竖向荷载下土工袋的有限元数值模拟

Numerical simulation of a soilbag under vertical loads by FEM

利用有限元数值模拟方法,研究土工袋在竖向荷载下的变形、孔隙水压力、应力及袋子张力。土工袋由土体和编织袋2种材料组成,土体采用修正剑桥本构模型,编织袋采用改进的两节点张拉杆单元模拟。计算结果表明,竖向荷载下土工袋的最大水平位移和竖向位移分别发生在土工袋两侧边缘和土工袋表层,孔隙水压力随加载时间先增长后消散,同时,袋子的平均张力与荷载呈近似线性关系。

The finite element method （FEM） was used to study the deformation, pore pressure, stress, and bag tension of a soilbag under vertical loads. The soilbag was composed of the soil modeled by a modified Cam-Clay constitutive relationship, and a woven bag modeled by a modified two-node beam element. The simulation results show that the largest horizontal displacement occurred on both sides of the soilbag, while the largest vertical displacement took place on the surface of the soilbag. The pore pressure increased initially, and then decreased with the increase of loading time. In addition, the average tension of the bag was approximately linearly correlated with the loads.