近距离煤层综放末采关键块体回转机制及其应用

doi:10.13722/j.cnki.jrme.2022.0851

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Abstract In view of the adverse effects of the residual boundary coal pillar on the surrounding rock of the lower fully mechanized top coal caving face in the end-mining period，taking the close distance coal seams of the Yanzishan coal mine as the research background，the end-mining overburden environment of the lower coal seam is classified into four categories，namely，the gob side of boundary pillar，the solid coal side of boundary pillar，the gob and the solid coal. By establishing the rotation speed mechanical model of key blocks under abnormal loads，its rotation during the end-mining period of fully mechanized top coal caving face is divided into four stages. The critical angle，external moment and angular acceleration of each stage are solved. The angular velocity equation of the whole rotation process of the key block is obtained based on the principle of fixed axis rotation，and the influence law of the overburden load，the top-coal stopping caving distance and the main roof fracture line position on the block rotation speed is analyzed. The research shows that：(1) The influence of the overburden load on the block rotation speed is ranked as：the solid coal side of boundary coal pillar＞the gob side of boundary coal pillar＞the solid coal＞the gob. (2) The top-coal stopping caving distance can be essentially divided into three types. Type I is equivalent to the top coal without stopping，type II only reduces the rotation angle of block B without changing its rotation speed，while type III reduces the rotation angle and its angular velocity of both block B and C. (3) Compared with the main roof fracture line penetrating into the coal wall，the rotation resistance moment provided by the support structure decreases and the angular velocity of block B increases when it is located above the retracement channel，which is not conducive to the stability of the surrounding rock in the end-mining period. (4) The end-mining ground pressure control strategy of fully mechanized top coal caving face in close distance coal seams is proposed，which effectively guides the engineering practice of N0381 working face. The on-site monitoring verifies the rationality and reliability of the rotation speed mechanical model of key block under abnormal loads.

Key words： mining engineering close distance coal seams abnormal load stopping top-coal caving in the end-mining period key block rotation speed retracement channel

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	HE Fulian1
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	LV Kai1
	XU Xuhui1
	WANG Deqiu1
	LI Liang1

Cite this article:

HE Fulian1,2,LV Kai1, et al. Rotation mechanism of key blocks during end-mining period of fully mechanized caving in close distance coal seams and its application[J]. , 2023, 42(8): 1832-1846.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0851 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I8/1832

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