群桩复合地基固结性状有限元分析

Analysis of Consolidation Behavior of Composite Ground with Piles by FEM

在编制并验证Biot固结有限元程序的基础上,对群桩复合地基的固结变形及应力特性进行了数值模拟,并和单桩复合地基、天然地基进行了比较分析。强排水群桩和单桩复合地基的固结特性差别不大;但弱排水群桩和单桩复合地基固结度曲线的差异非常明显,群桩复合地基固结速度始终快于单桩复合地基。在桩体打穿地基的情况下,强排水和弱排水群桩复合地基的固结速度都较天然地基固结速度快;但和单桩相比,弱排水群桩复合地基加速地基固结的作用并不是特别显著。

The programming and validating FEM code of Biot consolidation theory are. used for analysis of the consolidation of composite ground with piles, and the consolidation behavior of the single pile composite ground and natural ground is compared. For composite ground with strong drainage pile, the difference of consolidation behavior between composite ground with single pile and composite ground with piles is small. While the consolidation rates of composite ground with weak drainage piles is quicker than that of composite ground with single weak drainage pile. The consolidation rates of penetrated composite ground both with weak drainage piles and with strong drainage piles are quicker than that of natural ground, and the former is more obvious than the latter.