Development of an Integrated System of Monitoring for the Detection of Imminent Subsidence.
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Numerous instances of surface subsidence resulting from shallow, abandoned mine workings have been reported over a large portion of the anthracite coal region of northeastern Pennsylvania. This study presents a methodology for identifying sites within the anthracite region that have the potential for imminent subsidence, and proposes an integrated monitoring plan capable of detecting incipient subsidence prior to its surface manifestations. The site screening methodology is based on the premise that the monitoring sites should be located in areas characterized by high subsidence risk. A technique for assigning subsidence risks is presented. The integrated monitoring plan proposed involves the use of two surface geophysical methods (ground penetrating radar and electro-magnetics) in combination with in situ displacement sensors. This selection is performed by progressive elimination of over 30 viable instrument alternatives. The selected instrumentation systems are fully described along with a conceptual plan for utilizing these methods in six selected monitoring sites within the study region. Finally, recommendations for the field testing and evaluation of the candidate instrument systems are provided.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
Engineers Int'l, Inc.