Deformation Analysis of Soft Ground Treated with Granular Layer Under Embankment Loading
摘要
Construction control of an embankment on soft ground is critical as it could develop large settlements and deform laterally leading to failure. An embankment with top width of 45 m, side slopes of 1 V:1.5H, and height of 4 m is analyzed. Settlement at the center and lateral displacement at the toe of the embankment that occur during its construction are estimated using PLAXIS 2D. Embankment is constructed in several stages with layer thicknesses of 0.5 and 1.0 m allowed to consolidate for 5, 10, and 15 days each. The embankment is further stabilized by replacing near-surface soft soil with 1.0 m thick dense sand bed that extends by 3.0 m beyond the base on either side. Deformations of soft ground with and without granular beds are analyzed for varying embankment heights. The results confirm that providing a granular bed diminishes the lateral displacement, facilitating expedited construction and reducing construction time.