粗糙度对红黏土与混凝土接触面循环剪切特性的影响

成浩 王晅 张家生 王启云

doi:10.3969/j.issn.1000-565X.2018.04.020

华南理工大学学报(自然科学版) >

2018 , Vol. 46 >Issue 4: 146 - 152

DOI: https://doi.org/10.3969/j.issn.1000-565X.2018.04.020

土木建筑工程

粗糙度对红黏土与混凝土接触面循环剪切特性的影响

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1．中南大学土木工程学院，湖南长沙 410075; 2．高速铁路建造技术国家工程实验室，湖南长沙 410075; 3．福建工程学院土木工程学院，福建福州 350108

成浩( 1990-) ，男，博士生，主要从事土与结构的相互作用研究

收稿日期: 2017-06-29

修回日期: 2018-01-11

网络出版日期: 2018-03-01

基金资助

国家自然科学基金资助项目( 51508097) ;湖南省自然科学基金资助项目( 2017JJ2314) ; 中南大学研究生创新项目( 2016zzts077)

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Effects of Ｒoughness on Cyclic Shear Behavior of Ｒed Clay-Concrete Interface

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1． School of Civil Engineering，Central South University，Changsha 410075，Hunana，China; 2． National Engineering Laboratory for High-Speed Ｒailway Construction，Changsha 410075，Hunan，China; 3． College of Civil Engineering，Fujian University of Technology，Fuzhou 350108，Fujian，China

成浩( 1990-) ，男，博士生，主要从事土与结构的相互作用研究

Received date: 2017-06-29

Revised date: 2018-01-11

Online published: 2018-03-01

Supported by

Supported by the National Natural Science Foundation of China( 51508097) and the Natural Science Foundation of Hunan Province( 2017JJ2314)

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摘要

为了研究结构表面粗糙度对土与结构接触面循环剪切特性的影响，采用大型直剪仪进行了不同粗糙度与不同法向应力条件下红黏土与混凝土接触面的循环剪切试验，分析粗糙度对接触面循环剪切应力与剪切体变的影响规律．试验结果表明:不同条件下接触面都呈现出循环剪切软化特征，同一循环周次接触面剪切强度随粗糙度的增大而增大; 循环剪切过程中接触面表现出明显的剪缩特征，接触面最终剪缩量随粗糙度的增大而增大．随着循环次数的增加，接触面剪切刚度和阻尼比逐渐减小并趋于稳定．结构表面粗糙度的增大能提高接触面剪切刚度，但对接触面阻尼比的影响不明显．

关键词： 接触面; 粗糙度; 循环剪切; 剪切刚度; 阻尼比; 混凝土; 红黏土

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成浩王晅张家生王启云 . 粗糙度对红黏土与混凝土接触面循环剪切特性的影响[J]. 华南理工大学学报(自然科学版), 2018 , 46(4) : 146 -152 . DOI: 10.3969/j.issn.1000-565X.2018.04.020

Abstract

In order to investigate the influence of surface roughness of structure on cyclic shear behavior of soilstructure interface，a series of large scale cyclic direct shear tests were performed for red clay-concrete interface．

The effect of roughness of concrete surface and normal stress were investigated on cyclic shear behavior of clay-con

crete interface． The results indicate that the phenomena of cyclic shear softening is significant on red clay-concrete interface due to cyclic loading，and that the shear strength of interface increases with the roughness being incremented; An obvious contraction of interface was observed during the process of cyclic shear under different conditions，

and the maximum value of contraction increases with the increment of roughness． Shear stiffness and damping ratio

of interface decrease with rising number of cycles and tend to a steady value at the end of cyclic tests． The increase of roughness can improve shear stiffness of interface，but produces little influence on damping ratio of interface．

Key words： interface; roughness; cyclic shear; shear stiffness; damping ratio; concrete; red clay

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