A COUNTERMEASURE AGAIST UPLIFT OF MANHOLES DUE TO LIQUEFACTION OF SAND FILL IN CLAYEY GROUND
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概要
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Many sewage manholes and pipes were uplifted during past earthquakes. Studies conducted after the earthquake clarified that main reason to cause the uplift is the liquefaction of sand fill. Moreover, it was observed that large uplift of sewage manholes and pipes was induced in mainly clayey grounds. A same phenomenon was occurred in Kariwa Village during the 2004 Niigataken-chuetu earthquake. Then the authors developed a countermeasure which can be applied to existing sewage manholes and pipes. In this method, water table is decreased in short time, and then water table is increased again. During this process, liquefaction strength of sand fill would increase due to over consolidation. The authors conducted several shaking table tests to demonstrate the effectiveness of the countermeasure method. Test results showed that the method could prevent the uplift of a model manhole.
- 公益社団法人 土木学会の論文
公益社団法人 土木学会 | 論文
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