软土地基上模袋砂围堤稳定性分析

Analysis of stability of dykes with fabriform sand on soft foundation

模袋砂围堤存在模袋与模袋之间及砂与模袋之间的摩擦,并具有模袋横纵向拉力相异的特点,为此,在三维有限元方法和试验结果的基础上,对模袋砂围堤的稳定性及其影响因素进行了仿真分析。研究结果表明:模袋砂围堤整体安全系数随着土工织物——模袋抗拉强度及袋内填充土体强度参数的增大显著增加;随着模袋充填厚度增大,围堰整体安全系数迅速降低并趋于稳定。

In dykes with fabriform sand, friction often exists between two adjacent geotextile bags and between a geotextile bag and the sand, and the transverse tension and the longitudinal tension of the geotextile bag are anisotropic. Based on these characteristics, a three-dimensional finite element method was used to simulate a dyke with fabriform sand, and the experimental data were adopted to analyze the stability of the dyke and its influencing factors. The results show that the integral safety factor increased significantly as the tensile strength of the geotextile bags and the filled soil strength increased. As the depth of the filled soil increased, the integral safety factor decreased rapidly at first, and then tended to become stable.