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

Characterization of Chain Pillar Stability in a Deep Western Coal Mine - Case Study.

Authors
Demarco-MJ; Koehler-JR; Lu-PH
Source
Soc Min Eng AIME Preprint 88-76 1988 :12 pages
Link
NIOSHTIC No.
10006128
Abstract
This paper describes a Bureau of Mines investigation of longwall chain pillar and entry design in two- and three-entry gate-road systems at a deep underground coal mine located in central Utah. To evaluate their respective stability characteristics, four chain pillars and two longwall panels within the two separate entry systems were instrumented with hydraulic borehole pressure cells to continuously monitor vertical and horizontal pillar and panel stresses through adjacent panel retreat. In addition, supplemental entry closure information was obtained from sites located in the vicinity of the instrumented pillars. The findings presented in this report demonstrate the practicality of evaluating mine pillar stability using in situ methods and support three significant conclusions regarding ground control aspects of the investigated two- entry system: (1) total areal entry loading was considerably less for the two-entry system, as opposed to the three-entry system, (2) a smaller percentage of opened ground in the two-entry system contributed to a marked reduction in roof falls, and (3) lower areal loading in the two-entry system suggests improved ground conditions when mining the underlying seam.
Publication Date
19880101
Document Type
OP;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
OP 71-88
NIOSH Division
DRC;
Source Name
Soc. Min. Eng. AIME Preprint 88-76, 1988, 12 PP.
State
UT;
TOP