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Causes and control of coal mine bumps.

Authors
Haramy-KY; McDonnell-JP
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI-9225, 1998 Jan; :1-35
Link
NIOSHTIC No.
10006586
Abstract
Coal mine bumps involve the violent, rapid failure of coal and rock around a mine excavation. Deep coal mines with strong roof and floor rocks and high-stress conditions frequently experience face and rib bumps. The bump problem is becoming more severe as mining depth increases, prompting efforts to control high stress in advance of mining. This Bureau of Mines report presents a review of the most widely used methods to detect and destress high-stress zones along coal faces and an investigation of stress-related bump problems and destressing techniques at a cooperating mine. Geotechnical instrumentation and microseismic methods were used to better understand bump occurrences in underground coal mines. Laboratory tests of the drilling-yield method for high-stress detection were conducted to determine the correlation between the volume of cuttings obtained and the magnitude of the applied stress at various confining pressures. A three-dimensional, multiple-seam computer modeling program, mulsim, was used to evalaute the effectiveness of stress-relief methods. Modeling results indicate that dangerously high-stress areas can be controlled by either proper planning or destressing. Proper mine planning guidelines and destressing methods such as volley firing, hydraulic fracturing, and auger drilling are discussed.
Keywords
Mining-industry; Geology; Rock-bursts; Rock-mechanics; Coal-mining; Underground-mining; Models; Computer-models; Computer-software
Publication Date
19880101
Document Type
IH; Report of Investigations
Fiscal Year
1988
NTIS Accession No.
PB90-268772
NTIS Price
A03
Identifying No.
RI-9225
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI-9225
State
CO
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