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FLAC3D有限元软件内置4种渗流模型,直接决定计算结果正确与否。渗流场在三维空间中分布复杂,难以根据计算公式定量选用何种模型,不同文献渗流模型选择标准也不相同。为了找到简单、快速、合理的选择方法,有必要对4种渗流模型进行受力分析。以一100 m×100 m×10 m各项同性弹性立方体为例,基于4种渗流模型设计4种工况。通过对比和分析各工况下总应力和孔隙水压分布情况,主要结论如下:1)模型A、模型C外荷载均由土颗粒骨架承担,其余2种模型流体也参与受力;2)流体分担外荷载的比例与刚度系数和时间有关;3)FLAC3D流固耦合过程正是通过调整刚度比、打开和关闭力学-流体进程来实现的。目前我国流固耦合计算基本基于FLAC3D有限元软件,文中结论适用于基础、隧道、基坑等工程,可供相关从业人士借鉴参考。
FLAC3D finite element software built-in four kinds of seepage model, directly determine the calculation result is correct or not. The seepage field is complicatedly distributed in three-dimensional space, it is difficult to quantitatively select which model according to the calculation formula, and the selection criteria of seepage model in different documents are also different. In order to find a simple, rapid and reasonable selection method, it is necessary to analyze the stress of four kinds of seepage models. Taking all isotropic elastic cubes of 100 m × 100 m × 10 m as an example, four working conditions are designed based on four kinds of seepage models. By comparing and analyzing the distribution of total stress and pore water pressure under various working conditions, the main conclusions are as follows: 1) The loads of model A and model C are all assumed by the soil particle skeleton, and the other two kinds of model fluids are also involved in the stress; 2) The proportion of load sharing is related to the stiffness coefficient and time. 3) FLAC3D fluid-solid coupling process is achieved by adjusting the stiffness ratio, opening and closing mechanics-fluid processes. At present, the calculation of fluid-solid coupling in China is basically based on the FLAC3D finite element software. The conclusions in this paper are applicable to the foundations, tunnels, foundation pit and other projects, and can be used for reference by relevant practitioners.