动压巷道水力压裂切顶卸压技术研究与应用  

Research and application of hydraulic fracturing and roof cutting pressure relief technology in dynamic pressure roadways

作　　者：邢菲菲 李海宏 李明 Xing Feifei;Li Haihong;Li Ming(Shanxi Tiandi Wangpo Coal Industry Co.,Ltd.,Jincheng 048000,China;China Coal Science and Technology Group Co.,Ltd.,Beijing 100013,China;CCTEG Coal Mining Research Institute,Beijing 100013,China)

机构地区：[1]山西天地王坡煤业有限公司,山西晋城048000 [2]中国煤炭科工集团有限公司,北京100013 [3]中煤科工开采研究院有限公司,北京100013

出　　处：《能源与环保》2024年第2期248-255,共8页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

摘　　要：针对晋城矿区动压巷道多、服务周期长、服务期间受多次强烈采动影响等特点带来的围岩控制难题,以王坡煤矿典型动压巷道为工程背景,通过现场地应力与围岩强度实测,分析了复用巷道围岩变形破坏的原因,通过分析诱发巷道围岩变形的主要力源,揭示了水力压裂切顶卸压维护复用巷道围岩稳定的作用机理。利用理论计算确定了合理压裂层位高度及相关参数,制定了水力压裂卸压技术方案,并成功应用于井下试验。现场应用效果表明,水力压裂卸压技术有效缩短了工作面悬顶、降低周期来压步距,同时减小来压时动压系数;显著降低了支架所受顶板压力。压裂段巷道顶板移近量减少了55.7%,采动影响范围明显减小,水力压裂能够极大减小复用巷道围岩的收敛量与收敛速度的同时在远场上形成了应力缓冲区,缓解了复用巷道的高应力状态,起到了良好的卸压效果,维护了巷道围岩的相对稳定。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 pressure 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 developed,which was successfully applied in downhole experiments.The on-site application results show that hydraulic fracturing effectively 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 relative stability of the surrounding rock of the tunnel.

关 键 词：动压巷道 水力压裂 卸压机理 复用巷道 卸压效果 

分 类 号：TD322[矿业工程—矿井建设]