The Ariake clay, i. e. the soft marine alluvial clay, is sedimented along the Ariake Sea, especially in the Saga plain, Kyushu, Japan. It is well-known as one of the most problematic soils in Japan, because of its high sensitivity and remarkable secondary compression. Therefore, an established method for settlement prediction is necessary as well as developing a countermeasure to control long-term settlement. This paper describes three case histories on the settlement of the Ariake clay ground. The main purpose of this paper is to compare the observed settlements with calculated settlements by six prediction methods proposed by Miyagawa, Hoshino, Asaoka, Terzaghi, Yasuhara and Tanabashi. The applicabilities and the features of each prediction method have been clarified from comparison of predicted results with observed settlements.
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