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针对土-结构接触面剪切特性,基于现有统计损伤理论提出了土-结构接触面剪切损伤模型及模型参数的确定方法。利用大型直剪仪对红黏土-混凝土结构接触面进行直剪试验,分析了红黏土-结构接触面上剪应力-应变特性。根据试验结果得到红黏土-结构接触面剪切损伤模型的相关参数,建立了基于Weibull分布的损伤模型参数与法向应力的关系,并对模型进行了修正。最后将理论计算结果与试验结果进行了对比分析,验证了该模型的合理性。研究成果表明:法向应力水平越大,黏性土-结构接触面剪切软化现象越不显著,应力应变关系由软化型转变为弱软化型。通过对接触面直剪试验的成果进行验证,模型计算与试验结果吻合较好,证明了文中提出的剪切损伤模型具有能够充分反映土-结构接触面软化特性和应力状态的特点,模型参数较少。
Aiming at the shear characteristics of soil-structure contact surface, a shear damage model of soil-structure contact surface and a method of determining model parameters are proposed based on the existing statistical damage theory. The direct shear test was conducted on the contact surface of red clay-concrete structure with large direct shear instrument, and the shear stress-strain characteristics of the red clay-structure interface were analyzed. Based on the experimental results, the relevant parameters of the shear damage model of the red clay-structure contact surface are obtained. The relationship between the damage model parameters and the normal stress based on the Weibull distribution is established and the model is modified. Finally, the theoretical calculation and test results were compared and analyzed to verify the rationality of the model. The research results show that the larger the normal stress level is, the less obvious the shear softening phenomenon of the cohesive soil-structure contact surface is, and the stress-strain relationship changes from softened to softened. Through the verification of the results of the direct shear test of the contact surface, the model calculation is in good agreement with the experimental results. It is proved that the shear damage model proposed in this paper has the characteristics of fully reflecting the softening and stress states of the soil-structure interface, less.