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(1 寧波市建筑設(shè)計研究院  315012； 2 浙江大學巖土工程研究所  杭州 310027)
【提要】  在編制并驗證Biot固結(jié)有限元程序的基礎(chǔ)上，對群樁復合地基的固結(jié)變形及應(yīng)力特性進行了數(shù)值模擬，并和單樁復合地基、天然地基進行了比較分析。強排水群樁和單樁復合地基的固結(jié)特性差別不大；但弱排水群樁和單樁復合地基固結(jié)度曲線的差異非常明顯，群樁復合地基固結(jié)速度始終快于單樁復合地基。在樁體打穿地基的情況下，強排水和弱排水群樁復合地基的固結(jié)速度都較天然地基固結(jié)速度快；但和單樁相比，弱排水群樁復合地基加速地基固結(jié)的作用并不是特別顯著。
【關(guān)鍵詞】  復合地基  單樁  群樁  固結(jié)  有限元
Analysis of Consolidation Behavior of Composite Ground with Piles by FEM/Xu Yang1,Xie Kanghe2,Xu Guoping1,He Libo1(1 Ningbo Architectural Design and Research Institute,Ningbo 315012,China; 2 Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310027,China)
Abstract: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.
Keywords:composite ground; single pile; piles; consolidation; FEM