苏州河河口水闸三维固结有限元计算

3D FEM ANALYSIS OF SLUICE ON SUZHOU RIVER BAYOU CONSIDERING SOIL CONSOLIDATION

对苏州河河口水闸的整体设计作了简要介绍,采用空间Biot非线性固结有限元模型,考虑地基的固结过程,在有关位置设置软弱化接触单元,计算分析了挡潮和挡河两种工况下地基的变形对水闸结构的影响、闸墩和混凝土沉箱闸底板随时间变化的变形规律以及基础桩受力等共同作用问题。计算结果表明:挡潮工况是控制工况;闸墩基础的沉降和桩的反力均随着土体的固结而增加,但差异沉降很小,角桩的反力大于内部桩的反力。这同时也说明该水闸的设计是巧妙而合理的,计算模型、相应计算参数是正确的。

Considering soil consolidation, the design of sluice on Suzhou River bayou is introduced, and the time-dependent interaction between pile, soil and structure under different operating conditions is analyzed by using 3D finite element method. Piles and structure are modeled as linear elements, and soils are modeled as nonlinear elements. Contacted interface elements are set between pile elements and soil elements. It is found that the counterforce of the piles and the settlement of the sluice raft both increase during soil consolidation. The differential settlement is very small, and the counterforce of corner piles is larger than that of middle piles. The calculation results show that the design of sluice, the model and parameters adopted for calculation are all rational.