路基工作区的确定方法研究

Methodology Study on Defining Subgrade’s Working Area

摘要:

通过应用BISAR软件,详细比较路基工作区深度的确定结果与原路基教材上的方法,全面分析了道路铺面结构的刚度效应、道路路基的刚度效应、车辆荷载的效应对路基工作区深度的影响.通过分析,发现原工作区深度确定方法中关于铺面结构层厚度当量换算方法存在不当之处,以及按车辆荷载附加应力与道路自重应力之比的应力比来确定路基工作区深度将带来的某些不合理之处,提出以车辆荷载附加应力与路基土单轴压缩强度之比的应力比作为衡量路基工作区深度的改进建议.

Abstract:

Based on BISAR software,a comparative study was made of the subgrade working area depth.A full analysis was made of the effects of pavement structure rigidity,subgrade rigidity and vehicle load on the subgrade working area depth.A mistake in converting the pavement structure layers’ thickness into equivalent subgrade thickness in original subgrade textbook was disclosed,which may lead to some illogical results by using the ratio of vehicle load adding stress to road deadweight stress to define the subgrade working area.Finally,this paper presents a proposal to replace the road deadweight stress with soil terminal strength in defining subgrade working area.