During dredging activities, a large amount of dredged clay slurry or lump is produced. A dumping site composed of soft clay near the water body is often used to deposit dredged soft fill. Soil-cement columns are commonly employed to treat the soft ground for this application. Under soft fill, failure of soft clay dominates the behaviour of composite ground. Hence, a soil-cement slab is needed to form a load transfer platform above the columns, which is costly. As an alternative, the use of T-shaped column with an enlarged column cap is proposed. In this study, the responses of composite ground with T-shaped column are measured experimentally, which are used to calibrate a numerical model. The results of numerical parametric analyses show that the implementation of T-shaped column under soft fill can change the governing failure mode into column failure, once the diameter of column cap exceeds a certain value, after which the improvement efficiency is the same between T-shaped column and column-slab system. The height of column cap results in negligible difference in bearing capacity, and a minimum value of 0.3 m is suggested for use in design to avoid punching failure.

在疏activities活动期间，会产生大量疏clay的泥浆或块状物。通常在水体附近使用由软粘土组成的倾倒场来沉积疏soft的软土。为此，通常使用土壤水泥柱来处理软土地基。在软填充下，软黏土的破坏支配着复合地面的行为。因此，需要土壤水泥板来在柱上方形成载荷传递平台，这是昂贵的。作为替代方案，建议使用带有扩大的柱帽的T形柱。在这项研究中，实验测量了T形柱复合地基的响应，用于校准数值模型。数值参数分析结果表明，软填充T形柱的实施，一旦柱帽直径超过一定值，则可将控制失效模式从柱失效转变为柱失效，之后T-型柱的改进效率是相同的。异型柱和柱板系统。柱帽的高度导致的承载力差异可忽略不计，建议在设计中使用最小值0.3 m以避免打孔失败。