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（1 漢嘉設(shè)計(jì)集團(tuán)股份有限公司， 杭州 310005；2 浙江大學(xué)濱海和城市巖土工程研究中心， 杭州 310058；3 浙江大學(xué)寧波理工學(xué)院土木建筑工程學(xué)院，寧波 315100；4 浙江理工大學(xué)建筑工程學(xué)院，杭州 310018）

［摘要］根據(jù)某續(xù)建工程樁筏基礎(chǔ)加固方案的設(shè)計(jì)實(shí)踐，利用ABAQUS軟件建立了具有代表性的筏板-樁-土共同作用的三維有限元分析模型，分析了補(bǔ)樁樁長(zhǎng)、補(bǔ)樁樁身強(qiáng)度和加固筏板厚度對(duì)樁筏基礎(chǔ)的內(nèi)力及變形特性的影響。分析結(jié)果表明：補(bǔ)樁樁長(zhǎng)對(duì)筏板的沉降、彎矩均有較大的影響；補(bǔ)樁樁身強(qiáng)度對(duì)筏板沉降及原有樁的樁頂反力影響較小；加固筏板厚度的增大對(duì)筏板調(diào)節(jié)差異沉降和均衡原有樁筏系統(tǒng)內(nèi)力有利，但同時(shí)也會(huì)導(dǎo)致整個(gè)筏板的自重增大、沉降增大。將樁頂反力和筏板應(yīng)力的數(shù)值計(jì)算結(jié)果與實(shí)測(cè)結(jié)果進(jìn)行了比較分析，兩者較為吻合。

［關(guān)鍵詞］樁筏基礎(chǔ); 筏板-樁-土共同作用; 數(shù)值分析; 內(nèi)力特性; 變形特性

分類(lèi)號(hào)：TU473.1       文獻(xiàn)標(biāo)識(shí)碼：A       文章編號(hào)：1002-848X(2014)16-0091-05

Analysis on internal force and deformation characteristics of piled raft foundation of a continued project

Cen Zhengping1, Wang Guohua2,3, Xie Xinyu2,3, Ye Jun1, Liu Kaifu4, Zheng Lingwei2, 3

 (1 Hanjia Design Group Co., Ltd., Hangzhou 310005, China; 2 Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 3 School of Civil Engineering and Architecture, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China; 4 College of Civil Engineering and Architecture,jiang Sci-Tech University, Hangzhou 310018, China)

Abstract: According to the reinforcement design practice for the piled raft foundation of a continued project, the three-dimensional finite element analysis model considering typical raft-pile-soil interaction was established by using ABAQUS software. The influences of the length and strength of supplementary pile and raft thickness on internal force and deformation characteristics of piled raft foundation were discussed. The results show that the length of supplementary pile has a great impact on the settlement and bending moment of the raft. The strength of supplementary piles has less effect on the settlement of the raft and the reaction force at the top of original pile. The increasing thickness of the raft, which brings positive effects on the adjustment of uneven settlement and internal forces of original piled raft foundation, increases the self-weight and settlement of the raft. The calculated results and field measured results on the reaction forces at the top of the pile and the stress of raft are in good agreement by comparing and analysis.

Keywords: piled raft foundation; raft-pile-soil interaction; numerical analysis; internal force characteristic; deformation characteristic

作者簡(jiǎn)介：岑政平，碩士，高級(jí)工程師，Email: yjhz0706@sina.com。

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