绿洲-荒漠区路基工作区深度计算及影响因素分析

Calculation of subgrade workspace depth in oasis-desert region and its influencing factors

考虑车辆荷载为半正弦移动荷载,文章基于ADINA有限元软件,建立了三维有限元分析模型。计算路基不同深度处动应力的大小,并与实测数据对比,验证了模型的正确性,通过分析新疆绿洲-荒漠区的典型公路结构层形式,计算得出了该公路结构层的路基工作区深度为1.44m左右。同时分析不同移动速度、超载量、路基模量、基层模量和基层厚度对路基工作区深度的影响,得出路基工作区深度随着荷载移动速度、基层模量和基层厚度的增大而减小,随着路基模量和超载量的增大而增大。研究结果可为绿洲-荒漠区公路设计及施工提供有益的参考。

Considering vehicle load as half-sinusoidal moving load ,and based on the finite element soft-ware ADINA ,three-dimensional finite element analysis model is established .The dynamic stress of the subgrade at different depths is calculated and the results are compared with the measured data , thus verifying the correctness of the model .The typical road structure layer mode in Xinjiang oasis-desert region is analyzed and the depth of subgrade workspace of this typical road structure layer is calculated as about 1.44 m .The effect of factors such as overload volume ,driving speed ,base course modulus and thickness and subgrade modulus ,on the depth of subgrade workspace is studied .It is concluded that the depth of subgrade workspace decreases with the increase of driving speed ,base course modulus and base thickness ,and increases with the increase of subgrade modulus and overload volume .The research conclusions can provide reference for highway design and construction in oasis-desert region .