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Longwall mining-induced abutment loads and their impacts on pillar and entry stability.

Authors
Chen-J; Mishra-M; Zahl-E; Dunford-J; Thompson-R
Source
Proceedings of the 21st International Conference on Ground Control in Mining, August 6-8, 2002, Morgantown, West Virginia. Peng SS, Mark C, Khair AW, Heasley KA, eds., Morgantown, WV: West Virginia University, 2002 Aug; :11-17
Link
NIOSHTIC No.
20025551
Abstract
Longwall mining-induced abutment loads on the surrounding pillars can be grouped into two categories in terms of the relative position of teh coal pillars and the longwall face. They are the front and side abutment loads. Even though a lot of research and efforts have been made to study the nature and behavior of these longwall mining-induced abutment loads, their influence zones and magnitude are still not well defined and fully understood due to the complexity of geological conditions and the longwall mining-induced overburden strata movement. The uncertainty about the mining-induced abutment loads often forces consultants and mining engineers to employ a conservative approach in designing coal pillars and entry roof control plans. The problems with this approach are that: (a) it increases CM development-longwall retreat footage ratio, (b) it decreases coal recovery, and (c) it increases the operating costs. However, a more liberal approach may create safety issues and result in loss of production. Therefore, the importance of accurately defining the influence zones and magnitude of the front and side abutment loads induced by longwall mining can never be over emphasized. The authors in this paper attempt to define the influence zones and discuss the magnitude of the longwall mining-induced abutment loads by analyzing the field data measured at RAG American Coal Company's longwall mines. In addition, the relationship between entry stability and the balance among roof/floor conditions, pillar design, and roof control plan is also briefly discussed.
Keywords
Longwall-mining; Coal-mining; Geology; Mining-industry; Miners; Safety-research; Safety-engineering; Ground-control; Ground-stability; Rock-mechanics
Publication Date
20020806
Document Type
Conference/Symposia Proceedings
Editors
Peng-SS; Mark-C; Khair-AW; Heasley-KA
Fiscal Year
2002
NTIS Accession No.
NTIS Price
ISBN No.
0939084569
NIOSH Division
SRL
Source Name
Proceedings of the 21st International Conference on Ground Control in Mining, August 6-8, 2002, Morgantown, West Virginia
State
WA; PA; CO; WV
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