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      Research on stress release for the gob-side roadway using the roof-cutting technology with a chainsaw arm

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          Abstract

          The narrow pillar mining method is widely adopted for working faces in coal mines. However, in cases of an overlying hard roof, a suspended triangle roof plate or a cantilever will be formed near the goaf. At this point, the coal pillar extrusion and serious deformation will occur in the gob-side roadway. In order to mitigate the problem, the roof-cutting technology with a chainsaw arm and its equipment have been developed. In this paper, based on the analysis of deformation and failure characteristics of 2312 roadway, which is close to the goaf of 2311 working face in Tashan Coal, the roof-cutting technology with a chainsaw arm was chosen to be applied in 2311 roadway. Then, the roof-cutting process and the load acting on the coal pillar were discussed and analysed. A numerical model was established to analyse the stress releasing effects after roof cutting. Moreover, the roof-cutting height and the support parameters of the roadway were optimized through numerical analysis and the results manifested that the roof cutting was the most effective when the roof-cutting height was 6.4 m. After roof cutting, the vertical stresses within the coal pillars were lowered by about 25.0%. Finally, the roof-cutting experiment was carried out in the 2311 roadway in Tashan Coal Mine. The on-site roof-cutting depth was 6.4 m and the roof-cutting width was 42 mm guided by the numerical analysis. To verify the stress-relieving effects, the borehole stress meters were applied to monitor the peak advancing stresses of narrow pillars at various depths. The measured results indicated that the peak advancing stresses decreased by 22.8% on average, and therefore, roof cutting and stress releasing effects were achieved.

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          Most cited references 25

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          Mohr–Coulomb Failure Criterion

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            An Integrated Numerical Modelling–Discrete Fracture Network Approach Applied to the Characterisation of Rock Mass Strength of Naturally Fractured Pillars

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              Numerical modeling of coal wall spall in a longwall face

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                Author and article information

                Journal
                R Soc Open Sci
                R Soc Open Sci
                RSOS
                royopensci
                Royal Society Open Science
                The Royal Society
                2054-5703
                March 2020
                4 March 2020
                4 March 2020
                : 7
                : 3
                Affiliations
                [1 ]School of Mines, China University of Mining and Technology , Xuzhou 221116, People's Republic of China
                [2 ]Datong Coal Mine Group Co. Ltd. , Datong 037000, People's Republic of China
                [3 ]State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University , Chongqing 400044, People's Republic of China
                [4 ]College of Architectural Engineering, Dalian University , Liaoning, Dalian 116622, People's Republic of China
                Author notes
                Author for correspondence: Bin Yu e-mail: yubin0352@ 123456163.com
                Article
                rsos191663
                10.1098/rsos.191663
                7137937
                © 2020 The Authors.

                Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

                Product
                Funding
                Funded by: Outstanding Innovation Scholarship for Doctoral Candidate of CUMT;
                Award ID: 2019YCBS005
                Categories
                1006
                192
                Engineering
                Research Article
                Custom metadata
                March, 2020

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