Hydraulic fracturing and top cutting pressure relief effect of Yuwu Coal Industry's return air passage based on FLAC3D
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 hy-draulic 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.
万方数据
