Abstract
In order to realize the safe and efficient mining of the short-distance isolated island working face under the deep goaf area, the 120502 isolated island working face of Liuzhuang Mine was taken as the engineering background. The method of combining numerical simulation and field measurement were used comprehensively to systematically simulate and study the spatial evolution of the stress field, plastic strain field, and fracture field of coal rock during the mining process. The leading support pressure and the vertical displacement of the roof in the overlapping section and noncoinciding section of the isolated working face and the goaf above were measured on site. The results are that the peak value of the advanced support pressure of the overlap section and the nonoverlapping section is 10 m before the coal wall of the working face; the advanced support pressure of the nonoverlapping section is 33.3 MPa, and the vertical displacement of the roof is 300 mm. The advanced support pressure and the vertical displacement of the roof in the noncoincidence section were significantly higher than those in the coincidence section of 18.2 MPa and 210 mm. The results are consistent with those predicted by numerical simulation. This provides theoretical support for the safe mining of the 120502 isolated island working face in Liuzhuang Mine and, at the same time, provides a reference for the study of similar working faces in other domestic mining areas.
Highlights
As the mining of coal resources in our country continues to move to the depths, due to the influence of geological conditions and the need for safe mining in the mines, it is inevitable that deep mine isolated islands are formed [1,2,3,4]
Researchers have conducted a lot of research on the behavior of rock pressure on the isolated island working face and rock burst problems
Wang et al [12, 13] studied the behavior of rock pressure in the short-walled coal pillar working face of an isolated island
Summary
As the mining of coal resources in our country continues to move to the depths, due to the influence of geological conditions and the need for safe mining in the mines, it is inevitable that deep mine isolated islands are formed [1,2,3,4]. Liu et al [9] and Lu and Shi [10] analyzed the support pressure distribution characteristics of the ultralong-isolated island working face and the rock pressure behavior when the island working face crosses the fault structure. E above research studies have analyzed the appearance behaviors of rock pressure in different types of isolated island working faces and the prevention and control of rock bursts and have achieved good results. Based on the engineering background of 120502 isolated island working face in Liu Zhuang Coal Mine, this paper analyzes the behavior of underground pressure on the isolated island working face under the goaf of the deep close coal seam group through numerical simulation and field measurement. E 120502 working face is a monoclinic structure with an average dip angle of 13.0°, the coal thickness of the working face is 0.98~5.58 m, and the average thickness is 4.05 m. 120502 working face 5 coal false roof is not developed, the direct roof is mudstone, the upper part contains a small amount of sandy content, and the average thickness is 8.73 m. e main roof is fine sandstone. e geological histogram of the coal roof and floor of the working face is shown in Figure 2. is working face is a low-gas working face, and the coal seam is easy to combust spontaneously
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