration, but also in the influence and extent, which are the main reasons for the weak structural surface effect that causes the deformation and destruction of roadway.