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Sustainability 2017, 9(10), 1671; doi:10.3390/su9101671

Stability Control of Retained Goaf-Side Gateroad under Different Roof Conditions in Deep Underground Y Type Longwall Mining

1
College of Geological and Mining Engineering, Xinjiang University, Urumchi 830047, China
2
Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan
*
Author to whom correspondence should be addressed.
Received: 5 September 2017 / Revised: 19 September 2017 / Accepted: 19 September 2017 / Published: 21 September 2017
(This article belongs to the Section Energy Sustainability)
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Abstract

Stability of the retained goaf-side gateroad (RGSG) is influenced mainly by the movements of the roof strata near coal seam after coalface passes by. To make effective controlling technology for the stability of the RGSG, we analyze the roof structure over the RGSG to illustrate the mechanism causing the RGSG instability under different roof conditions. We then examine the dynamic evolution of the deformation and abutment stress in the rock surrounding the RGSG during coal seam mining, using the FLAC3D numerical software to reveal the instability characteristics of the RGSG under different roof conditions. Next, corresponding stability controlling technologies for the RGSGs are proposed and tested in three typical deep underground coalmines. Results show that: sink and rotation of the roof cantilever over the RGSG impose severer influence on the stability of the RGSG. The RGSG suffers disturbances three times during the coal-seam mining, and the deformation and abutment stress in the rock surrounding the RGSG increase significantly when the main roof becomes thicker and the immediate roof becomes thinner. Staged support technology involving grout cable bolts has better controlling results of the RGSG stability than that composed of conventional rock bolts, when the RGSG is beneath weak immediate roof with large thickness. Roof structure optimizing technology involving pre-split technology can improve the stability of the RGSG effectively when the RGSG is covered by hard main roof with large thickness directly. View Full-Text
Keywords: Y type longwall mining; retained goaf-side gateroad (RGSG); stability control; FLAC3D simulation; roof strata; deep underground coalmine Y type longwall mining; retained goaf-side gateroad (RGSG); stability control; FLAC3D simulation; roof strata; deep underground coalmine
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, Z.; Shimada, H.; Sasaoka, T.; Hamanaka, A. Stability Control of Retained Goaf-Side Gateroad under Different Roof Conditions in Deep Underground Y Type Longwall Mining. Sustainability 2017, 9, 1671.

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