Details:

Personal Author:
Iannacchione, A. T. ;
Corporate Authors:
Pittsburgh Research Center (U.S.) ;
Conference Authors:
U.S. Rock Mechanics Symposium (31st : 1990 June 18-20 : Golden, Colorado) ;
Description:
Designing coal pillars to provide resistance against overburden and gob loads has long been an aim of rock mechanics engineers. This requirement has become more imperative as greater overburdens are encountered and when mining in stiff coal-bearing strata. Current design procedures rely on theories of coal pillar behavior that take into consideration a common hypothesis. This hypothesis states that the elastic core is surrounded by an inelastic yield zone. The distribution of stress at low-to-moderate pillar loads has been effectively defined by this hypothesis. However, it suffers greatly when applied to large width-to-height (w/h >lo) coal pillars under considerable overburden (>500 m) . In these situations, the hypothesis says the elastic core can achieve unrealistic stress states giving the pillars extremely high calculated strength. A growing body of field studies has shown this is not the case. It has become clear that same other mechanism must be involved. It is the purpose of this paper to discuss the importance of an interface slip mechanism between the coal- bed and the surrounding strata in controlling the extent and pattern of stresses and deformations in a coal pillar.
Subject:
[+]
Mining

Source:
Rock mechanics: contributions and challenges: proceedings of the 31st U.S. Symposium, June 18-20, 1990, Colorado School of Mines, Golden, Colorado. Hustrulid WA, Johnson GA, eds. Brookfield, VT: A.A. Balkema, 1990 Jan ; :153-160;
Document Type:
Book Chapter ;
Genre:
Conference Publications ;
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:f978bc453d2f67354de73c9e80216d54c94981dee97a79440588bf6510462426
File Type:

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