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（1 淮陰工學(xué)院建筑工程系，淮安 223001； 2 南京工業(yè)大學(xué)土木工程學(xué)院，南京 210009）

［摘要］利用ABAQUS軟件對(duì)常規(guī)樁筏基礎(chǔ)（3d樁距）和復(fù)合樁基（6d樁距）進(jìn)行了三維彈塑性分析。利用無厚度接觸面單元模擬筏板-樁-土的非線性接觸特性，采用Mohr Coulomb彈塑性本構(gòu)模型描述土的非線性特性，樁取為彈性。得到了沉降、樁土荷載分擔(dān)比、樁周土體水平位移變化情況。分析結(jié)果表明，6d樁距群樁中基樁的承載能力很快發(fā)揮到極限，后續(xù)荷載交由承臺(tái)下土體承擔(dān)，有更多的天然地基承載表現(xiàn)，6d樁距群樁的樁間土繞樁滑動(dòng)的趨勢(shì)較3D樁距群樁的要強(qiáng)。分析結(jié)果基本反映了樁-土-筏的實(shí)際工作性狀，驗(yàn)證了復(fù)合樁基理論的正確性。

［關(guān)鍵詞］樁筏基礎(chǔ)；非線性；數(shù)值分析；沉降

Numerical analysis of behavior of pile-soil nonlinear interaction to composite pile foundation

Chen Yadong1，2, Zai Jinmin2, Qi Kejun2

(1 Department of Civil Engineering, Huaiyin Institute of Technology, Huaian 223001, China;

2 College of Civil Engineering, Nanjing University of Technology, Nanjing 210009, China)

Abstract:ABAQUS is used to give a 3d elastoplastic finite element analysis to piled raft foundation of 3d and 6d pile spacing. No thickness contact element is employed to simulate the nonlinear behavior of interaction of pile-soil. Mohr-coulomb elastoplastic constitutive model is used to represent nonlinear behavior of soil, and the pile is assumed to be elastic. Settlement, load sharing percent and horizontal displacement of the soil around the pile are got from the analysis. The analysis results indicate the load capacity of 6d spacing pile group quickly got the limit, then the other load was taken by the cap, which present more behave of nature ground. Sliping trend around pile of 6d spacing pile group is more strong than 3d spacing pile group. Analysis results reflect the practical work properties of pile-soil interaction, and validate the correctness of composite pile foundation.

Keywords:piled raft foundation；nonlinear behavior；numerical analyses；settlement

*國(guó)家自然科學(xué)基金資助項(xiàng)目（50578122）。