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Abstract In order to reveal the failure morphology and mine pressure behavior of each overburden strata during shallow buried close multi-coal seam mining, this research takes the Shenmu Zhangjiamao mining area as the engineering background, the migration characteristics of shallow buried close-range overburden structure and the distribution law of mine pressure were studied. The results show that: with the gradual mining of 2− 2 coal seam, the front-rear supporting pressure of the unmined coal seam increases first and then decreases, and the compaction strength of the collapsed overburden in the middle of the mined-out area increases gradually. With the mining of 2− 3 coal seams, the displacement of the direct roof of the lower mined-out area and the rock layer of the upper compaction area increases gradually. The peak stress of the concentrated stress area on both sides of the 2− 3 coal seam gradually decreases with the increase of layer spacing. The compaction stress of overburden in the upper goaf decreases gradually, and the peak value of compaction stress in the middle of the lower goaf increases gradually. Through the measured results of the borehole stress sensor, the obvious influence range of the advance support pressure is about 40 m.
Hu et al. (Thu,) studied this question.