Analysis of Cooperative Control Effect of Pressure Relief and Long Bolt Support for Deep Roadway Under Strong Mining Dis
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ORIGINAL PAPER
Analysis of Cooperative Control Effect of Pressure Relief and Long Bolt Support for Deep Roadway Under Strong Mining Disturbance of Adjacent Working Face Sujian Wang . Zhe Xiang . Jinping Deng . Houqiang Yang . Xingguo Yang . Shengyao Jin
Received: 28 September 2020 / Accepted: 26 October 2020 Ó Springer Nature Switzerland AG 2020
bolt can ensure the supporting effect while reducing the consumption of anchor cables in the roof, and can reduce the roadway floor heave by 5.5%. Moreover, the peak lateral pressure of the roadway is reduced by 12.5%, the peak value is shifted to the depth by 6 m, and the floor heave of the roadway is reduced by 36% when the countermeasures of pressure relief in the ribs and floor are adopted. This indicates that the schemes of pressure relief and long bolt support has a significant beneficial effect on decreasing the high stress environment and controlling the deformation of roadway.
Abstract The stability of mining roadways is pivotal to safe mining in deep underground coal mines. In order to control the stability of mining roadways in deep mines, this paper studies the cooperative control effect of pressure relief and long bolt support for deep roadway under strong mining disturbance of adjacent working face in Wenjiapo Coal Mine in West China. The numerical calculation software FLAC3D was used to simulate the distribution law of the displacement, stress and plastic zone around the roadway under the disturbance of excavation and working face mining with three support schemes: ‘‘short bolt ? long cable’’, ‘‘long bolt ? short cable’’, and ‘‘long bolt ? short cable ? drillholes and cutting grooves pressure relief’’. The results show that extending the length of
Keywords Deep roadway Strong mining Pressure relief Long bolt Numerical simulation
S. Wang S. Jin Shaanxi Coal and Chemical Technology Institute Company Limited, Xi’an 710100, China
1 Introduction
S. Wang S. Jin The National Joint Engineering Research Center of the Green, Safe and Efficient Coal Mining, Xi’an 710065, China S. Wang S. Jin Sanqin Scholar Innovation Team, Shaanxi Coal Industry Chemical Group Co., Ltd., Xi’an 710100, China Z. Xiang (&) J. Deng H. Yang X. Yang Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China e-mail: [email protected]
With the increase of mining intensity and depth, urgent and difficult technical problems such as ‘‘Five Highs and Two Disturbances’’ have become increasingly prominent. Deep rock masses exhibit obviously nonlinear large deformation and other soft rock mechanical properties (Kang et al. 2020; Yang et al. 2017; Wang et al. 2018; Huang et al. 2020; Sun et al. 2015). Roof collapse, floor heave and water inrush are particularly obvious, and the difficulty of disaster control increases dramatically (Yan et al. 2017; Xie et al. 2016; Fang and Zhang 2014;Zhang et al.
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