巷道围岩变形空间演化规律研究

Research on the Spatial Evolution Law of Deformation of Surrounding Rock in Tunnels

为了保证井下开采安全、提升巷道稳定性,利用数值模拟软件对巷道围岩位移时空变化情况进行研究,发现在工作面开采至一定距离后,巷道围岩顶底板移近量可以分为3个阶段,分别为稳定阶段、增加阶段、反向增加阶段。同时顶板下沉曲线呈“S”形,开始阶段下沉速度逐步增大,后经过活跃阶段下沉速度快速增大,在衰退阶段下沉速度先增后减,然后逐步趋于平稳状态。最后对不同开采速度下的巷道垂直位移进行分析,发现开采速度越快,巷道顶板变形量越小,对巷道稳定性的保持就越有利。

In order to ensure the safety of underground mining and improve the stability of tunnels,numerical simulation software was used to study the spatiotemporal changes of tunnel surrounding rock displacement.It was found that after mining to a certain distance,the displacement of the roof and floor of the tunnel surrounding rock can be divided into three stages:stable stage,increasing stage,and reverse increasing stage.At the same time,the sinking curve of the roof shows an"S"shape.In the initial stage,the sinking speed gradually increases,and then in the active stage,the sinking speed increases rapidly.In the decline stage,the sinking speed first increases and then decreases,and then gradually tends to a stable state.Finally,the vertical displacement of the roadway under different mining speeds was analyzed,and it was found that the faster the mining speed,the smaller the deformation of the roadway roof,which is more beneficial for maintaining the stability of the roadway.