Lateral stability analysis of wedged geomembrane tubes using PFC^2D

Theoretical analyses and design methods of geosynthetic tubes

“…使用离散元法模拟土工膜管袋的袋体结构，可 以有效消除颗粒间弯矩的影响，更加真实地模拟土 工膜结构在充灌压力和侧向水压力共同作用下的几 何形状、受力特点及稳定状态。采用 PFC 2D [32] 建立 的初始几何模型如图 14 所示。计算过程中，取充 灌液体的重度为 1.0；土工膜管袋的周长为 1.0， 颗粒重度为 1.4。支挡结构由相同粒径的圆盘构成 并约束所有位移，地基采用刚性墙，颗粒间采用线 性接触刚度模型以及点接触连接模型，可以消除弯 矩对结果的影响。地基与土工膜管袋间的摩擦系数 为 0.40 [28] ，忽略颗粒间的摩擦。选用的模型归一化 参数详见表。 表表 模型参数取值 [33] . (a) 初始几何模 型; (b) 面荷载转换为点荷载 Figure 14 Numerical modeling of wedged geomembrane tube in PFC 2D [33] . (a) initial grid of geomembrane tube and foundation; (b) method of transform hydraulic pressures to point loads.…”

Optimized Design for Large Geotextile Mats over Soft Soil

“…It was found that riprap protection offered the maximum improvement to the overall performance of the stability of the geotextile tube embankment system. Sun et al [14] investigated the impact of two types of wedges on the lateral stability of geomembrane tubes with PFC 2d and provided the optimize shape and size of the wedge.…”

Overturning stability of supported geomembrane tube for flood control

“…The particle flow code (PFC 2D ) can serve as an alternative method to analyse the geomembrane tube, which can get rid of the influence of the bending moment on the results. Based on PFC 2D , the stability of wedged geomembrane tube and L-shaped geomembrane tube in retaining water have been investigated (Sun, Yue, and Guo, 2017;Sun, Qi, Gao, Guo, and Zhang,2019), which found that the L-shaped block was better than other structural types in the retaining water process. In the above studies, the water-retaining performance of the geomembrane tube system is usually studied under the condition that the support structure is fixed.…”