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浙江大学学报(工学版)
浙江大学学报(工学版)
土木工程     
砼芯水泥土搅拌桩复合地基工作特性分析
王驰, 徐永福, 叶冠林
上海交通大学 船舶海洋与建筑工程学院,上海 200240
Analysis of work characteristics of concrete-cored DCM pile composite foundation
WANG Chi, XU Yong-fu, YE Guan-lin
School of Naval Architecture, Ocean and  Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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摘要：

针对砼芯水泥土搅拌桩复合地基工作特性较为复杂的问题,基于砼芯水泥土搅拌桩(DCM)复合地基载荷板试验,采用弹塑性有限元方法,讨论不同芯长比和含芯率条件下砼芯水泥土搅拌桩复合地基的荷载传递、承载力和沉降变化规律.计算结果表明:随着芯长比的增加,越来越多的上部荷载集中至砼芯,同时桩周土体上的竖向应力减小；水泥土搅拌桩外壳在上部与桩周土和砼芯共同承担竖向荷载,随着桩体入土深度的增加变为负责传递砼芯与桩周土之间的剪应力；砼芯长度控制了桩土侧摩阻力的发挥长度,而且使得桩土侧摩阻力沿深度均匀发挥；芯长比和含芯率对于砼芯水泥土搅拌桩复合地基承载力的影响是相互的,选择合适的芯长比和含芯率组合,能最大限度地发挥砼芯水泥土搅拌桩桩复合地基的承载力.
Abstract:

Aiming at the complex  working characteristics of concrete-cored deep cement mixing (DCM) pile composite foundation  based on the results of plate load tests on concrete-cored DCM pile composite foundation, the elastoplastic finite element method was used to analyze the load transfer mechanism,settlement and bearing capacity characteristics of concrete-cored DCM pile composite foundation with different core-column length ratio and core ratio. The calculation results show that, with the increase of core-column length ratio and core ratio, the vertical stress on precast core pile and surrounding soil increase and decrease, respectively. The overburden load is shared by precast core pile, DCM column socket and surrounding soil. The main role played by DCM column socket in the composite pile system is to transfer shear stress from precast core piles to surrounding soil. The depth of skin friction between surrounding soil and DCM column socket is controlled by the length of precast core pile. The distribution of skin friction between surrounding soil and DCM column socket is uniform along depth with the effect of precast core pile. Both the core-column length ratio and the core ratio play an important effect on the bearing capacity of concrete-cored DCM pile composite foundation. The bearing capacity of concrete-cored DCM pile composite foundation can be improved by the suitable combination of core-column length ratio and core ratio．
出版日期: 2014-09-01
:  TU 447  
基金资助:

国家自然科学基金资助项目（41272318）
通讯作者: 徐永福，男，教授     E-mail: yongfuxu@sjtu.edu.cn
作者简介: 王驰(1986-)，男，博士生，从事复合地基沉降及承载力方面的研究.E-mail: chi-wang1986@hotmail.com
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引用本文:

王驰, 徐永福, 叶冠林. 砼芯水泥土搅拌桩复合地基工作特性分析[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2014.09.010.

WANG Chi, XU Yong-fu, YE Guan-lin. Analysis of work characteristics of concrete-cored DCM pile composite foundation. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2014.09.010.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2014.09.010    或    http://www.zjujournals.com/eng/CN/Y2014/V48/I9/1610

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