基于FWD三参数的路基模量预测方法  

A prediction method of subgrade modulus based on three parameters of FWD

作　　者：张磊[1,2] 张定一 肖倩 王龙[4] 姚鹏飞[1] ZHANG Lei;ZHANG Dingyi;XIAO Qian;WANG Long;YAO Pengfei(School of Transportation,Southeast University,Nanjing 211189,China;Nanjing Modern Multimodal Transportation Laboratory,Nanjing 211100,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]东南大学交通学院,南京211189 [2]南京现代综合交通实验室,南京211100 [3]交通运输部公路科学研究院,北京100088 [4]哈尔滨工业大学交通科学与工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2025年第3期25-33,共9页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51778142);中交公路院科研项目(H202008201);中国民航机场建设集团项目(JSRDKYN20220307)。

摘　　要：为了建立能够客观准确评价既有路基承载能力状况的测算方法,改善路面模量反算软件因初值选取不唯一而导致的误差问题,建立了路面弹性层状体系有限元动力模型,基于相关性分析筛选优化了弯沉盆参数,提出了基于BDI-F 2-d 9的三参数路基模量预测模型;在此基础上形成多层路面模量反算新方法,并利用北京RIOHTrack环道的4种不同典型路面结构的实测数据对该模型的有效性和准确性进行验证。结果表明:应用所提出的FWD三参数预测模型计算得到的路基模量较常规反算方法更为准确,且与承载板实测值之间存在较好的线性关系(R^(2)=0.9106),两者比值介于0.19~0.28之间,符合已有文献研究结论。以此路基模量预测值作为输入参数并利用沥青路面动力有限元模型能更加准确地模拟FWD测试动态过程,从而提高了路面各层模量的反算精度。研究成果为模量反算软件初值选取提供了参考,并为利用弯沉盆参数(DBP指标)构建适用于实际工程的路基、路面模量反算方法提供了理论依据。In order to objectively evaluate the bearing capacity condition of the existing subgrade and to eliminate the deviation by the popular back-calculation software due to the initial parameter values.A finite element dynamic model of asphalt pavement was established and optimized the bending basin parameters based on correlation analysis screening,so as to propose a three-parameter subgrade modulus prediction model based on BDI-F 2-d 9.On this basis,a new method was developed to conduct a multi-layer pavement modulus back-calculation,and the effectiveness and accuracy of the model were verified by using the measured data of four different typical pavement structures of the Beijing RIOHTrack.The results showed that there is a good linear relationship(R^(2)=0.9106)between the predicted subgrade modulus by proposed FWD three-parameter model and the measured value by the bearing plate.The ratio of them is between 0.19 and 0.28,which is consistent with the literature findings.Since this predicted subgrade modulus with more precision is utilized as an input parameter for the dynamic finite element model of asphalt pavement to simulate the real dynamic process of FWD testing,the more accurate results of the modulus of each layer of the pavement will produced by back-calculating.The research results provide the reference for the initial parameters value of modulus back-calculation software and provide the theoretical basis for back-calculation methods to calculate subgrade and each pavement modulus using DBP indexes as well.

关 键 词：道路工程 FWD模型 非线性特性 路基模量反算 

分 类 号：U416.217[交通运输工程—道路与铁道工程]