| Mine water bursting hazard is largely threaten the seam by the wide range in our country,many incidents of sudden water surface sand accidents take place in recent years, not only economic losses, but also destroyed the ecological environment in mining areas, with serious social harm. So, this paper is based on the results of previous studies, take Wanbei Coal Corporation BAISHAN coal52mining area mining fractured bottom water content and Huainan Mining Group PANBEI mine borehole dewatering Limestone water as the background, with the method of theoretical analysis, laboratory testing and numerical simulation, focused on the characteristics of the dynamic evolution of hydrophobic buck variable water pressure mining seepage. After hydrophobic buck, the coal mining area of influence is gradually decreased, and the aquifer seepage velocity is also reduced.This study can improve the level of mining technology, has an important theoretical significance and practical value in evaluate engineering safety, promote of coal mine production safety, achieve green mining of coal resources and the sustainable development of the coal industry, and has very broad application prospects.This paper introduces the current research status of seepage at home and abroad, analysis of the seepage flow of the solid coupling mechanism of the development detailed, and come up with the control techniques control of water extraction mine; extensively collected and collated of the drilling data and mine geology reports. Combined with the physical and mechanical properties of rock experiment, the X-ray diffraction experiments, electron microscopy and scanning experiment, we use software FLAC3D to build the model of fluid-structure interaction, analyzed of the development pattern of change mining seepage water pressure, analyzed the mining law of evolution characteristics of rock mass strain, stress, failure mechanism, the pore water pressure and seepage flow rate of change in water pressure under the background of working conditions.Select52mining area with a typical geological conditions of the BAISHAN coal in HUAIBEI, use the software FLAC3D to establish the model for simulation of the fluid-structure interaction on the condition of mining fissures drainage water changes in water pressure situation, to simulate the water pressure in the1MPa,0.5MPa, 0.25MPa, coal seam40m,80m,120m,160m, analyzed the displacement, stress, plastic zone, pore water pressure and seepage vector; After drainage of water pressure in the fractured aquifer rock roof, the impact of the roof the extent of damage reduced correspondingly.Select the PANBEI coal mine geological conditions in HUAINAN, use FLAC3D to establish the typical fault-containing model for simulated fluid-solid coupling on the condition of the water pressure changes under the water Lane Drainage hydrophobic buck, to simulate the water pressure in the5MPa,4MPa,3MPa, coal seam42.26m,84.52m,126.78m,169.04m respectively, analyzed the displacement, stress, plastic zone, pore water pressure, seepage vector. After hydrophobic drainage the confining rock,the effect of floor failure range is reduced correspondingly.In the same water pressure, with the excavation of the expansion of the scale, the maximum displacement, the maximum vertical stress, excavation of the plastic zone were tested gradually increased an increasing trend. Pore water pressure tends to decrease for the first time mining seepage maximum velocity decreasing after mining. This study enriched the subsea mining technology further。... |
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