Stabilisation of bank slopes that are prone to liquefaction in ecologically sensitive areas.
A consequence of lignite stripping in the Lusatia mining district (East Germany) is the backfilling of dumps that mainly consist of low-compacted fine and medium-grained sands. When the ground-water table, which had been lowered while stripping the coal, is rising again, these dumps might be affected by a settlement flow due to the liquefaction of soils. Common methods for stabilisation as, for instance, blasting or vibrator-jetting deep compaction, are not very useful in ecologically sensitive areas, where dumps have been afforested and embankment areas of residual lakes have developed into highly valuable biotopes. A new so-called air-impulse method in combination with directional horizontal drilling has been developed, which does not have a considerably negative impact on the vegetation during compaction. The experience gained during the first employment of this method at the lake "Katja", a residual lake of lignite stripping, is presented in this paper.
Nestler
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Department of Mining Engineering III, Aachen University of Technology, Lochnerstrasse 4-20, D-52064 Aachen, Germany. lgrb@lgrb.de
Stoll
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D003032:Coal Mining; D004463:Ecology; D004787:Environmental Pollution / Q000032:analysis / Q000517:prevention & control*; D005618:Fresh Water; D019015:Geologic Sediments; D005858:Germany; D006801:Humans; D007220:Industrial Waste / Q000009:adverse effects*; D014197:Trees; D014872:Water Movements
D007220:Industrial Waste