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在含水率大、承载能力低的软土地基上,利用充灌砂袋进行挤淤置换的方法工艺简单、施工方便、处理效果明显,已经广泛地应用在建造围埝和修筑道路中。充灌袋下沉到一定深度后,其重量与地基承载力相等,从而达到极限平衡状态。充灌袋挤淤所达到的深度与其高度存在一定的对应关系,在工程中确定此关系十分重要。通过3组不同宽度的挤淤模型试验,得到充灌袋下沉量与充灌袋高度的曲线关系、淤泥的位移特性及隆起量。利用ABAQUS中耦合欧拉-拉格朗日法(CEL法),将充灌袋和淤泥分别用拉格朗日体和欧拉体描述,模拟充灌袋挤淤下沉的过程,将模拟得到的充灌袋下沉深度和高度的关系、淤泥的位移特点与试验结果以及理论公式进行对比。结果表明,CEL法模拟得到的结果与试验结果、理论解具有很好的吻合性,说明利用CEL法可以较好地模拟充灌袋的挤淤问题。
On the soft soil foundation with large water content and low bearing capacity, the method of squeezing silt replacement by filling sand bags is simple in technology, convenient in construction and obvious in treatment effects, and has been widely used in the construction of enclosures and roads. After the filling bag sinks to a certain depth, its weight is equal to the bearing capacity of foundation so as to reach the limit equilibrium state. There is a certain correspondence between the depth reached by filling bags and silting, and it is very important to confirm this relationship in the project. The curves of the sinking amount of filling bags and the height of filling bags were obtained through the test of three groups of silt-crowding model with different widths. The displacement characteristics and uplift amount of the silt were obtained. Using the coupled Euler-Lagrange method (CEL method) in ABAQUS, the filling bags and silt were described by Lagrangian and Eulerian, respectively, to simulate the sinking process of filling bags. The simulation results The relationship between the sinking depth and height of the filling bags, the displacement characteristics of the silt and the experimental results as well as the theoretical formula are compared. The results show that the results obtained by the CEL method are in good agreement with the experimental and theoretical results, which shows that the CEL method can simulate the silting problem of filling bags.