Abstract Dynamic responses of the geosynthetic-encased stone column (GESC) supported embankment under traffic loads have become a hot topic. This study investigates the responses of GESC improved ground under vertical cyclic loading. A series of laboratory tests in a designed model test tank have been carried out with different loading parameters (varied loading amplitudes and frequencies), different column dimensions (varied encasement lengths and column diameters). In the tests, the soil-column stress distribution, accumulated settlement of loading plate, excess pore water pressure in the surrounding soil and lateral bulging of the stone column are monitored. Experimental results indicate that the vertical stress on the stone column increases with the increment of encasement length, and decreases with the increment of column diameter, loading amplitude and loading frequency. The increasing stress on the surrounding soil leads to a greater accumulated settlement of the loading plate and excess pore water pressure, while the increasing stress on the column leads to larger lateral bulging of the column. Excess pore water pressure dissipates effectively through vertical and horizontal drainage channels provided by the stone column and the sand bed. The geosynthetic encasement prevents the clay from obstructing the drainage channel by filtration and guarantees the drainage effect.

中文翻译：

---

软粘土土工合成材料围护石柱竖向循环荷载响应

摘要 土工合成材料围护石柱（GESC）支护路堤在交通荷载作用下的动力响应已成为一个热门话题。本研究调查了 GESC 改良地面在垂直循环荷载下的响应。在设计的模型试验罐中进行了一系列实验室测试，使用不同的加载参数（不同的加载幅度和频率）、不同的柱尺寸（不同的外壳长度和柱直径）。试验中监测土柱应力分布、加载板累积沉降、周围土体超孔隙水压力和石柱横向膨胀。试验结果表明，石柱上的竖向应力随着包覆长度的增加而增加，随着柱径的增加而减小，加载幅度和加载频率。周围土体应力的增加导致加载板的更大累积沉降和超孔隙水压力，而柱子上的应力增加导致柱体更大的侧向鼓胀。多余的孔隙水压力通过石柱和沙床提供的垂直和水平排水通道有效消散。土工合成材料包覆防止粘土通过过滤堵塞排水通道，保证排水效果。多余的孔隙水压力通过石柱和沙床提供的垂直和水平排水通道有效消散。土工合成材料包覆防止粘土通过过滤堵塞排水通道，保证排水效果。多余的孔隙水压力通过石柱和沙床提供的垂直和水平排水通道有效消散。土工合成材料包覆防止粘土通过过滤堵塞排水通道，保证排水效果。