Abstract
In view of the severe ground pressure behavior and spontaneous combustion risk of goaf in fully mechanized top coal caving face with deep buried weak cohesive roof and thick coal seam prone to spontaneous combustion, combined with theoretical analysis of mining overburden structure and field engineering practice, the structural characteristics of overburden rock and strata pressure behavior law are studied. The results show that: the deep buried thick coal seam fully mechanized top coal caving stope also has the phenomenon of surface step subsidence. Compared with the shallow coal seam, the surface subsidence is relatively slow, and the weak adhesion of the roof leads to the short periodic weighting step distance of the stope, and the average step distance is 9.9m. The measured peak value of advance abutment pressure is 7~10.5m in front of coal wall. According to the mine pressure control and fire prevention demand of goaf, the reasonable advancing speed is 4~5m/d.
Highlights
Zhungeer coalfield is located in Ordos Plateau, Inner Mongolia Autonomous Region
Most of the mining areas in the area belong to low gas mines, with large mining thickness, low gas content, easy spontaneous combustion and high CO content
In the mining process of underground mining in the area, there is a phenomenon of severe ground pressure, and the working resistance of the support is generally large, which is prone to the problems of coal wall spalling, roof fall and support crushing
Summary
Zhungeer coalfield is located in Ordos Plateau, Inner Mongolia Autonomous Region. The overall trend of terrain in the coalfield is high in the West and low in the East, and the surface is covered by loess layer. In the mining process of underground mining in the area, there is a phenomenon of severe ground pressure, and the working resistance of the support is generally large, which is prone to the problems of coal wall spalling, roof fall and support crushing. The burial depth of F61101 working face of the first mining face is more than 500m, which has the characteristics of severe ground pressure behavior and spontaneous combustion in goaf, and large buried depth of coal seam. In order to improve the safety and efficiency of mining, and provide scientific basis for similar working face mining, taking F61101 working face as the research object, according to the periodic weighting characteristics and basic roof weighting step distance of working face, the safe advancing speed which is conducive to mine pressure control and natural inhibition of goaf is studied, which provides guidance for safe mining of working face
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