土石混合料结构强度的微观分析  

Micro-analysis of Structural Strength of Earth-rock Mixture

作　　者：周志军[1] 朱宏祥 张熠[3] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]陕西省交通建设集团公司,陕西西安710075 [3]陕西省公路局,陕西西安710068

出　　处：《中国公路学报》2008年第3期30-34,共5页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200131881207)

摘　　要：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.

关 键 词：道路工程 土石混合料 微观分析 应力一应变关系 等效半径 颗粒形状修正系数 孔隙比 

分 类 号：U414.1[交通运输工程—道路与铁道工程]