韩家湾煤矿房柱式采空区下近距离煤层开采顶板垮落灾害研究
[Abstract]:Roof disaster is one of the disasters easily caused in coal mine production. Especially for the geological conditions of shallow buried coal seam and thin bedrock in northwest area, when the fully mechanized coal face in close distance coal seam is arranged under the roof pillar goaf, The roof of working face is prone to collapse disaster in large area, which has a great influence on its safe mining. Therefore, it is of great practical significance to carry out a systematic study on roof caving disaster of coal seam mining in the close-distance coal seam under the roof pillar goaf, which is of great practical significance to promote the development of coal resources in mines with similar geological conditions in Northwest China. Based on the 3301 fully mechanized coal mining face of Hanjiawan Coal Mine in Yushenfu Mining area of North Shaanxi Province, this paper uses the research methods of theoretical analysis, numerical simulation and engineering verification to study the stability of the roof pillar goaf. This paper discusses and analyzes the roof fracture pattern of short distance coal seam mining under the roof pillar goaf and the overburden movement law and the characteristics of rock pressure after pillar blasting in the goaf. Based on nonlinear theory and numerical simulation, the stability of overlying pillar goaf in 3301 face of Hanjiawan Coal Mine is evaluated. The double key layer model of 3301 face in Hanjiawan Coal Mine is constructed, and the roof fracture mechanics analysis of 3301 face is carried out, and the discriminant condition of 3301 face roof instability is obtained. The numerical calculation models of coal pillar blasting in the upper roof pillar goaf of 3301 working face and the mining face under unblasting are established respectively, and the characteristics of overlying rock movement in the mining process of the working face are reproduced. The above analysis results have been verified in the mining practice of 3301 face in Hanjiawan Coal Mine, which provides an example for solving the safety problems that will be encountered in fully-mechanized coal seam under the overlying roof pillar goaf in Yushenfu mining area.
【学位授予单位】:西安科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TD327.2
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