A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
In situ yield behaviour of a coal pillar
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.
In situ yield behaviour of a coal pillar
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.
In situ yield behaviour of a coal pillar
Newman, David A. (author)
1989
Article (Journal)
English
BKL:
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
Local classification TIB:
275/3730/4800
| British Library Conference Proceedings | 1995
Coal pillar behaviour from underground stress measurements
| British Library Conference Proceedings | 1999
A strain softening model for coal via back analysis of in-situ coal pillar tests
| British Library Conference Proceedings | 2005
A hypothesis for yield pillar behaviour in potash mining based on field observations
| British Library Conference Proceedings | 1992
Modeling behaviors of a coal pillar rib using the progressive S-shaped yield criterion
| DOAJ | 2020