路基土回弹模量应力依赖性分析及预估模型  

Stress-dependent characteristics and prediction model of the resilient modulus of subgrade soils

作　　者：陈声凯[1] 凌建明[1] 罗志刚[1] 

机构地区：[1]同济大学

出　　处：《土木工程学报》2007年第6期95-99,104,共6页China Civil Engineering Journal

基　　金：交通部西部交通建设科技项目(2004 318 000 04)

摘　　要：通过室内重复加载三轴试验研究4种常用路基土的回弹特性,分析回弹模量对体应力、侧向应力、偏应力的依赖关系。试验结果表明,回弹模量值是两个应力变量的函数,且当其中一个变量保持不变时,回弹模量值随另一变量呈非线性变化,函数关系应为幂函数形式。在此分析基础上,参考Uzan模型表达式,以偏应力和体应力为变量回归得出相应的路基土回弹模量预估模型,拟合结果良好。模型的建立,有利于更好地理解路基土的回弹特性,并为路基模量设计值的取用与路面结构力学响应计算提供可靠的技术依据。The dynamic resilient modulus of 4 subgrade soils were studied by using repeated loading triaxial test. The relationships between the resilient modulus, bulk stress, confining stress and deviation stress were analyzed. The result demonstrated that the resilient modulus is a function of two stress variables, and that when one stress variable is fixed, the relationship between the resilient modulus and the other stress variable is a power function. A prediction model which involves bulk stress and deviation stress was obtained from a stress-dependent analysis and the Uzan model.

关 键 词：路基土 回弹模量 重复加载三轴试验 应力依赖性 预估模型 

分 类 号：U416.03[交通运输工程—道路与铁道工程]