吸湿环境下膨胀土与桩接触面强度特性试验研究

刘涛; 王勇; 孙吉主; 李雄威

doi:10.11779/CJGE2015S1031

吸湿环境下膨胀土与桩接触面强度特性试验研究 English Version

1. 武汉理工大学土木工程与建筑学院,湖北武汉 430070; 2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071; 3. 常州工学院常州市建设工程结构与材料性能研究重点实验室,江苏常州 213002

基金项目: 国家自然科学基金项目（41102229）; 湖北省自然科学基金; 项目（2011CDB407）

详细信息

作者简介:
刘涛(1987- ),男,硕士研究生,研究方向为软土地基处理。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Experimental study on pile-soil interface strength of expansive soil under environemt of moisture absorption

1. School of Civil and Architectural Engineering, Wuhan University of Technology, Wuhan 430070,China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3.Changzhou Key Laboratory of Structure Engineering and Material Properties, Changzhou Institute of Technology, Changzhou 213002, China

摘要

摘要: 为探讨水分迁移条件中,土质特性对膨胀土地基中桩-土接触面的影响规律,以广西南宁中强膨胀土为研究对象,针对大气环境作用对膨胀土宏微观特性的影响,进行原状土体强度与接触面强度的对比试验研究。结果表明：吸湿环境下,含水率对土体强度的影响比对接触面强度的影响显著,原状膨胀土和桩-土接触面的黏聚力均随含水率的增加而减小,而含水率增加引起土体摩擦角减小的影响远大于桩-土接触面;接触面的摩擦角始终大于土体内摩擦角,受含水率变化影响不大;当膨胀土吸湿临近饱和含水状态时,桩-土接触面的强度与原状土体强度近似相等。利用回归分析,得出了用土体强度参数表征的桩-土接触面抗剪强度关系表达式。利用该式,能够对吸湿环境下原状膨胀土与结构接触界面的强度进行预测分析。
- 膨胀土 /
- 桩-土接触面 /
- 吸湿 /
- 抗剪强度
Abstract: Based on the effects of atmospheric enviroment on macro-microcharacteristics of expansive soil, the comparative tests on shear strength characteristics between the undisturbed soil and the pile-soil interface were carried out on the middle expansive soil in Nanning area, Guangxi in order to investigate the infulence rules of variation of soil properties on behaviours of the pile-soil interface in expansive soil foundation under the environment of moisture migration. The results show that the moisture content has more significant impact on the strength of expansive soil than that of the pile-soil interface in path of the moisture absorption. The cohesive strengths of both the soil and the interface decrease with the increase of water content, and the effect on the decrease of friction angle of expansive soil is much greater than that of pile-soil interface. The friction angle of the interface is always larger than that of the soil, and less affected by changes in moisture content. When the water content of expansive soil is close to the saturation, the strength of pile-soil interface is approximately equal to that of the soil. Through regression analysis, a relational expression for the shear strength of pile-soil interface is obained by the dicription of strength parameters of expansive soil. Correspondingly, the strength of pile-soil interface in expansive soil foundation can be predicted by using the soil strength under the environment of natural moisture absorption.
- expansive soil /
- pile-soil interface /
- moisture absorption /
- shear strength

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参考文献(8)

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