ICGCM Papers:
Subsidence and Slope Stability
 
 
Options to Control Groundwater-Based Georisks along Geological Faults in the Large Scale Area of Influence of An Open Pit Mine
35th International Conference on Ground Control in Mining
Options to Control Groundwater-Based Georisks along Geological Faults in the Large Scale Area of Influence of An Open Pit Mine
by
Axel PreusseDaniel BeckersMarkus PapstDenise Müller, RWTH Aachen University, Aachen, Germany
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[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Subsidence and Slope Stability
[Author] Axel PreusseDaniel BeckersMarkus PapstDenise Müller, RWTH Aachen University, Aachen, Germany
[Abstract] 
Key Conclusions:
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This paper outlines the necessity of detailed mapping of the entire geology for future forecasts and monitoring due to the dewatering of opencast lignite mining in Germany. Therefore the task areas of subsurface spatial planning are essential.
Key Findings:
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The geology along faults and regions of meadows with turf inclusions are endangered. Compared to the surrounding geology those parts react entirely different on water removal, which lead to immense differences of the subsidences. Compared to spacious uniformly subsidences those geologies might cause damages of major significance. A detailed mapping is necessary.
Objective of the Paper:
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Due to densely populated areas the interaction of dewatering and heterogeneous geology along faults plays an essential role regarding claims of landowners with damages on their houses. Different rates of subsidences on the one and the other side of a geological fault are associated with the structure of the geology and soil mechanics properties. Horizons with various thickness and type of soil react dissimilar on dewatering. Case studies regarding ground movements and anomalies of movements along faults are being discussed. To be able to do future forecasts and to monitor geological faults a mapping has to be created in the context of subsurface spatial planning.
Problem Statement:
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Ground water pumping for opencast lignite mining in Germany leads to rock deformation and therefore to spacious subsidences in densely populated areas. Beside spacious uniformly subsidences there are also inconsistent ground movements along heterogeneous geologies around the pit. Along those geological faults the rates of subsidences are different which lead to considerably consequences (mine damages).