级配土的力学性能试验  

Test on mechanic properties of graded soil

作　　者：张志峰[1] 郝飞[2] 沈建军[1] 冯忠绪[1] 

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064 [2]南京工程学院机械工程学院,江苏南京211167

出　　处：《长安大学学报（自然科学版）》2009年第4期16-19,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家"863"计划重大项目(2001AA422012)

摘　　要：为了确定振动压实仿真分析时土壤的本构关系(应力-应变关系)及性能参数,对级配土的动三轴试验数据和直剪试验数据进行回归分析,研究了级配土的强度参数和应力-应变关系。试验结果表明:级配土的粘聚力c和内摩擦角φ均随干密度的增加而增加,随含水量的增加而减小;取对数后,lg(c)、lg(φ)与级配土干密度、含水量具有较好的线性关系;振动荷载下,级配土的动应力-动应变关系受固结应力、干密度和含水量的影响较大,在低固结应力时,级配土的动应力-动应变近似呈线性关系。In order to determine the stress-strain relations and performance parameters of graded soil during the simulation analysis of vibration drum and soil model, the dynamic triaxial and direct-shear tests are performed on graded soil to analyze its strength parameters and the stress-strain relationship. The results indicate that the cohesive strength c and the internal frictional angle φ will increase with the increasing of dry density when the moisture content keeps constant, and the two strength parameters will decrease with the increasing of moisture content. The lg（c） and lg（φ） have a linear relation with dry density and water content of graded soil by regression analysis. The consolidation stress, dry density and water content have a great effect on the relationship with dynamic stress and dynamic strain of graded soil when the graded soil is applied to vibrating load. Especially, the dynamic stress has a linear relation with dynamic strain when the consolidation stress is low. 1 tab, 9 figs, 10 refs.

关 键 词：道路工程 级配土 应力-应变关系 动三轴 直剪试验 动应力 

分 类 号：U412.22[交通运输工程—道路与铁道工程]