不同路面结构对软基不均匀沉降的适应性研究

针对软土地基的特点，基于弹性层状多层体系理论和国外容许应变设计方法，设计了两种具有级配碎石和较厚沥青层的沥青路面结构、一种常规的半刚性基层沥青路面结构；运用ABAQUS有限元程序分析了3种路面结构中路堤的沉降、结构层底面的附加应力等力学响应；采用灰色关联决策理论，确定了3种路面结构的软土地基适应性以及底基层合理的弹性模量。分析表明，级配碎石夹层沥青路面结构具有较好的软土地基适应性，其底基层材料宜采用较高的模量；而常规的半刚性基层沥青路面结构对软基的适应性较差。分析结果可为软土地区新建沥青路面结构设计提供参考。

Adaptability of Different Asphalt Pavement Structures on Soft Ground with Differential Settlements

Because semi-rigid base asphalt structures on soft grounds usually encounter severe premature distress induced by differential settlements of embankment,it's urgently necessary to find out new pavement structures to adapt soft grounds.On the basis of soft ground's properties,using multi-layered elastic theory and tolerant strain design methods,two pavement structures with crush rock and thick asphalt mixtures are presented,including a common semi-rigid base asphalt structure.With the help of ABAQUS FEA software,mechanical responses,which include embankment settlement,additional stress,of three pavement structures are calculated.With grey incidence decision theory,adaptability of three pavement structures on soft grounds and optimal elastic moduli of subbase are analyzed.The results show that,sandwich asphalt pavement structures have good adaptability on soft grounds higher moduli of subbase should be selected,and that conventional semi-rigid base asphalt structure has poor adaptability.It can offer some valuable data for new pavement design on soft ground.