铁道科学与工程学报Issue(3)：88-93,6.
循环荷载作用下红黏土与混凝土接触面剪切特性试验研究
Experi mental research on shearing property of red clay-concrete interface under cyclic loading
摘要
Abstract
The mechanical behavior of interface between red clay and concrete was investigated by direct shear tests of different normal stress and roughness under cyclic loading.The strength and deformation with the varia-tion of the number of cyclic loading were analyzed under different normal stress and roughness of the concrete surface.The experimental results show that the minimum or maximum value of shear stress in each cycle corre-sponded respectively to the maximum shear displacement and minimum shear displacement in the process of cy-clic shear.The maximum shear stress occurs at the first cycle,and with the increase of the cycle number,the maximum shear stress in each cycle gradually reduces and finally remains a constant.The maximum of the aver-age peak shear stress tend to increase with the increment of normal stress.The roughness has little effect on the average peak shear stress when normal stress is low,while with the increase of the normal stress,the roughness gradually comes into play.The cohesion and friction angle of the contact surface are large at the beginning of the cyclic shear test,and then decrease rapidly and finally tend to constant with the increment of cycle number. When the normal stress is low,the displacement of the sample has shear shrinkage at the first cycle,then shows shear dilation from the second cycle,and the dilatancy amount eventually remain stabile.However,with the in-creasing number of the normal stress,shear shrinkage appears,and the shrinkage magnitude eventually reaches a stable number.With the increase of normal stress and roughness,the shrinkage amount and rate of shear shrink-age also increase.关键词
红黏土/循环荷载/接触面/粗糙度/大型直剪试验Key words
red clay/cyclic loading/interface/roughness/large scale direct shear test分类
建筑与水利引用本文复制引用
石熊,张家生,邓国栋,孟飞,徐进,刘蓓..循环荷载作用下红黏土与混凝土接触面剪切特性试验研究[J].铁道科学与工程学报,2014,(3):88-93,6.基金项目
国家自然科学基金资助项目（51378514）；高速铁路建造技术国家工程实验室基金资助项目 （）
