Abstract
The gob-side roadway of 130205, a large-mining-height working face in the Yangchangwan coal mine, was investigated in terms of the mine pressure law and support technology for large mining heights and narrow coal pillars for mining roadways. The research included field investigations, theoretical analysis, numerical simulation, field tests, and other methods. This paper analyzes the form of movement for overlying rock structure in a gob-side entry with a large mining height and summarizes the stress state and deformation failure characteristics of the surrounding rock. The failure mechanism of the surrounding rock of the gob-side roadway and controllable engineering factors causing deformation were analyzed. FLAC3D numerical simulation software was used to explore the influence law of coal pillar width, working face mining height, and mining intensity on the stability of the surrounding rock of the gob-side roadway. Ensuring the integrity of the coal pillar, improving the coordination of the system, and using asymmetric support structures as the core support concept are proposed. A reasonably designed support scheme for the gob-side roadway of the working face for 130205 was conducted, and a desirable engineering effect was obtained through field practice verification.
Highlights
Erefore, the research on surrounding rock control technology of gob-side entry with large mining height in inclined thick coal seam has great innovation
Engineering Geology. e Yangchangwan coal mine primarily focuses on the No 2 coal seam. e coal seam has a simple structure, with an average thickness of 7.9 m, an average dip angle of 18°, and well-developed joints. e Proctor coefficient f 1∼2. e rock properties of the roof and floor of the coal seam are depicted in Figure 1. ere is a 0.2–0.6 m thick false roof between the No 2 coal seam and the direct roof. e false roof is affected by the ground pressure and mining and falls during mining, which makes roof management of the working face difficult
Engineering Background. e 130205 working face is located in the middle of the first division of the Yangchangwan mine, with a buried depth of 630 m, and the mining method of full thickness with large mining height has been adopted for it
Summary
E 130205 working face is located in the middle of the first division of the Yangchangwan mine, with a buried depth of 630 m, and the mining method of full thickness with large mining height has been adopted for it. A 5 m coal pillar is reserved for the 130205 return air roadway, which is driven along the roof of the coal seam. In the initial stage of driving along goaf roadway in the 130205 working face of Yangchangwan Coal Mine, the fieldmeasured displacement of two sides of roadway reaches 457 mm, the subsidence of coal pillar side roof is 268 mm, and the subsidence of solid coal side roof is 192 mm. In the initial stage of driving along goaf roadway in the 130205 working face of Yangchangwan Coal Mine, the fieldmeasured displacement of two sides of roadway reaches 457 mm, the subsidence of coal pillar side roof is 268 mm, and the subsidence of solid coal side roof is 192 mm. e mine pressure behavior of roadway shows obvious asymmetry
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