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工程地质学报  2018, Vol. 26 Issue (5): 1311-1317    DOI: 10.13544/j.cnki.jeg.2018168
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基于湛江组结构性黏土的桩土接触面模型及解析解
汤斌1, 殷建风1, 费建武2
1. 桂林理工大学, 土木与建筑工程学院 桂林 541004;
2. 武汉科技大学, 城市建设学院 武汉 430065
PILE-SOIL INTERFACE MODEL AND ANALYTICAL SOLUTION BASED ON STRUCTURAL CLAY OF ZHANJIANG GROUP
TANG Bin1, YIN Jianfeng1, FEI Jianwu2
1. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
2. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065
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摘要 湛江组结构性黏土因其特有的结构特性而使该土层中桩基承载性状复杂,传统的桩基设计计算理论和方法应用于该土层中桩基承载力计算时其理论计算值与工程实测值或多或少存在一定误差而存在适用性问题。基于湛江组结构性黏土直剪试验及无侧限抗压强度试验,在剪切位移法的基础上,提出了桩土接触面软化模型,即桩土接触面处于弹性阶段时,桩侧摩阻力随位移线性增加;桩土接触面处于软化阶段时,桩侧摩阻力随位移线性减小,且减小速率与土体灵敏度、桩土接触面法向压力有关;桩土接触面处于滑移阶段时,桩侧摩阻力不随位移变化。依据该模型推导了湛江组结构性黏土中竖向荷载作用下单桩位移及轴力解析解,并比较了计算与试验结果,验证了所提模型的合理性。
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汤斌
殷建风
费建武
关键词湛江组结构性黏土   桩基础   竖向承载力   剪切位移法   土体灵敏度     
Abstract: Due to the unique structural property of the structural clay of Zhanjiang group, the bearing capacity of pile is complex in the clay. If the traditional pile foundation design calculation theory and method are applied to calculate the bearing capacity of the pile foundation, the deviation between the theoretical calculation value and the measured value of the pile is more or less. Based on direct shear test and unconfined compression strength test of Zhanjiang group structural clay, as well as the shear displacement method, the model of softening of pile-clay interface is put forward. When the pile-soil interface is in the elastic stage, the side friction of pile increases linearly with displacement. In the stage of softening, the side friction of pile decreases linearly with the displacement. The reduction rate is related to the soil sensitivity and normal pressure of the pile-soil interface. In the stage of sliding, the side friction of pile can not change with the displacement. Therefore, the displacement and axial force analysis of single pile under the vertical load in Zhanjiang group structural clay are derived according to the proposed model. Furthermore, the calculation and test results are compared and the feasibility of the proposed method is verified.
Key wordsZhanjiang group structural clay   Pile foundation   Vertical bearing capacity   Shear displacement method   Soil sensitivity   
收稿日期: 2018-06-01;
基金资助:国家自然科学基金项目(41372299),广西岩土力学与工程重点实验室项目(2016-A-01),桂林理工大学博士科研启动基金资助
作者简介: 汤斌(1970-),男,博士,教授,从事地基与基础工程研究.Email:tangbinruocheng@163.com
引用本文:   
汤斌,殷建风,费建武. 基于湛江组结构性黏土的桩土接触面模型及解析解[J]. 工程地质学报, 2018, 26(5): 1311-1317.
TANG Bin,YIN Jianfeng,FEI Jianwu. PILE-SOIL INTERFACE MODEL AND ANALYTICAL SOLUTION BASED ON STRUCTURAL CLAY OF ZHANJIANG GROUP[J]. Journal of Engineering Geology, 2018, 26(5): 1311-1317.
 
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