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抗剪强度和压缩体应变是冻土与结构接触面的力学特性指标中最重要的两个参数,对冻土与结构接触面的力学分析至关重要。采用自行研制的大型多功能冻土-结构接触面循环直剪系统,开展了冻土与结构接触面力学性能及变形规律的试验研究,采用损伤力学理论,基于等应变分布假设、零弹性域假设、弹性应变无耦合假设,选择不可逆性体应变与最大不可逆性体应变的比值作为损伤因子,建立了用于描述冻土与结构接触面剪切行为的抗剪强度与压缩体应变损伤模型。通过相关试验对建立的损伤模型进行验证,结果表明,所建模型是准确、合理的。
Shear strength and compressive body strain are the two most important parameters in the mechanical properties of the interface between frozen soil and structure, which is of vital importance to the mechanical analysis of the contact surface between frozen soil and structure. The experimental study on the mechanical properties and deformation of the interface between frozen soil and structure was carried out by using self-developed large-scale multi-function frozen soil-structure contact cycle direct shear system. Based on the damage mechanics theory, based on the assumption of equal strain distribution, , The assumption of no coupling of elastic strain and the ratio of irreversible body strain to the maximum irreversible body strain as the damage factor, the shear strength and compression body strain damage model for describing the shear behavior of the contact surface between frozen soil and structure are established. The established damage model is validated through related experiments. The results show that the model is accurate and reasonable.