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论文首先进行了水泥石的三轴试验和静水试验,根据试验结果分析了宽围压范围下不同力学机理对水泥石宏观力学性能的影响.提出了基于热力学定律的剪切塑性、孔隙塑性与破坏准则相互作用的弹塑性损伤本构模型.该模型有效的考虑了围压对材料主要力学特征的影响,提出了与损伤准则相关联的塑性硬化函数.数值解答与试验结果比较表明,该本构模型可以很好地描述水泥石在低围压状态下的脆性、中围压下的脆-塑性转换以及高围压下的孔隙塑性为主的力学特征.
Based on the experimental results, the influence of different mechanics on the macroscopic mechanical properties of cement stone under wide confining pressure range is analyzed, and the shear plasticity, porosity plasticity and failure based on thermodynamic laws Plasticity constitutive model with interaction of the two criteria is proposed.The model effectively considers the influence of confining pressure on the main mechanical characteristics of the material and proposes a plastic hardening function which is related to the damage criterion.The comparison between the numerical solution and the experimental results shows that the constitutive model The model can well describe the mechanical properties of cement stone under low confining pressure, brittle-plastic transition at mid-confining pressure and pore plasticity under high confining pressure.