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Minerals 2017, 7(5), 75; doi:10.3390/min7050075

An Innovative Support Structure for Gob-Side Entry Retention in Steep Coal Seam Mining

State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
These authors contributed equally to this work.
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Authors to whom correspondence should be addressed.
Academic Editor: W. Scott Dunbar
Received: 30 March 2017 / Revised: 3 May 2017 / Accepted: 8 May 2017 / Published: 11 May 2017

Abstract

This study considered longwall working face No. 41101—located in a steeply inclined coal seam at the Awuzisu coal mine in Xinjiang, China—as an example in which macroscopic shear cracks had occurred in the cement-based filling body of the gob-side entry retention structure. A mechanical model of the support structure for the gob-side entry retention was first established. Then, field observations and laboratory tests were used to obtain the force exerted by the coal wall on the main roof, the relationship between the axial bearing capacity and compression ratio of the rubble inside the gob, the supporting force exerted by the rubble and filling body, and the thrust of the rubble on the filling body. The shear stress experienced by the roadside filling body of the gob-side entry retention in working face No. 41101 was calculated to be 15.89 MPa. To meet the needs of roadside support, an innovative roadside backfill–truss support structure was adopted, with a 60° angle of inclination used for the anchor bolts of the gob-side entry retention structure. In this way, the ultimate shear strength was improved by 107.54% in comparison with the cement-based filling body. View Full-Text
Keywords: steeply inclined coal seam; gob-side entry retention; support mechanism; backfill–truss support steeply inclined coal seam; gob-side entry retention; support mechanism; backfill–truss support
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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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Ning, J.; Wang, J.; Bu, T.; Hu, S.; Liu, X. An Innovative Support Structure for Gob-Side Entry Retention in Steep Coal Seam Mining. Minerals 2017, 7, 75.

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