軟巖工作面開采引起上覆巖層移動變形規(guī)律研究
[Abstract]:Protection layer mining and pressure-relief gas drainage are the preferred regional gas control measures at present. With the mining of the protective layer, the stress-strain state and the gas stress dynamic state of the protected coal seam will change. The elastic potential energy in the coal seam is released, the development of the fissure improves the permeability of the coal seam, the gas fluidity in the protected coal seam becomes larger, a large amount of gas desorbs out, thus the function of releasing the pressure is achieved, and the reasonable gas drainage measures are cooperated. The gas content and internal energy in coal seam can be reduced, and the purpose of preventing coal and gas outburst can be achieved. During the working face advance, the original stress balance of surrounding rock in stope is broken, and the overburden strata lose balance because of self-weight and stress action of other rock mass, thus the movement and deformation occur. The rock strata closest to the face produce the largest movement deformation and the largest degree of rock mass fragmentation, forming caving areas near the goaf, the cracks in the upper rock body of the caving area are developed, and the crisscross fissure network forms the fracture area in the rock body. The rock mass in the upper part of the fissure area keeps a good stability, and the subsidence is regular. Because there may be underground water in overlying strata, coal seams to be mined, various buildings on the surface, etc., can accurately judge the movement and deformation of overburden strata after stope pushing and its possible influence range, To the actual production and the formulation of safety measures have a great significance. In the absence of a suitable coal seam as a protective layer, a relatively reasonable rock face can be selected for mining. Combined with the actual production situation of soft rock mining in Luling Mine, this paper uses the method of similar simulation experiment to study the deformation of overlying rock caused by soft rock mining. The stress and displacement changes of overlying strata in the middle of the goaf are measured under different propulsive distances, and the experimental data are analyzed and sorted out. Based on the experimental results, the range of "three zones" of overburden movement and deformation is forecasted, and the effect of soft rock working face as the protective layer of upper coal seam is discussed. In order to understand the movement and deformation of overburden on the whole, this paper, combined with the method of numerical simulation, makes quantitative analysis of the factors which may cause the movement and deformation of overburden after mining in soft rock face. This paper analyzes the stress magnitude and displacement of the upper strata in the middle part of the goaf under the conditions of different propulsive distances, and judges the range of the "three zones" by using the magnitude and nature of the main stress acting on the rock mass. The effect of soft rock working face as the protective layer of upper coal seam is tested. The simulation results obtained by the two experimental methods are very useful for practical production.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TD325
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