摘要
针对大佛寺矿西部煤层大巷群顶部采空区和地质构造影响,西部煤层大巷7-8#联巷段出现顶帮浆皮开裂、收敛、底鼓等矿压显现,采取顶板岩层水力压裂技术.结果表明:顶板深孔水力压裂卸压机理为应力转移、应力均布化、浸润弱化作用;通过1#、2#、3#钻孔压裂过程中漏水点距离观测,确定本次西部大巷顶板压裂影响范围为27.65～53.66 m;巷道两帮峰值应力较卸压前降低2.09 MPa,其降幅达到8.58％,4上煤、4煤巷道帮部弹性能降幅分别达到12.85％、5.51％.
Abstract
Aiming at the influence of the top goaf and geological structure on the western coal seam main roadway group in Dafosi Mine,the 7-8# connecting roadway section of the western coal seam main roadway occurs mine pressure manifestations such as roof side slurry skin cracking,convergence,bottom bulge and so on.Therefore,hydraulic fracturing technology for roof rock stratum is adopted.The results show that the pressure relief mechanism of deep hole hydraulic fracturing in the roof is stress shift,stress homogenization,and infiltration weakening impact;through the observation of the distance between the water leakage points during the fracturing process of 1#,2#,and 3# broholes,it is determined that the impact range of the fracturing on the roof of the western main roadway is 27.65-53.66 m;the peak stress of the two sides of the roadway decreased by 2.09 MPa compared to before pressure relief,with a decrease of 8.58％.The elastic energy of the 4th upper and 4th coal roadway sides decreased by 12.85％and 5.51％,respectively.
维普
万方数据