级配碎石基层沥青路面FWD反算模量换算系数
发布时间：2018-09-06 06:46
【摘要】：为了获取真实反映沥青路面结构力学特性和材料性状的结构模量参数,铺筑了4种结构级配碎石基层沥青路面足尺试验路,对其进行加速加载疲劳破坏试验和路面弯沉检测。基于FWD弯沉测试方案,应用分层检测分析方法逐层检测了路面结构层的弯沉,并根据足尺路面加载破坏的损坏程度,进行了路表FWD弯沉测试和弯沉迭代反演,分析了FWD反算模量受荷载水平、位置和路面温度的影响规律,建立了FWD反算模量与实验室动态模量的关系,提出了沥青混凝土、级配碎石和路基土实验室动态模量与FWD反算模量的换算系数K。研究结果表明:沥青混凝土模量受温度和轮载作用的影响最大,路面结构完好的沥青层反算模量换算系数K=0.7~1.0;路面出现Top-down开裂后,K=1.3~1.5;沥青层层底出现疲劳破坏时,K1.5;级配碎石层反算模量换算系数为1.32~1.49;土基反算模量换算系数与其所受的应力水平及土质类型相关,随应力水平的降低,土基反算模量换算系数减小。
[Abstract]:In order to obtain the structural modulus parameters which truly reflect the structural mechanical properties and material properties of asphalt pavement, four kinds of full-scale test roads of asphalt pavement with graded macadam base were constructed, and the accelerated loading fatigue failure test and pavement deflection test were carried out. Based on the FWD deflection test scheme, the pavement structural layer deflection is detected layer by using the method of stratified detection and analysis. According to the damage degree of full-scale pavement loading damage, the FWD deflection test and iterative deflection inversion are carried out on the pavement surface. The influence of load level, location and pavement temperature on FWD's backcalculation modulus is analyzed. The relationship between FWD's backcalculation modulus and laboratory dynamic modulus is established, and the asphalt concrete is put forward. The conversion coefficient between laboratory dynamic modulus of graded crushed stone and subgrade soil and FWD inverse modulus. The results show that the modulus of asphalt concrete is most affected by temperature and wheel load. Conversion coefficient of reverse calculation modulus of asphalt layer with intact pavement structure K0. 7 ~ 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 1. 0. 0. 1. 0. 0. 1. 0. 0. 1. 0. 0. 1. 0. The stress level is related to the type of soil, With the decrease of stress level, the conversion coefficient of the back-calculated modulus of soil foundation decreases.
【作者单位】： 山东交通学院土木工程学院;高速公路养护技术交通行业重点实验室;
【基金】：交通运输部应用基础研究项目(2011 319 817 480) 山东省交通科技创新计划项目(2011-10) 山东交通学院科研基金项目(Z201244)
【分类号】：U416.217
[Abstract]:In order to obtain the structural modulus parameters which truly reflect the structural mechanical properties and material properties of asphalt pavement, four kinds of full-scale test roads of asphalt pavement with graded macadam base were constructed, and the accelerated loading fatigue failure test and pavement deflection test were carried out. Based on the FWD deflection test scheme, the pavement structural layer deflection is detected layer by using the method of stratified detection and analysis. According to the damage degree of full-scale pavement loading damage, the FWD deflection test and iterative deflection inversion are carried out on the pavement surface. The influence of load level, location and pavement temperature on FWD's backcalculation modulus is analyzed. The relationship between FWD's backcalculation modulus and laboratory dynamic modulus is established, and the asphalt concrete is put forward. The conversion coefficient between laboratory dynamic modulus of graded crushed stone and subgrade soil and FWD inverse modulus. The results show that the modulus of asphalt concrete is most affected by temperature and wheel load. Conversion coefficient of reverse calculation modulus of asphalt layer with intact pavement structure K0. 7 ~ 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 1. 0. 0. 1. 0. 0. 1. 0. 0. 1. 0. 0. 1. 0. The stress level is related to the type of soil, With the decrease of stress level, the conversion coefficient of the back-calculated modulus of soil foundation decreases.
【作者单位】： 山东交通学院土木工程学院;高速公路养护技术交通行业重点实验室;
【基金】：交通运输部应用基础研究项目(2011 319 817 480) 山东省交通科技创新计划项目(2011-10) 山东交通学院科研基金项目(Z201244)
【分类号】：U416.217
【参考文献】
相关博士学位论文 前1条
1 庄传仪;基于加速加载响应的柔性基层沥青路面设计指标与参数研究[D];长安大学;2012年
【共引文献】
相关博士学位论文 前2条
1 管志光;足尺路面加速加载试验系统的研究[D];山东大学;2012年
2 李，
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