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Long-term Stability of Abandoned Quarry Highwalls.

Authors
Haycocks-G; Zhou-Y; Haycocks-C
Source
For Reference Only At Bureau Libraries :6 pages
Link
NIOSHTIC No.
10011155
Abstract
An investigation has been carried out into the many factors that influence long-term stability of quarry highwalls. Based on extensive field studies of abandoned quarry highwalls and existing operations, guidelines have been proposed for two distinct and yet inseparable aspects: the design of quarry highwalls for long-term stability and reevaluation of highwall stability after abandonment. The former takes into consideration the many adverse effects quarry operations have on the long-term stability of highwalls, such as blast vibration and alteration in topographic and ground water conditions. Protocols have been developed for the design of new quarries or expansion of existing quarries with regard to short- and long-term highwall stability, environmental factors, site factors, and breakage methodology. The latter concentrates on any significant changes in the variables affecting highwall stability. A major concern in this analysis is the possible effects of subsidence waves resulting from deep mining, which are occurring with increasing frequency in coal-producing areas. These result in stress redistribution in the ground and geometric changes in the original sliding surface. Tensile strain can cause dilation and reduces effective cohesion of the slope material, thus reducing slope stability. The environmental impact of highwall failure and federal regulations are also important components in both analyses.
Publication Date
19910101
Document Type
CP; Final Contract Report;
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
OFR 42-92
Source Name
For Reference Only At Bureau Libraries
State
VA;
Performing Organization
Virginia Polytechnic Inst.
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