砼-土界面抗剪特性试验研究

利用改进的直剪装置对砂岩泥岩混合土料和不同粗糙表面的混凝土块进行直剪试验,观察土料变形特征,探究不同的界面粗糙度对砼-土界面剪切特性的影响。通过简化应力应变关系曲线的方法得出计算参数,利用峰值剪应力得出接触面抗剪性能,分析切向刚度系数k的意义。通过观察可以证实土体的基本变形阶段和破坏变形阶段的过程,即达到峰值剪应力前的基本变形过程,之后的破坏变形过程。结合试验现象对两个阶段的土体摩擦过程进行分析,即土体与结构物接触面的摩擦过程和土体与残余在结构物上的土体的摩擦过程。

Experimental study on the influence of concrete and soil interface roughness on shear strength

In this paper, by using the improved direct shear apparatus, the shear deformation characteristics and mechanical properties of the concrete with different roughness of sandstone-mudstone particle mixture with different roughness were studied.The calculation parameters were obtained by simplifying the stress strain curve. The shear strength of the contact surface was obtained by using the peak shear stress, and the significance of the tangential stiffness coefficient k was analyzed.There were the basic deformation stage and failure stages of soil deformation process through the observation, that the basic deformation process before peak shear stress and the deformation and failure process. Based on the experimental phenomenon, the friction process of the soil in the two stages was analyzed, that friction process of the contact surface between soil and structure and the friction process between soil and the residual soil.