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Assessment of surface fracture depth and intensity due to subsidence over the longwall panel using a sonic technique
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Citation (Style = APA)
Khair, A. W. (1989). Assessment of surface fracture depth and intensity due to subsidence over the longwall panel using a sonic technique. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
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SpreadSheed (CSV)
Khair, A. W. (1989). Assessment of surface fracture depth and intensity due to subsidence over the longwall panel using a sonic technique. Rock Mechanics as a Guide for Efficient Utilization of Natural Resources
Citation Downloads
Reference Manager (RIS)
SpreadSheed (CSV)
Organization: International Conference on Ground Control in Mining
Pages: 8
Publication Date:
Jan 1, 1989
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Abstract
Abstract
| This paper presents an analysis of fracture depth and intensity due to subsidence over the longwall panel. Sonic reflection techniques were utilized to determine fracture depth, and a variation of p-wave velocity was used as an indication of the fracture intensity. Instrumentation has been tested for consistency and accuracy first in the laboratory using small scale models, then applied in the field in two mine sites with different mining geometry and geologic conditions. A new sonic viewer was utilized for sonic velocity measurements. Regular hammering method was on acoustic source. The results were concurrent with monitored horizontal strain profiles and measured open fractures over the longwall panels. |
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