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

Evaluation of an alternative longwall gate road design.

Authors
McDonnell-JP; Conover-DP; Cox-RM
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9541, 1995 Jan; :1-23
Link
NIOSHTIC No.
20039201
Abstract
This U.S. Bureau of Mines report describes the results from an in-mine investigation of an alternative longwall gate road design. The coal mine operator modified the pillar layout (reversed the location of the big and small pillars) in a portion of a three-entry longwall gate road area. The modified pillar layout was an attempt to reduce stress and, subsequently, stress-related ground control problems (cutter roof and dynamic floor heave events) in the tailgate region during second-panel mining. The results from borehole pressure cells (BPC's) installed in the modified gate road area showed that the ground pressures in the panel edge and adjacent small pillar were significantly reduced during second-panel mining compared to ground pressures experienced in the typical pillar layout gate road areas. The reduced stress levels around the tailgate entry adjacent to the second panel, as compared to the tailgate stress levels with the typical pillar arrangement, contributed to improved tailgate ground conditions in the test pillar zone.
Keywords
Coal-mining; Strata-control; Mathematical-models; Caving-mining; Geotechnical-engineering; Rock-mechanics; Soil-mechanics; Underground-mining; Boreholes; Columns-supports; Pressure; Longwall-mining; Mining-engineering; Mine-roadways; Structural-design
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-200887
NTIS Price
A03
Identifying No.
RI-9541
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9541
State
CO
TOP