Coal Mine Workface Geological Hazard Mapping and Its Optimum Support Design: A Case Study

Hui, Yanchao, Chen, Zhongwei, Zhang, Jixiong and Ju, Feng (2013) Coal Mine Workface Geological Hazard Mapping and Its Optimum Support Design: A Case Study. Disaster Advances, 6 5 (Special Issue): 66-84.

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Name Description MIMEType Size Downloads
Author Hui, Yanchao
Chen, Zhongwei
Zhang, Jixiong
Ju, Feng
Title Coal Mine Workface Geological Hazard Mapping and Its Optimum Support Design: A Case Study
Journal name Disaster Advances
ISSN 0974-262X
Publication date 2013-11
Year available 2013
Sub-type Article (original research)
Volume 6
Issue 5 (Special Issue)
Start page 66
End page 84
Total pages 19
Place of publication Indore, Madhya Pradesh, India
Publisher Dr. Shankar Lal/Gargh, Ed. & Pub.
Collection year 2014
Language eng
Formatted abstract
Longwall roof stability is essential to ensure uninterrupted production. The effectiveness of roof support design is affected by many factors including roof conditions, the presence of water, faults, joints and weathering. The in-situ stress directions and magnitudes for the surrounding rockmass of an underground coal mine also plays an important role in its support designs and risk management. This study aims to improve the strata control safety management and to reduce the delays in operation as a result of strata failures for the New Bulli Coal Mine (NBC mine), Australia. The improvement process is conducted through an integrated approach of geological hazard mapping, support system design, and numerical validation.

Firstly, by considering the impact of water inflow, Coal Mining Roof Rating (CMRR) values, fault zones and in-situ stress, the geological hazard mapping for longwall panels 6 and 7 was determined, and the critical zones of failure for both panels are identified. Based on the ALTS (Analysis of Longwall Tailgate Serviceability) primary roof support software, three optimum bolt support designs were established in terms of both the support competency and total costs. Then, a finite element numerical model was implemented to further testify the optimum design in terms of the support effectiveness. The results show that an optimum support outcome can be achieved using five 2.6 m fully-grouted rock bolts and two 6 m plain strained cable bolts with row spacing at 1.6 m apart. The new roof support design enables New Bulli Coal Mine to operate at a higher production rate with a safer working environment, and the methodology adapted in this research can be implemented to other underground coal mines with similar strata control issues.
Keyword Roof support design
Coal mining roof rating
Numerical modeling
Hazard mapping
Mechanism
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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Created: Sun, 01 Dec 2013, 00:02:18 EST by System User on behalf of School of Mechanical and Mining Engineering