重载作用下路用材料特性及设计参数研究

【作者】 张海斌；

【导师】 王选仓；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2001， 硕士

【摘要】 车辆超载现象在我国非常普遍，直接结果就是导致路面早期破坏，影响道路的正常使用。为了能够进一步了解重载作用下路面结构的力学特性，为重载道路设计提供可靠的依据，本文对路面半刚性材料的应力工作范围进行了系统分析，给出了半刚性材料在荷载作用下的应力工作区间；对路用材料的非线性性质进行了较深入的分析，给出了模量的应力依赖模型；进行了半刚性材料应力应变试验，分析了半刚性材料的应力应变曲线，并根据重载下材料的工作区间，建议对材料的模量确定采用曲线的后半段；对土基承载板试验确定模量的方法，建议控制回弹变形在0.6mm的范围内进行反复加载试验，根据数据回归确定模量值；根据面层底面的应力变化情况，建议重载下沥青路面仍然按现行规范推荐值选取；对重载刚性路面，主要研究分析了地基模量增大系数，对比分析了原有计算公式，并在考虑地基的非线性因素的情况下，对原公式进行了修正。更多还原

【Abstract】 The penomenon of vehicle being over-load is commonplace in China, which is the main reason of initial damage of pavement and affects the normal usage of pavement. In order to comprehend the mechanical behavior under heavy load further and build reliable design base of heavy-load pavement, the stresss working range of semi-rigid material is analyzed systematically and the working area of stress is suggested. The paper also analyzes non-liner behavior of pavement material deeply, and suggests the stress-dependency model of module. Stress-strain curve is analyzed by the stress-strain experiments of semi-rigid material. According to the working area of streaa-strain under heavy load, the choice of back part of the curve is proposed to calculate the module value of material. With loading plate experiments, the rebound deformation of subgrade is suggested controlling under 0.6mm under heavy load and the module value is advised caculating by regression analysis. Based on the stress- strain analysis of surface, the recommendatory model value of Spec qication for design of highway asphalt pavement is advised keeping. To heavy-load rigid pavement, it mainly researched the module augment coefficient. Original formulae are analyzed and corrected.更多还原