基于高温条件的级配碎石柔性基层结构响应三维有限元数值分析

Three-dimensional Finite Element Numerical Analysis for Response of Flexible Base Structures of Graded Gravels at High Temperature

采用三维有限元对高温条件下的几种以级配碎石为基层的柔性和半柔性基层沥青路面结构进行数值模拟分析,分析表明:级配碎石基层顶面的最大压应力与底基层模量之间呈幂函数关系,级配碎石基层顶面的最大压应力随底基层模量的增加而单调增加;当沥青面层较薄时,级配碎石基层顶面最大压应变与底基层模量之间呈正相关性;当沥青面层较厚时,级配碎石基层顶面最大压应变随底基层模量的增加先减小后增加,存在一个压应变极小值;与底基层模量相比,沥青面层的厚度变化对级配碎石基层顶面最大压应力和压应变的影响大得多。

A numerical simulation analysis for flexible and semi-flexible base asphalt pavement structures of a few graded gravels at high temperature is carried out by means of three-dimensional finite element.The analysis shows that the maximal compressive stress on top of the graded gravel base is a power function of the bottom modulus of base,and monotonically increases with increase of the bottom modulus of base;when the asphalt surface course is thin,the maximal compressive strain on top of the graded gravel base is in positive correlation with the bottom modulus of base;while the asphalt surface course is thick,the maximal compressive strain on top of the graded gravel base decrease and then increases with increase of the bottom modulus of base,and a minimum value of compressive strain exists.Compared with the bottom modulus of base,the changes in thickness of asphalt surface course exhibit much more significant influences on the maximal compressive stress and strain on top of the graded gravel base.