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Sustainability 2016, 8(7), 627; doi:10.3390/su8070627

Stabilization of Gob-Side Entry with an Artificial Side for Sustaining Mining Work

1
School of Energy Engineering, Xi’an University of Science and Technology, Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education, Xi’an 710054, China
2
School of Mines, State Key Laboratory of Coal Resources & Safe Mining, China University of Mining & Technology, Xuzhou 221116, China
3
Department of Civil Engineering, Inha University, Incheon 402-751, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Marc A. Rosen
Received: 30 April 2016 / Revised: 27 June 2016 / Accepted: 29 June 2016 / Published: 4 July 2016
(This article belongs to the Section Sustainable Engineering and Science)

Abstract

A concrete artificial side (AS) is introduced to stabilize a gob-side entry (GSE). To evaluate the stability of the AS, a uniaxial compression failure experiment was conducted with large and small-scale specimens. The distribution characteristics of the shear stress were obtained from a numerical simulation. Based on the failure characteristics and the variation of the shear stress, a failure criterion was determined and implemented in the strengthening method for the artificial side. In an experimental test, the distribution pattern of the maximum shear stress showed an X shape, which contributed to the failure shape of the specimen. The shear stress distribution and failure shape are induced by a combination of two sets of shear stresses, which implies that failure of the AS follows the twin shear strength theory. The use of anchor bolts, bolts, and anchor bars enhances the shear strength of the artificial side. When this side is stable, the components can constrain the lateral deformation as well as improve the internal friction angle and cohesion. When the AS is damaged, the components prevent the sliding of broken blocks along the shear failure plane and improve the residual strength of the artificial side. When reinforced with an anchor bar, the AS is still stable even after mining operations for three years. View Full-Text
Keywords: gob-side entry; artificial side; failure criterion; twin-shear failure; uniaxial compression failure experiment gob-side entry; artificial side; failure criterion; twin-shear failure; uniaxial compression failure experiment
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

Wang, H.-S.; Zhang, D.-S.; Liu, L.; Guo, W.-B.; Fan, G.-W.; Song, K.-I.; Wang, X.-F. Stabilization of Gob-Side Entry with an Artificial Side for Sustaining Mining Work. Sustainability 2016, 8, 627.

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