快速掘进工作面围岩分区平行锚固技术

doi:10.13722/j.cnki.jrme.2022.1315

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Abstract In order to solve the surrounding rock support problems in rapid heading faces with heading and anchoring integration，taking the headgate in No. 2 Coal Mine of Huangling Mine as the engineering background，based on the field investigation of heading technology current situation，the idea of partitioned parallel anchoring is proposed，and the partitioned parallel anchoring technology in rapid heading face is systematic studied through numerical simulation and engineering practice. Numerical simulation results show that the surrounding rock stress of the entry is redistributed during excavation，the stress peak is about 3 m in front of heading face，the rock mass within and around the entry contour begin to deform at this position. The entry shallow rock strata within 2 m behind heading face are still in three-dimensional stress state，the surrounding rock deformation and damage amplitude are small at the initial stage of entry formation. The surrounding rock stress tend to be relatively stable at the position about 7 m behind heading face，while the surrounding rock deformation and failure tend to be relatively stable at the position about 8 m behind heading face. The stress state，the principal stress magnitude and direction in shallow rock of entry roof are changed fundamentally，and the principal stress in shallow rock of entry side is decreased significantly after excavation. On this basis，the mechanism of partitioned parallel anchoring is proposed：the surrounding rock near heading face should be anchored timely to form a local anchoring system within the range where the shallow strata of entry roof still have a certain vertical stress，the shallow strata of entry side still have a certain horizontal stress，and the deformation and damage of surrounding rock are small，at the same time，the remaining bolts and anchor cables are quickly installed in the relatively stable area behind heading face to form an integral anchoring system. Combined with the actual mining conditions，the partitioned parallel anchoring scheme is proposed，the effect of partitioned parallel anchoring is demonstrated by numerical simulation，and the heading cycle operation technology and parallel anchoring technology are determined. Practice shows that the partitioned parallel anchoring technology ensure the smooth implementation of rapid heading with heading and anchoring integration，the average monthly footage is increased by more than 124%，the parallel operation time is increased to more than 50%，and the heading efficiency is significantly improved. The stress of anchoring system is reasonable，the surrounding rock deformation is small，and the entry is stable as a whole，which provides effective alternative to control the surrounding rock in rapid heading faces with heading and anchoring integration under similar conditions.

Key words： mining engineering mining entry heading face rapid heading strata control partitioned parallel anchoring heading and anchoring integration

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	WANG Qi1
	2
	3
	KANG Hongpu1
	4
	WANG Bukang1
	2
	3
	GAO Fuqiang1
	4
	SHI Zhiyuan1
	4
	WEI Shuai2
	3

Cite this article:

WANG Qi1,2,3, et al. Research on surrounding rock partitioned parallel anchoring technology in rapid heading faces[J]. , 2023, 42(11): 2739-2752.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1315 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2739

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