基于路面设计软件的新疆地区SMA橡胶沥青路面结构组合设计验证

高等级路面的早期病害一直都时有发生,如夏季高温车辙、冬季低温抗裂等。解决这些早期病害的的手段有很多,常用的是从路面原材料上控制,提高原材的性能指标。其次是提出适合的该地区的路面结构组合设计。本文的目的在于使用HPDS路面设计软件,从理论上验证实铺试验路段SMA橡胶沥青路面结构组合设计厚度是否合理,对路面结构组合设计进行验证,提出可以行建议。

公路水泥混凝土路面设计软件的应用方法

文章介绍了以《公路水泥混凝土路面设计规范》(JTGD40-2002)为设计依据的路面设计软件,着重于介绍该软件的主要功能、设计基本原理和流程设计、界面设计等要素。

温度膨胀系数对刚性路面设计的影响分析

为了研究热膨胀系数对水泥混凝土路面结构设计的影响,根据我国规范分析了热膨胀系数对面层板温度应力的影响,同时采用美国力学经验设计法分析了热膨胀系数对水泥混凝土路面横缝错台量的影响.结果表明:热膨胀系数对接缝传荷能力以及板角翘曲变形的影响会直接改变水泥混凝土路面设计厚度.因此,在水泥混凝土路面设计中引入热膨胀系数参数意义重大.

全厚式沥青路面疲劳性能研究

通过四点弯曲疲劳试验测试了沥青混合料的疲劳寿命,对疲劳性能进行分析;基于测试结果,通过Alize路面设计软件探讨了全厚式沥青路面的疲劳寿命受层间连接状态、温度和结构层厚度的影响情况。结果表明:某区间范围内,提高沥青含量能增强沥青混合料抗疲劳性能且其受沥青类型的影响;连续连接的路面层间结构能使路面疲劳寿命增加;沥青路面疲劳寿命因温度升高会随之减小;对于沥青层层底拉应变和疲劳寿命而言,基层厚度和路基模量有最大的影响。

A Comparison of Different Approaches in Numerical Modeling of Pavement Granular Material

Modeling pavement granular materials have played through an experimental or numerical approach to predict the a significant role in pavement design procedure. Modeling can be granular behavior during cyclic loading. Current design process in western Australia is based on linear elastic analysis of layers. The analysis is largely performed through a well-known program CIRCLY which is applied to model bound pavement material behavior. The KENLAYER is one of the common pavement software models used for pavement design in the United State which performs non-linear analysis for granular materials. Alternatively, a general finite element program such as ABAQUS can be used to model the complicated behavior ofmultilayer granular materials. This study is to compare results of numerical modeling with these three programs on a sample constructed pavement model. Moreover, a parametric study on the effects of Poisson ratio over the surface deflection of the flexible pavement has been conducted. It is found that increase in Poisson ratio of asphalt layer will increase the surface deflection while the increase in Poisson ratio of granular layers decreases the surface deflection.