Each SDCM pile was constructed by insertion of prestressed concrete pile immediately after deep cement mixing had completed. Twenty of the deep mixing piles were utilized as SDCM piles. Each deep mixing pile had a diameter of 0.6 m and length of 7.0 m. The water:cement ratio (W:C) of the cement slurry and the cement content employed for the construction of deep mixing piles were 1.5 and 150 kg (m 3of soil), respectively. 2.3, with 2.0-m spacing in a square pattern by jet mixing method employing a jet pressure of 22 MPa. A total of 27 deep mixing piles were installed down to the bottom of the soft clay layer, as shown in Fig.
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