The application of stone column technique was firstly adapted to imprvoe the very soft clay in the marine swamp for constructing flood protection dyke. This dyke is about 2.5-3.0 m high and 11 km. long constructed on the 14-18 m. thick soft clay aims to protect the rising up of the seawater and create additional flood problem to Bangkok City in the rainy season. The construction was started by dumping the crush stone to prepare the platform for truck hauling and the heavy stone column equipment of about 40 tons weight. The crush stone backfill was sunk and laterally flow into the very soft clay to about 10m depth. After completion of platform, the stone column soil improvement technique was started. The original 18 m. lenght of the stone column was not successful due to its collapse in the very soft clay beneath the platform. Therefore, the length of stone column (1.0m in diameter) was changed to 10 m. and installed inside only its own platform. The platform of about 10m depth and the dyke embankemnt were acted as a surcharge to induced a huge of long-term settlement in the future. Due to the limitation of construction technique, the stone column seems to be not suitable to improve the very soft clay in the marine swamp area.
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