Study on permeability variation and groundwater response under disturbance of deep coal seam mining
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Abstract:
There is a lack of research on groundwater disturbance caused by deep coal resource exploitation in western China. Based on the elastic-plastic theory , this paper studies the variation mechanism of the seepage capacity of the overlying strata and the response of the groundwater by using the fluid solid coupling numerical simulation software COMSOL. The simulation results showed that the change pattern of overburden permeability is different in different mining stress states. The overburden permeability increased in the tensile stress zone: at the top of the excavation space it increased by 26% , and in the surface subsidence basin it increased by 3% . The overburden permeability decreased in the stress compression zone: on both sides of the coal pillar it decreased by 43% , and at about 300m above the mining space it decreased by 18% . A groundwater drawdown funnel was formed with the water-flowing fractured zone as the center. As a result, the vertical hydraulic gradient and flow velocity of groundwater both increased significantly, while the water pressure was basically in the original state at about 300m above the mining space. The research results can provide theoretical support for reasonable exploitation of coal resources and scientific management of water resources in the arid area of China.
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