| In this paper, the influence of water pressure and mining thick ness and mining advancedista nce on the height of fracture region induced by coal-mining were studied by mea ns oftheoretica l analysis, and numerica l simulation based on the geological and cavity data fromYulin loca l coal mining area, so as to rationa lly utilize coal resources, prevent and controlgeological disasters, protect groundwater resources, and contribute to the harmoniousdevelopment of resources, environment and economy.In this paper, RFPA-flow numerica l simulation software was used to simulate therelationship between mining strength and the height of fracture region taking into accountaquifer water pressure. According to the simulation results, we derived the ma ximum fractureregion height expecting formula which suit for the study area.According to the mining working face footage at the full mining time, we used theexpected formula to calculate the ma ximum height of fracture region in study area. Then wecompared the calculate result to the dista nce between the aquifer and the coal seam anddivided the study area into two regions: region I - water-persevered-mining area, this area ofthe coal mining could be a norma l; Region II - coal water loss area, this area will be lead tothe destruction of aquifers, coal mining under water can not be achieved. In order to achievethe full utilization of coal resources and the protection of precious water resources, this paperputs forward measures for water protection–Stratified of mining and limited area of mining.The expected results by the formula were compared with the actual situation ofproduction enterprise, which have the higher accuracy, better reliability, and be of somereference value. The two kinds of water-persevered-mining methods suggested by this paperhave certain significa nce for the water-persevered-mining purpose in the study area. |
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