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The Control Of Surface Subsidence By Width/Depth Ratio And Chain Pillar Size In The Presence Of Competent Coal Measures
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Citation (Style = APA)
Schumann, E. H. R. (1988). The Control Of Surface Subsidence By Width/Depth Ratio And Chain Pillar Size In The Presence Of Competent Coal Measures. Proceedings 7th International Conference on Ground Control in Mining (ICGCM) 7th
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Schumann, E. H. R. (1988). The Control Of Surface Subsidence By Width/Depth Ratio And Chain Pillar Size In The Presence Of Competent Coal Measures. Proceedings 7th International Conference on Ground Control in Mining (ICGCM) 7th
Citation Downloads
Reference Manager (RIS)
SpreadSheed (CSV)
Organization: International Conference on Ground Control in Mining
Pages: 11
Publication Date:
Jan 1, 1988
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Abstract
Abstract
| The local stratigraphy and composition of the coal measures, including competent dolerite sill and massive sandstone lavers is shown to have a restricting influence on the development and magnitude of surface subsidence above total extraction panels in South Africa. The critical panel width necessary to induce nonviolent failure of a dolerite sill is quantified. Small subsidence due to the deflection of a 70 metre thick dolerite above subcritical panels is shown by example. Maximum surface subsidence tilt an; ground strain is compared to the NCB model. An exponential subsidence profile curve, SPC, describes a trough half-profile. A parabolic relationship between horizontal displacement and tilt, which has been discovered to exist can be substituted in the first derivative of the SPC in order to generate transverse displacement and strain profiles. |
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