土工袋无侧限压缩试验有限元数值模拟

土工袋作为一种袋装新材料的研究主要集中在室内试验方面,而数值模拟研究较少。为此,首先进行土工袋无侧限压缩试验,得到轴向压力—轴向位移关系曲线及对应的极限抗压强度。在此基础上,运用Abaqus有限元软件进行土工袋三维建模,模拟了土工袋无侧限压缩试验,土体采用摩尔库伦本构关系,袋子采用线弹性理想塑性模型,采用动态约束法模拟袋子与土体接触。结果表明,极限抗压强度模拟值与理论、试验值基本一致,袋内土体主要以侧向移动为主,沿边缘向中心袋子应力逐渐增大,土体应力逐渐减小。

Numerical Analysis of Soilbag Unconfined Compression Test by FEM

As a new bagged material, the current study of soilbag focuses on indoor test and it is less of numerical analysis. Soilbag unconfined compression test was carried out to get the relationship curve of axial pressure & displacement and the corresponding ultimate compressive strength. And then FEM software Abaqus was used to establish three dimensional model for simulation of soilbag unconfined compression test. The Mohr Coulomb constitutive relation is used to represent the soil behavior. The bag is represented by a linear elastic plastic model. The soil bag interface is modeled with contact dynamic constraints. The results show that the simulation compressive strength is basically consistent with the theoretical and experimental value. The soils inside the bag move laterally; along the edge to the center of soilbag, the stress of bag increases and the stress of soil decreases gradually.