Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Development of Roof Control Criteria for Underground Longwall Mining.

Authors
Peng-SS
Source
For Reference Only At Bureau Libraries :216 pages
Link
NIOSHTIC No.
10003458
Abstract
The purpose of this study was to analyze the effects of strata behavior on longwall panels caused by mining. The study was focused on the weighting phenomena and their effects on front abutments, and the chain pillar stability and pillar design under various roof conditions. Using the three-dimensional finite element, the overburden depth, mechanical properties of the immediate roof and the main roof, panel width, and size of the chain pillar were analyzed. Four models were used to simulate various phases of panel production under various combinations of the above parameters. Model 1 simulated the beginning of panel mining, model 2 simulated the passage of the longwall face of more than half the panel length, model 3 simulated the completion of panel productions, and model 4 simulated the second panel mining. By applying the multiple- regression model to analyze the finite element results, the following were devloped: (1) a formula that classifies the type of roof strata at the face area, (2) formulas that predict the first weighting and periodic weighting lengths, and (3) a formula that designs, the chain pillar size.
Publication Date
19840101
Document Type
CP; Final Contract Report;
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OFR 91-84
NIOSH Division
WO;
Source Name
For Reference Only At Bureau Libraries
State
WV;
Performing Organization
West Virginia University
TOP