煤巷顶板厚层跨界锚固原理与应用研究

doi:10.13722/j.cnki.jrme.2020.0970

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Abstract Surrounding rock control of deep mining roadways is a key research direction of bolt support in the future. Taking the coal roadways of Hulusu coal mine in three different periods as the engineering background，this paper analyzes the characteristics of roof progressive failure through drilling imaging，and points out the problems of insufficient coordination and low construction efficiency of combined support. To better study these problems，a single thick layer support system is proposed. Discrete element numerical simulation is used to study the evolution law of roadway displacement and surrounding rock fractures supported by bolts of different lengths and to clarify the correlation mechanism between the bolt length and the surrounding rock damage. The study reveals the principle of thick-layer transboundary anchoring in which the damage area near the bolt tip moves upward and gradually weakens with increasing the bolt length. A thick layer anchoring system and cross-boundary long anchoring technology are developed to realize continuous stress transmission in both horizontal and vertical directions by using long bolts on the roof in time. The results were applied in the 21205 working face of Hulusu coal mine. As is proved，the new technology significantly improves the driving speed of coal roadways，and reduces the development depth of roof fractures to within 0.61 m of the shallow anchorage zone. Meanwhile，the technology can also effectively curb the long-term large-scale“V”type rib spalling problem and control the large deformation of surrounding rock of coal roadways with deep composite roof.

Key words： mining engineering coal roadway roof thick layer cross-boundary anchorage bolt length driving speed

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	Articles by authors
	XIE Zhengzheng1
	2
	ZHANG Nong1
	2
	3
	HAN Changliang1
	2
	AN Yanpei1
	2

Cite this article:

XIE Zhengzheng1,2,ZHANG Nong1, et al. Research on principle and application of roof thick layer cross-boundary anchorage in coal roadways[J]. , 2021, 40(6): 1195-1208.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0970 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I6/1195

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