Hydraulic Fracturing Technology for High-level Roof Rock Stratum in the Western Coal Seams of Dafosi Mine
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.
main roadway groupbottom bulgehydraulic fracturingimpact range
万方数据
维普
