土石混合料结构强度的微观分析

Micro-analysis of Structural Strength of Earth-rock Mixture

根据颗粒随筛孔直径的质量分布函数,求出土石混合料粗颗粒部分颗粒总数,进而确定出土石混合料粗颗粒部分等效半径。基于散粒体平均应力与颗粒微观接触力之间的关系,引入颗粒形状修正系数,得到土石混合料的三维应力-应变关系。结果表明:影响土石混合料结构强度的主要因素有孔隙比、等效粒径、形状修正系数及刚度比例系数等参数,其中形状修正系数越大,等效半径及孔隙比越小,土石混合料的力学性能越好,反之越差。

According to the quality distribution function of the granule with the change of the mesh diameter, the total amount of the coarse granule of earth-rock mixture was obtained, and the equivalent radius of the coarse granule of earth-rock mixture was determined. Based on the relation between the average stress of particulates and microscopic contact force of granule, the relation between stress and strain of the earth-rock mixture was put forward by introducing the correcting coefficient of the granule shape. Results show that the influencing factors of the structural strength of the earth-rock mixture include pore-solid ratio, equivalent radius, correcting coefficient of the shape and proportion coefficient of rigidity. The correcting coefficient of shape increases; equivalent radius and pore-solid ratio decrease and the mechanics property of the earth-rock mixture increases.