不连续变形分析与土的应力应变关系

Stress strain relationship for soil using discontinuous deformation analysis

为研究土的复杂的变形机理 ,采用适用于不连续体问题的数值分析方法—— DDA (discontinuous deform ationanalysis)对土的平面应变试验进行了模拟。结合对颗粒间相互作用的理论分析揭示了土的弹塑性、剪胀性、应变软化、卸载 -再加载时的滞回圈、卸载体缩以及剪切带的形成等独特的应力变形现象和特性的微观机理。试验结果与数值模拟的对比表明 。

Soil deformation was studied using discontinuous deformation analysis for discontinuous bodies to simulate the plane strain. The micro mechanisms of the stress strain relation for soil, such as elasto plastisity, dilatancy, strain softening, hysteresis loop in unloading reloading, anisotropy, and volume contraction due to axial unloading were predicted by the simulation using DDA combined with theoretical analysis of the interaction between soil particles. Comparison of simulating results with test ones shows that DDA is a powerful tool for analyzing the constitutive relationship for soil.