Settlement Analysis of Pakpanang Closure Dam

摘要

This paper proposed the settlement predictions of Pakpanang closure dam constructed on soil-cement column. The spacing of studies soil-cement column was over the limitation of Broms&Boman (1977) and Sweroad (1992) methods. The assumption of equivalent footing at the depth of 2L/3 length of column and at the end of column for conventional method were therefore applied. Settlement analyses were conducted using Terzaghi&Peck (1948) and Duncan&Buchignani (1976) theories. The coefficient of vertical consolidation (C_v) calculated by Asaoka (1978) method conforms to the actual settlement. Asaoka's graphic method was the best predictor with 3 percent different from the actual settlement rate. Furthermore, lateral displacements were determined. The maximum lateral displacement was found at 12th month, which is 24.53 mm at the center of the closure dam in the direction of downstream.