铁道科学与工程学报Issue(4)：795-800,6.
红黏土-混凝土光滑接触面直剪试验研究
Experimental study of mechanical behaviour of red clay soil -concrete s mooth interface by direct shear test
摘要
Abstract
This paper utilized the large direct shear apparatus for soil and concrete interface stress and strain characteristics research.The smooth interface shear deformation characteristics under the condition of different normal stresses were investigated and the appropriate shear constitutive model was built.Experimental results show that the relationship curve between the τand δis peak type,but with the increase of normal stress,peak value trending down.Smooth interface shear strength accords with Mohr -Coulomb failure strength theory,the contact surface cohesion and friction angle is smaller than red clay.The cause of the shear failure surface oc-curred in the contact surface.Based on research of the dilatancy and shrinkage characteristics of smooth inter-face,it is found that there exists a critical normal stress which distinguishes shear dilatancy and shrinkage of soil.Moreover,corresponding method for calculating the critical normal stress was proposed.Discussing the di-rect shear test method for determining the model parameter of hyperbola,and found out the suitable hyperbolic parameter.Then any hyperbolic model parameters under a range of normal stress can be obtained through the model.关键词
光滑接触面/抗剪强度/本构模型/红黏土/直剪试验Key words
smooth interface/shear strength/constitutive model/red clay/direct shear test分类
建筑与水利引用本文复制引用
曾维德,张家生,龙尧..红黏土-混凝土光滑接触面直剪试验研究[J].铁道科学与工程学报,2015,(4):795-800,6.基金项目
国家自然科学基金资助项目（51378514）；湖南省自然科学基金资助项目 （）
