Research and application of hydraulic fracturing and roof cutting pressure relief technology in dynamic pressure roadways
In response to the difficult problems of surrounding rock control brought by the characteristics of multiple dynamic pressure roadways,long service cycles,and multiple strong mining impacts during the service period in Jincheng mining area,the typical dynamic pressure roadway in Wangpo Coal Mine was used as the engineering background,and the causes of the deformation and damage of the surrounding rock of the reused roadway were analyzed through the field ground stress and the actual measurement of the surrounding rock strength,and the main force sources that induce the roadway deformation were analyzed to reveal the hydraulic fracture roof cutting and pressure relief to maintain the surrounding rock of the reused roadway.The mechanism of hydraulic fracturing and roof cutting pres-sure relief to maintain the stability of the surrounding rock of the reused roadway was revealed.A reasonable fracturing layer height and related parameters were determined using theoretical calculations,and a hydraulic fracturing pressure relief technology scheme was de-veloped,which was successfully applied in downhole experiments.The on-site application results show that hydraulic fracturing effective-ly shortens the overhanging of the working face,reduces the cycle pressure step distance,and reduces the dynamic pressure coefficient during pressure,and significantly reduces the roof pressure on the support.The displacement of the roof in the fracturing section of the roadway has decreased by 55.7％,and the range of mining influence has significantly decreased.Hydraulic fracturing can greatly reduce the convergence amount and convergence speed of the surrounding rock in the reused roadway,while forming a stress buffer zone in the far field,alleviating the high stress state of the reused roadway and achieving a good pressure relief effect,which can maintain the rela-tive stability of the surrounding rock of the tunnel.
万方数据
维普
