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Sustainability 2017, 9(6), 935; doi:10.3390/su9060935

A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions

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, Shaanxi, China
2
School of Sciences, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
*
Author to whom correspondence should be addressed.
Academic Editor: Marc A. Rosen
Received: 17 March 2017 / Revised: 23 May 2017 / Accepted: 27 May 2017 / Published: 2 June 2017
(This article belongs to the Section Sustainable Engineering and Science)
View Full-Text   |   Download PDF [5416 KB, uploaded 2 June 2017]   |  

Abstract

This paper presents the engineering geological properties and roof control tecnology for a thick coal seam fully-mechanized face mining with hard roof conditions (THC) at the Jinhuagong Coal Mine (JCM), northwest China. The effective support working resistance and appropriate roof control technology are two critical factors for safe and productive mining in the THC. The load-estimate-method (LOEM) is the effective method to determine the support working resistance for normal working conditions (the mining height less than 3.5 m). In order to prevent support crushing accidents from happening and to ensure the safety and high-efficiency in the THC, the LOEM was modified based on the structure of the overlying strata in the THC. The strata which can form the voussoir beam structure in normal working conditions and will break in the form of cantilever beam in the THC is defined as the key strata in the immediate roof. Therefore, the hanging length of the key strata in the immediate roof was considered in the LOEM. Furthermore, a method for calculating the hanging length of the key strata in the immediate roof and its influencing factors were proposed using cantilever beam theory analysis of the structure of the overlying strata. Moreover, in order to fully fill the goaf area with caving roof to reduce the energy accumulation of main roof movement, it was decided to apply destress blasting technique (DEBT) at the JCM to control the large hanging length of the hard roof, so as to reduce the impact of the hard main roof movement on the working face. The key technique parameters of the roof caving borehole were also proposed. The obtained results demonstrated that the theoretical analysis is reasonable, and the chosen support type and the DEBT could meet the roof control requirements. The THC has achieved safety and high-efficiency mining. View Full-Text
Keywords: hard roof; thick seam fully-mechanized; support working resistance; roof control; load-estimate-method (LOEM); destress blasting technique (DEBT) hard roof; thick seam fully-mechanized; support working resistance; roof control; load-estimate-method (LOEM); destress blasting technique (DEBT)
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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

Guo, W.-B.; Wang, H.-S.; Dong, G.-W.; Li, L.; Huang, Y.-G. A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions. Sustainability 2017, 9, 935.

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