Electronic Resource
Springer
Geotechnical and geological engineering
7 (1989), S. 163-170
ISSN:
1573-1529
Keywords:
Coal pillar
;
underground mining
;
post-failure behaviour
;
field investigation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Summary An indication of the complete stress-strain behaviour of coal was obtained through instrumenting a headgate yield pillar and monitoring the changes in vertical and horizontal pillar stress, pillar strain, and roof-floor convergence as a function of time and distance from the moving longwall face. A semiautomated monitoring program was conducted over a 5 month period as the longwall face advanced toward and eventually passed the instrumented pillar. The development of a confined core and yield zone within the pillar was confirmed by the vertical and horizontal stress changes. Thein situ pre-failure (208 to 661 MPa) and post-failure moduli (55 to 208 MPa) of the coal were determined from the change in pillar stress versus pillar strain. Thein situ moduli are an order of magnitude lower than the 3450 MPa, commonly assumed for coal.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01554344
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