摘要
半柔性路面材料具有显著的拉压差异性,若采用传统单一模量的线弹性理论进行路面结构力学响应分析,与实际情况有较大偏差。针对半柔性路面结构的分析与优化,该文基于双模量理论,对比分析了6种不同半柔性层位及厚度组合下路面结构关键力学响应的变化规律。结果表明:基于双模量理论的路面关键力学响应计算结果与单模量线弹性理论差距较大,其中路面纵向最大拉应变差距最为明显(超60%);相对于其他层位组合,上或中面层为半柔性路面材料时路表弯沉偏大,路面结构整体刚度较小;中下、下或上中下面层为半柔性路面材料时,下面层层底拉应力偏大,导致其易开裂;而中上面层为半柔性路面材料时,其关键力学响应综合较小,据此推荐中上面层为最佳应用层位。并建立了各关键力学响应随半柔性层厚度变化的关系模型,其中路表最大拉应力受到半柔性层厚度的影响最大(可达64%),半柔性材料应用于中上面层时,其最佳厚度范围为10~12 cm。该研究成果可为考虑拉压差异的半柔性路面结构设计提供参考。
Semi-flexible pavement materials have significant differences in tension and compression.If the mechanical response analysis of pavement structures is conducted by using the traditional linear elastic theory with a single modulus,there will be a considerable deviation from actual situations.To analyze and optimize semi-flexible pavement structures,this paper compared the changes in key mechanical responses of pavement structures under six different semi-flexible layer positions and thickness combinations based on the double modulus theory.The results show that there is a significant difference in the calculation results of key mechanical responses of the pavement based on the double modulus theory and the single modulus theory,with the difference in the maximum longitudinal tensile strain of the pavement being the most significant(over 60%).Compared to other layer combinations,when the upper or middle layer is composed of a semi-flexible pavement material,the surface deflection is larger,and the overall stiffness of the pavement structure is smaller.When the middle-lower,lower,or upper-middle-lower layers contain semi-flexible pavement materials,the tensile stress at the bottom of the lower layer is high,which makes it prone to cracking.When the middle-upper layers contain semi-flexible pavement materials,the critical mechanical response is relatively small,and it is recommended that the upper-middle layer be the optimal application layer.A model for the relationship between the key mechanical responses and the thickness of the semi-flexible layer was established.The maximum tensile stress on the road surface is most significantly affected by the thickness of the semi-flexible layer(up to 64%).When the semi-flexible material is applied to the upper-middle layers,the optimal thickness range is 10-12 cm.The research results can provide reference for the design of semi-flexible pavement structures considering the differences in tension and compression.
作者
潘勤学
周殊睿
胡嘉
张龙
宋小金
刘宏富
PAN Qinxue;ZHOU Shurui;HU Jia;ZHANG Long;SONG Xiaojin;LIU Hongfu(School of Transportation,Changsha University of Science&Technology,Changsha,Hunan 410114,China;National Engineering Research Center of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Zhongteng Zhixin Technology(Hunan)Co.,Ltd.,Changsha,Hunan 410036,China)
出处
《中外公路》
2025年第3期74-82,共9页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:52378441,51908071,52078064)
湖南省自然科学基金资助项目(编号:2024JJ5037)
湖南省交通运输厅科技进步与创新计划项目(编号:202107)
湖南省教育厅科学研究项目(编号:24B0322)。
关键词
半柔性路面
双模量
力学分析
层位优化
厚度控制
数值计算
semi-flexible pavement
double modulus
mechanical analysis
layer optimization
thickness control
numerical calculation
