Abstract
In Kawagoe Power Plant, a Liquified Natural Gas (LNG) station has been proposed to construct over a reclaimed land. The land reclamation work was done over a soft alluvial clay deposit in the coastal area. Due to thick soft clay deposit under the reclaimed land, there were some problems, specially, regarding the insufficient lateral resistance for the piles during liquefaction due to the possible earthquakes. It was expected that the residual settlement may further complicate the structure. In order to solve these problems, pumping well installation was proposed at the sand layer above the soft clay deposit, so that the consolidation could be accelerated by lowering the ground water table. Before construction of the LNG station, one in-situ test section was prepared. The pumping rate and the settlement rate were closely monitored using the observational method. It was observed that the design goals were achieved using the observational method. The settlement observed was enough and the lateral resistance was also achieved as required by the design standard.
