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Creep Along Weak Planes in Roof and How It Affects Stability.

Authors
Larson-MK; Wade-RG
Source
Society for Mining Engineers Annual Meeting and Exhibit, 2000, Feb 29 Mar 1 Salt Lake City, UT Littleton, CO
Link
NIOSHTIC No.
20022767
Abstract
Researchers at the National Institute for Occupational Safety and Health (NIOSH) are studying the time-dependent response of rock stressed along weakness planes. The objective is to improve mine safety by reducing the number of roof falls that cause injuries and fatalities to miners. Researchers conducted direct-shear tests on mudstone overcored from a coal mine roof. Results showed frictional strength weakens with displacement along the shearing planes. Results of direct-shear creep tests also showed timedependent deformation. Test measurements were compared to classical analytical models. Results suggest that risk of roof collapse may be decreased through layout and support design to reduce creep rates and thus slow progression toward failure.
Keywords
Coal-mining; Mining-industry; Underground-mining; Geology; Roof-falls; Accident-prevention
Publication Date
20000229
Document Type
Conference/Symposia Proceedings
Fiscal Year
2000
NTIS Accession No.
NTIS Price
NIOSH Division
SRL
Priority Area
Other Occupational Concerns
Source Name
Society for Mining Engineers Annual Meeting and Exhibit
State
WA
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