基于有限元遗址土应力-应变关系的方法研究1)

遗址土作为一种物质成分和内部结构特征复杂的多组分材料,其劣化机理和力学性能备受关注。本文基于材料类比思想和广义相似理论,探索了细观尺度下 遗址土颗粒间胶结物的力学性能的确定方法;依据 遗址土电镜图及少量的力学测试结果,构建了颗粒、胶结物和孔隙三部分组成的细观模型并推导得出不同含水率 遗址土的应力-应变关系公式,数值分析结果与宏观试验结果具有很好的一致性,表明本文关于 遗址土的研究思路和研究方法是可行的。

FINITE ELEMENT METHOD STUDY ON STRESS-STRAIN RELATIONSHIP OF SITE SOIL$^{1)}$

The deterioration mechanism and mechanical properties of site soil, a multi-component material with complex material composition and internal structural characteristics, have attracted much attention. Based on the idea of material analogy and generalized similarity theory, this paper explores the determination method of mechanical properties of inter granular cement in site soil at meso scale. According to the electron microscope and a small amount of mechanical test results of site soil, a meso model composed of particles, cement and pores is developed, and the stress-strain relationship formula of site soil with different water content is deduced. The numerical results are in good agreement with the macro test results, which shows that the present concepts and methods on site soil in this paper are feasible.