【摘要】 为研究不同法向应力下接触面应力-位移及破坏强度等特征，采用大型直剪仪对红黏土与混凝土结构接触面进行剪切试验。基于扰动状态理论对接触面剪切过程进行分析，在传统两参数Weibull分布函数的基础上引入扰动阈值参数γd，构建考虑初始扰动位置影响的接触面剪切扰动本构模型，并对该模型进行验证与讨论。试验结果表明：不同条件下接触面应力-位移曲线表现出典型的剪切软化特性，且其黏聚力c和内摩擦角φ均小于红黏土自身；构建的模型可较好地预测接触面在高法向应力和大剪切位移条件下的剪切应力应变关系，扰动阈值参数γd的合理取值范围为（0.7～0.9）γp（峰值剪应变）。更多还原

【Abstract】 To investigate the stress-displacement characteristics and failure strength of the interface between red clay and concrete structures under different normal stresses, shear tests were conducted using a large direct shear apparatus. The shear process of the contact interface was analyzed based on the perturbation state theory. Building upon the traditional two-parameter Weibull distribution function, a perturbation threshold parameter γd was introduced to develop a constitutive model for the shear perturbation of the contact interface that considers the influence of initial perturbation positions. The model was validated and discussed. The experimental results reveal that the stress-displacement curves of the contact interface exhibites typical shear softening characteristics under various conditions, with both cohesion(c) and internal friction angle(φ) being smaller than those of the red clay alone. The constructed model can effectively predict the shear stress-strain relationship of the contact interface under high normal stresses and large shear displacements. The reasonable range for the perturbation threshold parameter γd was found to be(0.7 to 0.9) times γp(peak shear strain).更多还原