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Open AccessArticle

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof:A Case Study

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Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
2
State Key Laboratory of Shield Machine and Boring Technology, China Railway Tunnel Group Co., Ltd., Zhengzhou 450001, China
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(4), 1375; https://doi.org/10.3390/su12041375 (registering DOI)
Received: 15 January 2020 / Revised: 5 February 2020 / Accepted: 11 February 2020 / Published: 13 February 2020
High-efficiency maintenance and control of the deep coal roadway roof stability is a reliable guarantee for safe production and sustainable development of a coal mine. With belt haulage roadway 3108 in MenKeqing coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to reveal the law of improving the bearing state of bolts by increasing the thickness of the roof anchoring layer. Also, the mechanism of the high-efficiency and long anchoring of the roof is revealed. Results show that increasing thickness of the roof anchorage layer could mobilize deep rock mass to participate in the bearing and promote the bolt to increase the resistance in a timely manner to limit the deformation of rock mass. Through the close link between shallow soft rock mass and deep stable rock mass, the deformation of the shallow rock mass is well controlled and so are the development and expansion of the roof separated fissures from shallow to deep. Long high-performance sustainable bolt technology for roof are proposed and carried out to control the stability of the deep roadway roof. Engineering practice indicates that deformations of roof could be efficiently controlled. The maximum deformations of the roof and sidewall-to-sidewall are 17 mm and 24 mm, respectively. No obvious separation fissures are found in the anchoring range of roof. This study provides a reference for roof stability control of deep roadway under similar conditions.
Keywords: deep coal roadway; roof; deformation; bolt support; long anchoring; high-performance; efficient control deep coal roadway; roof; deformation; bolt support; long anchoring; high-performance; efficient control
MDPI and ACS Style

Yang, H.; Han, C.; Zhang, N.; Sun, Y.; Pan, D.; Sun, C. Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof:A Case Study. Sustainability 2020, 12, 1375.

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