路基红黏土变形特征及E-B模型试验研究  

Experimental Research on Deformation Characteristics and E-B Model of Subgrade Laterite

作　　者：马吉倩[1] 

机构地区：[1]湖南省高速公路管理局,湖南长沙410022

出　　处：《公路工程》2016年第5期88-91,96,共5页Highway Engineering

基　　金：交通运输部建设科技项目(2014318785090);湖南省交通科技项目(200926)

摘　　要：针对湖南省某地区具有代表性的特殊公路路基填料—红黏土,设计并开展了不同压实度下的固结排水(CD)剪切试验,采集了压实红黏土在不同轴向应变、体积应变下所对应的偏应力数据,得出了不同状态下的压实红黏土的泊松比,并采用E-B非线弹性本构模型对该红黏土的应力-应变关系进行了描述。研究结果表明:随着红黏土压实度的降低,E-B模型参数c和φ的变化较小,而能够反映土体变形的K和K_b变化比较明显,因此对于变形控制要求较高的高等级红黏土公路路基,需要严格控制填料的压实度。For representative highway subgrade padding-laterite and carried out a number of consolidation drainage （CD） shear tests with Hunan,this paper designed different degree of compaction. The data of deviatoric stress corresponding to different axial and volumetric strains is acquired. Poisson＇ s ratio of laterite with different degree of compaction is obtained. E-B nonlinear elastic constitutive model is adopted to describe the stress-strain relationship of laterite. Research result shows that：with the decrease in degree of compaction,model parameters c and φ have no significant change, while K and Kb which reflect the deformation vary obviously. For high grade highway subgrade,which requires small deformation, the degree of compaction should be strictly controlled.

关 键 词：红黏土 固结排水剪切 轴向应变 体积应变 泊松比 E-B模型 

分 类 号：U416.03[交通运输工程—道路与铁道工程]