流固耦合与非流固耦合在深基坑模拟中的对比分析

在深基坑支护结构的设计与计算分析中,地下水的影响是一个极为重要的课题。现有的计算模型较为常用的为流固耦合模型和非流固耦合模型。以某基坑工程开挖与支护为研究对象,运用ABAQUS软件,分别用流固耦合与非流固耦合计算,分析了基坑开挖过程中的结构与土体变形特点,以及流固耦合模型中降水时的孔隙水压力变化情况。与不考虑水作用的非流固耦合模型相比,考虑水压力作用以及流动的流固耦合计算模型的土体与结构变形值趋势一致,但计算结果偏大,流固耦合模型能反映出基坑降水作用的机理与效果,因此应尽量采用流固耦合的方法进行计算与分析。

Comparative Analysis on Fluid Solid and Non-fluid Solid Coupling in Deep Excavation Simulation

In design and calculation of supporting structure for deep excavation, the impact of groundwater is an important subject. The current calculation models commonly used are fluid solid coupling model and non-fluid solid coupling model. Taking the construction and supporting in an excavation as the study object, this paper made the calculation with ABAQUS software by fluid solid and non-fluid solid models respectively, as well as analyzed the deformation characteristics of the structure and soil mass during the excavation and the change of pore water pressure when dewatering in the fluid solid coupling model. Compared with the non-fluid solid coupling model not considering the action of water, the fluid solid coupling model, which takes the action of water pressure and flow into account, has the deformation of soil and structure trend to be uniform, but relatively large result. The fluid solid coupling model may reflect the mechanism and effect of dewatering, and should be tried to be used in the calculation and analysis.