Abstract

Cemented sand and gravel (CSG) material is a typical elastic-plastic material, the failure mechanisms and the mechanical properties were greatly related to the loads and the mixing proportions. The stress-strain curves showed obvious nonlinear hysteresis loops under cyclic loadings, and the cumulative damage size affects the fatigue life of materials. Based on the test results, the non-linear damage evolution law of CSG materials under the cyclic loading was further studied. The results showed that the relationship curves between the damage variables and the cumulative strain were index under different loadings. A dynamic damage constitutive model was founded according to the test results which can reveal the damage process of CSG materials under different loading types and the upper limit stress ratios.

摘要

水泥砂石（CSG）材料是一种典型的弹塑性材料，其失效机理和力学性能与载荷和混合比例有很大关系。应力-应变曲线在循环载荷作用下呈现明显的非线性磁滞回线，累积损伤尺寸影响材料的疲劳寿命。根据试验结果，进一步研究了循环载荷作用下CSG材料的非线性损伤演化规律。结果表明，损伤变量与累积应变的关系曲线是不同载荷下的指标。根据试验结果建立了动态​​损伤本构模型，可以揭示CSG材料在不同载荷类型和上限应力比下的损伤过程。