On the height of water flowing fractured zone in Shenjiawan coal mine

Based on the exploitation technical conditions,and the physical and mechanical parameters of rocks of 2666 caving face of Shenjiawan coal mine,the height of water flowing fractured zone calculation model is constructed.By using the rock failure process analysis software(RFPA2D),the deformation and falling of the overburden strata are simulated.And the height of water flowing fractured zone in overburden strata is checked by the theoretical formula in three-underground mining regulations and is measured with the upward slant hole observing method.The results show that the numerical simulation result,the theoretical calculation result and the site observation result are basically the same.This research can determine the height of water flowing fractured zone in overburden strata of Shenjiawan coal mine and also can provide the design basis for the similar coal mines.