Clarification of the mechanism, prediction in the future and impact assessment to the reclamation dikes concerning the subsidence in the Shiroishi district in Saga Prefecture

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It was cleared that the subsidence in the Shiroishi district in Saga Prefecture due to the drawing up of a large amount of groundwater for agricultural water and city water had been chiefly caused by the consolidation(compression)of the alluvium deposit (surface layer) that the majority consisted of Ariake clay. When the present groundwater level was maintained, the subsidence in the Shiroishi district was judged to be continuance for the time being by the consolidation of Ariake clay layer though was a little in the future based on the subsidence observation data and the consolidation theory. Moreover, the influences such as the cracking by the differential settlement in the slope part of the embankment were suggested from the behavior analysis of the reclamation dike at the drought (decrease in the groundwater level) by the finite element method.