Change of permeability of shallow foundation for fill dams due to excavation and embankment
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概要
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Effectiveness of dam foundation grouting is usually evaluated by Lugeon water test with a five-meter-long test section. In addition to the evaluation of average permeability of foundation around five-meter-long section, it is very significant to investigate the permeability of surface area adjacent to dam body and change of permeability due to the removal of ovberburden loading which is requisite for effective grouting.<BR>The following investigation has been made at two fill dam construction sites which are composed of unconsolidated conglomerate. Grouting has been performed under the condition that five-meter-thick foundation remained. After the excavation of foundation and the embankment, permeability tests have been conducted with not only five-meter-long test section but also 1- or 0.5-meter-long one. Based on the results of these tests, the looseness due to the excavation and the consolidation due to the following embankment have been considered.
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