Development of a Fiber Optic Stress Sensor
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- 作者：Heasley ; K. A. ; Dubaniewicz ; H. ; Dimartino ; M. D.
- 关键词：creep ; fiber optic ; field instrumentation ; field tests ; grouting ; in situ rock stress ; instrumentation ; laboratory tests ; monitoring ; strain ; stress ; stress measurement
- 刊名：International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
- 出版年：1997
- 出版时间：April 6, 1997
- 年：1997
- 卷：34
- 期：3-4
- 页码：651
- 全文大小：86.3 K
文摘
Geologic stability is a major concern in all underground mines. It has a direct bearing on the safety and productivity of both coal and non-coal mining operations. Underground excavations cause changes in the stress regime of the surrounding strata. Depending on the geologic structure and material properties of the rock mass, these stress changes may result in stress levels and strata deformations that create unstable conditions. The ability to reliably measure the distribution of stress within a given geologic structure would allow mining researchers and production personnel to better study and predict geologic instabilities that threaten worker safety and productivity. Presently, conventional geomechanical stress measuring instruments (strain gage, hydraulic or vibrating wire systems) can only provide measurements at a single point. Reliable stress analysis typically requires knowledge of a stress distribution or profile, therefore many instruments must be installed at a given site. Using many single-point sensors to measure stress distributions is expensive, difficult to implement, and still does not provide a true distributed stress reading.