基于FLAC^(3D)的余吾煤业回风顺槽水力压裂切顶卸压效果研究

Hydraulic fracturing and top cutting pressure relief effect of Yuwu Coal Industry’s return air passage based on FLAC 3D

为探究水力压裂在煤矿顶板卸压中的应用效果,以余吾煤业S5207工作面为背景,利用FLAC^(3D)分别模拟有无采用水力压裂切顶卸压的开挖模型,对S5207回风顺槽围岩变形情况及围岩塑性区发育形态进行分析。研究结果表明,在水力压裂切顶卸压条件下S5207回风顺槽最大水平位移出现位置大体不变,水平位移最大值大幅减小;在进行水力压裂卸压后S5207回风顺槽顶底板最大竖向位移比无水力压裂切顶卸压条件下分别减小20%和47%;水力压裂卸压后S5206胶运顺槽与S5207回风顺槽之间岩体塑性屈服面积明显减小,有效保证了S5206胶运顺槽与S5207回风顺槽之间岩体的稳定性。

To explore the application effect of hydraulic fracturing in coal mine roof pressure relief,this article takes the S5207 working face of Yuwu Coal Industry as the background,and uses FLAC^(3D)to simulate excavation models with and without hydraulic fracturing for roof pressure relief.The deformation of the surrounding rock in the S5207 return air passage and the development form of the plastic zone of the surrounding rock are analyzed.The research results indicate that:Under the conditions of hydraulic fracturing and top cutting pressure relief,the maximum horizontal displacement of S5207 return air passage remains largely unchanged,and the maximum value of horizontal displacement significantly decreases.After hydraulic fracturing and pressure relief,the maximum vertical displacement of the roof and floor plates of the S5207 return air passage is reduced by 20%and 47%,respectively,compared to the conditions without hydraulic fracturing and top cutting pressure relief.After hydraulic fracturing and pressure relief,the plastic yield zone of the rock mass between the S5206 belt transport passage and the S5207 return air passage is significantly reduced,effectively ensuring the stability of the rock mass between the S5206 belt transport passage and the S5207 return air passage.