Abstract
Aiming at the wide range of rock strata movement and collapse, poor stability and high damage rate of the working face support and being prone to crushing of the support in large mining height face, analog simulation, theoretical analysis, and field measurements have been carried out to analyze roof breaking structure form and calculation method of support reasonable support resistance of large mining height face. The researches show that, affected by the space of the mined-out area, the roof of the large mining height working face will take on the structural form of “combined suspended beam-nonhinged roof-hinged roof”; the interaction system between the support and the surrounding rock consists of “hinged roof structure,” “nonhingeable roof structure,” “combined suspension beam structure,” and the support. The support resistance should adapt to the change of the overlying rock structure’s instability movement, bearing the weight of the structure itself and the additional load generated by the movement. Combining with the mining conditions of Jinhuagong Coal Mine’s large mining height face in Datong mining area, the reasonable support resistance of the working face support is analyzed. The mine pressure monitoring shows that the ZZ13000/28/60 type support and shield hydraulic support can meet the requirements of roof control; the research results ensure the safe mining of the large mining height face.
Highlights
Combining with the mining conditions of Jinhuagong Coal Mine’s large mining height face in Datong mining area, the reasonable support resistance of the working face support is analyzed. e mine pressure monitoring shows that the ZZ13000/28/60 type support and shield hydraulic support can meet the requirements of roof control; the research results ensure the safe mining of the large mining height face
Jinhuagong Coal Mine is one of the large scale mine areas owned by Datong Coal Mine Group in China which locates at 12.5 km to the west of Datong City. e area of mine is 41 km2, the Geofluids designed production capacity is 4.5 Mt/a, and the average excavating depth of coal strata is 5.7 m. e lithological character of the roofing is mainly sandy strata with high hardness
Based on the results of physical test and numerical analysis, a mechanical model is established to analyze the interaction between support and surrounding rock under this mining condition, and the calculation method of reasonable support resistance under large mining height is deduced to guide the reasonable selection of support and roof control under large mining height. e correctness of the calculation method is verified by engineering practice
Summary
In order to evaluate the characteristics of movement and structural mode of overlying rock roofing in large mining height condition, No 8218 large mining height working face of Jinhuagong Coal Mine was selected as background to conduct physical similar simulation experiment
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