煤矿坚硬顶板工作面两次动压控制研究

Twice Dynamic Pressure Control of Working Face with Hard Roof in Coal Mines

为了减小沿空巷道顶板变形,通过理论分析结合数值模拟对两次采动下巷道围岩变形及应力分布情况进行了分析,发现在两次采动过程中,沿空巷道的两帮应力分布受到较大的影响,同时第二次采动下顶板的下沉量由184.7 mm升高至734.7 mm,巷道的底鼓量由64.8 mm增大至171.0 mm,巷道围岩变形明显增大。在数值模拟的基础上,给出了巷道围岩薄弱环节的补强支护方案,为沿空巷道围岩控制提供了参考。

In order to reduce the roof deformation of gob side retained roadway,this paper analyzed the surrounding rock deformation and stress distribution of roadway under two mining movements through theoretical analysis and numerical simulation.It was found that the stress distribution of two sides of gob side retained roadway was greatly affected in the process of two mining movements,the roof subsidence under secondary mining increased from 184.7 mm to 734.7 mm,the floor heave of the roadway increased from 64.8 mm to 171.0 mm,and the deformation of the surrounding rock of the roadway increased obviously.Based on the numerical simulation,this paper proposed the reinforcement support scheme of the weak link of the surrounding rock of the roadway,which can provide reference for the surrounding rock control of the gob side retained roadway.