Abstract A series of centrifuge model tests were carried out to investigate the performance of geosynthetic-encased stone columns (GESCs) supported embankment under undrained condition. The influence of stiffness of encasement, basal reinforcement and embankment loading on the deformation behavior of GESCs were also assessed. The centrifuge test results reveal that under undrained condition, compared to ordinary stone column (OSC) supported embankment, the settlement of column has reduced by 50% and 34% when columns were encased with high and low stiffness geogrids respectively. Moreover, under identical embankment loading condition, the stress concentration ratio has increased significantly upon inclusion of basal reinforcement in the GESCs supported embankment. In case of OSCs supported embankment, columns experiences bulging in the top portion, inward bending in the central portion and a noticeable shear at the bottom portion. However, when columns were encased with geogrid layer, bulging in the top portion was significantly reduced but the inward bending of columns were noticed. With the inclusion of basal reinforcement, bending curvature of columns increases thereby inducing higher settlement in columns and relatively lesser settlement in surrounding soil. The differential settlement between the encased column and the surrounding soil under embankment loading has been considerably reduced with the inclusion of basal reinforcement.

中文翻译：

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土工合成材料围护石柱支护路堤不排水条件下变形行为的离心模型试验

摘要 为研究土工合成材料包裹石柱(GESCs)支护路堤在不排水条件下的性能，开展了一系列离心模型试验。还评估了外壳刚度、基础加固和路堤载荷对 GESC 变形行为的影响。离心机试验结果表明，在不排水条件下，与普通石柱（OSC）支护路堤相比，柱子分别用高刚度和低刚度土工格栅包裹时，柱的沉降分别降低了50%和34%。此外，在相同的路堤加载条件下，在 GESCs 支持的路堤中加入基础钢筋后，应力集中率显着增加。在 OSCs 支持的路堤的情况下，柱子会在顶部膨胀，中部向内弯曲，底部有明显的剪切。然而，当柱子用土工格栅层包裹时，顶部的鼓胀明显减少，但注意到柱子向内弯曲。随着基础钢筋的加入，柱的弯曲曲率增加，从而导致柱中较高的沉降和周围土壤中相对较少的沉降。在路堤荷载作用下，包围柱与周围土壤之间的差异沉降已大大减少，包括基础钢筋。随着基础钢筋的加入，柱的弯曲曲率增加，从而导致柱中较高的沉降和周围土壤中相对较少的沉降。在路堤荷载作用下，包围柱与周围土壤之间的差异沉降已大大减少，包括基础钢筋。随着基础钢筋的加入，柱的弯曲曲率增加，从而导致柱中较高的沉降和周围土壤中相对较少的沉降。在路堤荷载作用下，包围柱与周围土壤之间的差异沉降已大大减少，包括基础钢筋。