Research on the development height of water conducting fracture zones in the 31301 working face of Jinjie Coal Mine
By utilizing theoretical analysis,numerical simulation,actual measurement of drilling leakage,and drilling observation,the failure law of the rock roof of the 31301 working face in Jinjie Coal Mine is identified.Based upon the calculation of theoretical and empirical formulas,the development height of the water conducting fracture zone is preliminarily predicted to be 30.6-49.6 meters.Using UDEC simulation software to simulate and analyze the propagation law of water conducting fractures during the mining process of the 31301 working face in Jinjie Coal Mine,the height of the water conducting fracture zone after mining in the 31301 working face is 52-55 meters,and using the drilling leakage observation method and drilling observation,the development height of the"two zones"of the rock roof in the 31301 working face is measured on site,it is found that the maximum height of the water conducting fracture zone after mining in the 31301 working face is 59.3 m,the split mining ratio is 19.1,and the maximum height of the collapse zone is 9.3 m,and the collapse mining ratio is 3.
water conducting crack zonetheoretical analysisnumerical simulationactual measurement of drilling leakagedrilling observationsplit mining ratio
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