摘要
【目标】针对多次加铺后机场道面因其层间接触复杂而易出现轮辙病害与层间剪切破坏的问题,研究道面转弯区在飞机荷载作用下的轮辙变形规律与层间应力分布特性。【方法】基于上海虹桥机场跑道结构,建立多次加铺的道面转弯区三维有限元模型,并设计室内轮辙试验进行模型层间接触比选和验证。利用验证后的有限元模型分析层间接触、旧道面状态和加铺次数对道面轮辙发展和层间应力的影响规律。【结果】随着层间摩擦系数由0.7增至0.9,轮辙变形量减小,最大轮辙变形量由1.53 mm减小至0.99 mm,综合轮辙深度值逐渐降低,层间最大剪切应力减小了33.34%;旧道面老化程度由0发展至180%,虽然对轮辙发展抑制有利,但是综合轮辙深度值略有提升,而且层间水平剪切应力消散变慢,层间力学性能降低;随着加铺次数由1次增至4次,右侧轮辙变形量明显增大,综合轮辙深度值大幅度增加,但层间水平剪切应力降低了22.32%。进一步根据道面轮辙变形和层间应力发展情况,提出基于综合轮辙深度值的道面转弯区轮辙变形评价指标和层间应力评价指标,得出设计容许剪切应力值为1.9 MPa。【结论】库伦摩擦模型可有效模拟层间接触状态;加强层间接触、旧道面适度老化及合理控制加铺次数有助于抑制轮辙发展并降低层间剪切应力。所提出的评价指标为多次加铺道面的设计与维护提供了理论依据。
[Objective]This study aims to address the rutting and interlaminar shear damage of airport multi-layered pavement,as well as investigate the rut deformation and interlaminar stress distribution in turning area under aircraft loading.[Method]Based on the runway structure of Shanghai Hongqiao Airport,a three-dimensional finite element model of multi-layered pavement in turning area was established.The laboratory rutting test was designed to compare and validate the model interlaminar contact.The influences of interlaminar contact,aged pavement condition and overlaying numbers on pavement rutting development and interlaminar stress were analyzed by using the verified finite element model.[Result]When the interlaminar friction coefficient increases from 0.7 to 0.9,the rut deformation decreases.With the maximum rut deformation decreasing from 1.53 mm to 0.99 mm,the composite rut depth gradually decreases,and the maximum interlaminar shear stress decreases by 33.34%.The aging degree of aged pavement increases from 0 to 180%,which is beneficial for inhibiting the rutting development;however,the composite rut depth slightly increases,and the dissipation rate of interlaminar horizontal shear stress slows down,resulting in a decrease in interlaminar mechanical properties.When the overlaying increases from one time to four times,the right side rut deformation significantly increases,and the composite rut depth greatly increases;however,the interlaminar horizontal shear stress decreases by 22.32%.The composite rut depth based evaluation index for rut deformation and the interlaminar stress evaluation index were proposed based on developments of pavement rutting and interlaminar stress.The design allowable shear stress value is calculated to be 1.9 MPa.[Conclusion]Coulomb friction model can simulate the interlaminar contact effectively.The enhanced interlaminar contact,appropriate aging for aged pavement,and reasonable controlled overlays contribute to inhibit rutting development and reduce interlaminar shear stress.The proposed evaluation indexes provide a theoretical basis for the design and maintenance of multi-layered pavements.
作者
蔡靖
杜妮治
孙盼峰
李岳
陈红燕
CAI Jing;DU Nizhi;SUN Panfeng;LI Yue;CHEN Hongyan(School of Traffic Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Nanjing Branch,China Postal Airlines Co.,Ltd.,Nanjing,Jiangsu 211113,China;Xi’an Aeronautical Polytechnic Institute,Xi’an,Shaanxi 710089,China)
出处
《公路交通科技》
北大核心
2025年第10期182-193,共12页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(52472369)
天津科技创新引导专项(25YDTPJC00370)
天津市交通运输科技项目(2025-70)。
关键词
道路工程
层间应力
有限元模拟
多次加铺道面
轮辙试验
road engineering
interlaminar stress
finite element simulation
multi-layered pavement
rutting test
