The Influence of Mining Height on the Height of Water Flowing Fractured Zone

摘要

Under the background of the hydrogeology conditions of the first working face of 11 coal seam in LuXin coal mine, theoretical formula prediction and numerical simulation were used to research the influence of mining height on the growth altitude of water flowing fractured zone. According to the requirement of the minimum thickness of waterproof coal pillars, the reasonable mining height was confirmed to be 3m. It was proved by similar material simulation that the maximum height of water flowing fractured zone was about 39.5m when the mining height is 3m, which was consistent with results of numerical simulation, and the thickness of protective layer was 23.5m, which ensured the safety of mining.