软弱夹层倾角对巷道围岩稳定性的影响

The Influence of the Dip Angle of Weak Inter-layer on the Stability of Roadway Surrounding Rock

为研究软弱夹层的倾角对巷道围岩稳定性的影响,通过相似原理配制了含不同倾角软弱夹层的物理模型,利用模具对其施加位移边界条件,试验机对其施加垂直载荷,模拟地应力,对物理模型进行模拟开挖。结果表明:含不同倾角软弱夹层的巷道顶部均出现应力集中,呈现塑性变形并最终局部出现冒顶现象。巷道围岩的稳定性和软弱夹层的倾角有一定的关系,软弱夹层的角度越大,夹层和主岩体的结构面越容易发生滑移,整个巷道围岩的稳定性越差。可见软弱夹层的倾角严重影响巷道围岩的稳定性。

In order to study the influence of dip angle of weak inter-layer on the stability of surrounding rock of roadway,a physical model with different dip angle of weak inter-layer was prepared by similarity principle,Using the displacement boundary conditions imposed by the die,the test machine imposes vertical loads on it,simulates the in-situ stress,and simulates the excavation of the physical model.The results show that stress concentration occurs at the top of roadways with weak inter-beds with different dip angles,showing plastic deformation and eventually local roof fall phenomenon;The stability of roadway surrounding rock has a certain relationship with the dip angle of weak inter-beds.The larger the angle of weak interbeds,the easier the structural planes of inter-beds and main rock mass slip,and the worse the stability of the whole roadway surrounding rock.It can be seen that the dip angle of weak interlayer seriously affects the stability of surrounding rock of roadway.