耐久性沥青路面混凝土基层荷载应力三维有限元分析

为了分析各因素对耐久性沥青路面混凝土基层荷载应力的影响,建立了三维有限元模型,确定了计算参数,通过正交设计法安排参数组合,计算混凝土基层底面的荷载应力,并对计算结果进行极差与方差分析。分析结果表明:混凝土基层底面荷载应力随沥青面层厚度增大总体呈减小趋势,但减小幅度不大,随基层厚度增大而减小,随基层模量增大而增大,随地基模量增大显著减小,面层模量变化对基层荷载应力几乎无影响;置信概率为95%时,对基层荷载应力有显著影响的因素是地基模量、基层模量和基层厚度,当置信概率为90%时,地基模量、基层模量、基层厚度和面层厚度影响的显著性依次减小。

Load stress analysis of concrete base for durable asphalt pavement with 3D finite element model

In order to analyze the influence of some factors on the load stress of concrete base for durable asphalt pavement,a 3D finite element model was built,the calculation parameters of the model were determined,they were arranged by using orthogonality design method,the load stress at the bottom of concrete base was calculated,and the maximum difference and variance of the calculation results were analyzed.Analysis result shows that the load stress of concrete base decreases slightly with the thickness increase of asphalt surface,decreases with the thickness increase of concrete base,increases with the modulus increase of concrete base,and decreases notably with the modulus increase of subground,while there is little influence of surface course modulus on the load stress;the prominent influence factors of the load stress are subground modulus,concrete base modulus and thickness when the confidence probability is 95%,while the prominent factors are subground modulus,concrete base modulus and thickness,surface course thickness when the confidence probability is 90%,and the prominence of each factor decreases in turn.