Conference Proceedings
11th International Conference on Ground Control in Mining, Wollongong, July 1992
Conference Proceedings
11th International Conference on Ground Control in Mining, Wollongong, July 1992
Detailed Underground Measurements of Roof Deflection and Bed Seperation
To learn more about the fundamental roof behaviour in South African coal mines, accurate underground measurements of roof deflection were conducted in bord and pillar panels during development and pillar extraction. To conduct these measurements a survey levelling technique was adapted. The overall system reading accuracy was established as being within 0,4 mm on a 15 m sighting distance. The underground sites were modelled and, for a roadway development, similar symmetrical curvatures were calculated by a linear elastic model, as were measured underground. In a pillar extraction panel, a significant amount of bed separation was measured and the roof underwent an a-symmetric movement due to the close presence of the mined out area at one side of the roadway.
Contributor(s):
A Vervoort, B Jack, F Jackson, G Prohaska
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- Published: 1992
- PDF Size: 0.942 Mb.
- Unique ID: P199207031