Study Of The Mining Rock Strata Movement Under T-2 Burning Area Of Zaoquan Coal Mine

Ningdong is one of the 13 coal bases of 100 Mt in china. The main production areas of Ningdong coal base are mainly in the No.2 coal seam of Ningwu coal field. The shallow area of No.2 coal seam has burning area, and the burning area contains plenty hydrops, which affects the safety production of the coal mine significantly. It is very important for the field production and the construction of intrinsically safe type mine to study the burning area and the rock strata movement under the burning area.In this thesis, based on the engineering geological conditions of the 12104 and 12206 mining face of Zaoquan Coal Mine of Shenghua Ningxia Coal Group, and the T-2 burning area above the mining face, the burning area and the overburden movement, deformation and subsidence induced by mining of the mining face under the burning area are studied with field investigation, similar material simulation experiment,theoretical analysis and numerical simulation.The study shows that, the mining of 12104 mining face will not be influenced by T-2 burning area, but the crack zone will develop to the surface. In the mining process of 12206 mining face, the cracks in the overburden will guide circuit with 12104 goaf area. The cracks will also appear between the bedrock and top soil layer, and they will guide circuit with T-2 burning area, and then develop to the surface. The T-2 burning area has potential safety trouble for the mining of the 12206 mining face, and it is essential to survey water during drilling and mining. After the mining of the 12104 and 12206 mining face, the subsidence of the surface look like a basin, and the influencing area will extend as the increasing of the mining height. The overburden movement of the lower area of bed rock is slow, and the overburden movement of the upper area of bed rock is quickly. According to the study results and field practice, the survey water method during drilling and mining is designed.