As a new type of soft ground treatment technology, the geosynthetic-encased stone column (GESC) has been extensively used in engineering of roads and highways. In order to investigate the bearing mechanism of GESCs under cyclic loading, a series of experiments and numerical simulations were carried out using the proportional model. This paper described these changes in settlement and pile-soil stress ratio with emphasis on the ratio of length to diameter and the strength of wrapping material. Under the background of model test, a GESC reinforced composite foundation was simulated by the particle flow method. The reliability of the numerical simulation results was verified by the test results. The results demonstrate that GESC can effectively reduce the settlement of composite foundation. As the ratio of length to diameter and the strength of the wrapping material increase, this reduction is more significant. The GESC can effectively decrease the soil stress in composite foundation. The simulation results show the behavior of load transfer and expansion in GESC reinforced composite foundation. The displacement vector of soil particles in composite foundation shows that the failure mode of soil is shear failure. As the number of cycles increases, the range of failure surface expands.

作为一种新型的软土地基处理技术，土工合成材料包裹的石柱（GESC）已广泛用于道路和高速公路的工程设计中。为了研究循环荷载作用下GESC的承载机理，利用比例模型进行了一系列实验和数值模拟。本文描述了沉降和桩土应力比的这些变化，重点是长径比和包裹材料的强度。在模型试验的背景下，采用颗粒流法模拟了GESC增强复合地基。试验结果验证了数值模拟结果的可靠性。结果表明，GESC可以有效减少复合地基的沉降。随着长度与直径的比以及包装材料的强度的增加，这种减少更为显着。GESC可以有效地减轻复合地基中的土壤应力。仿真结果表明了GESC增强复合地基的荷载传递和扩展行为。复合地基中土壤颗粒的位移矢量表明，土的破坏模式为剪切破坏。随着循环次数的增加，失效表面的范围会扩大。复合地基中土壤颗粒的位移矢量表明，土的破坏模式为剪切破坏。随着循环次数的增加，失效表面的范围会扩大。复合地基中土壤颗粒的位移矢量表明，土的破坏模式为剪切破坏。随着循环次数的增加，失效表面的范围会扩大。