Abstract The geotextile encased stone column has been numerically modeled with the DEM gravel specimen wrapped by the finite-element shell structure. The irregular shape and size distribution of gravels have been simulated according to the experimental data using the rigid block module in PFC. The geotextile encasement has been modeled using the geogrid elements in FLAC3D. The complete stress–strain behaviors of the geotextile encased stone column under the uniaxial compression are successfully predicted and show good agreement with experiments. The failure of the encased stone column is controlled by the geotextile encasement, which might be raptured due to the column expansion and stabbing from irregularly shaped gravels. Without considering the stress concentration effect, the continuum-based models overestimate the bearing capacity of the geotextile encased stone column.

中文翻译：

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单轴压缩试验下土工布包裹石柱的 3D 离散元模拟

摘要 采用有限元壳结构包裹的DEM砾石试件对土工布包裹的石柱进行数值模拟。使用PFC中的刚性块模块根据实验数据模拟了砾石的不规则形状和尺寸分布。土工织物外壳已使用 FLAC3D 中的土工格栅元素进行建模。单轴压缩下土工布包裹石柱的完整应力-应变行为被成功预测，并与实验显示出良好的一致性。包覆石柱的破坏是由土工布包覆控制的，土工布包覆可能会因柱子膨胀和形状不规则的砾石刺伤而被破坏。不考虑应力集中效应，