半刚性基层沥青路面高速弯沉仪弯沉检测影响因素分析  

Influence Factors Analysis for Deflection Measurement Under Traffic Speed Deflectometer on Semi-rigid Asphalt Pavement

作　　者：黎琴 贺隽 何佼莲 董侨[2,3] 李亘宇 LI Qin;HE Jun;HE Jiaolian;DONG Qiao;LI Hengyu(Guizhou Provincial Highway Construction and Maintenance Group Co.Ltd.,Guiyang 550000,China;School of Transportation,Southeast University,Nanjing 211189,China;Southeast University Road Traffic Engineering National Experimental Teaching Demonstration Center,Nanjing 211189,China)

机构地区：[1]贵州省公路建设养护集团有限公司,贵阳550000 [2]东南大学交通学院,南京211189 [3]东南大学道路交通工程国家级实验教学示范中心,南京211189

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第6期1192-1198,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：贵州省交通运输厅科技项目(2021-122-006)。

摘　　要：本文研究了温度、速度和厚度等环境因素对交通速度弯沉仪(TSD)弯沉测量结果的影响,采用COMSOL建立了道路动态弯沉分析模型,以广义Maxwell模型表征面层沥青混合料的黏弹性力学性质,并基于非均布轮迹和简谐波运动模型模拟TSD的动态荷载.有限元结果显示弯沉最大值位置和加载中心并不重合,温度、速度越高迟滞效果越明显.D_(0)和D_(0)-D_(20)等弯沉盆参数均随温度升高而增加,随移动速度的增加而减少.面层厚度和基层厚度的增加均会减少路表弯沉,基层厚度变化对路表弯沉的影响更小,面层、基层和地基模量与对应的弯沉盆参数之间存在类似幂函数的关系,弯沉指标对基层模量的敏感性相对较低.基于COMSOL参数化扫描得到的2401组数据,应用决策树算法进行数据挖掘,发现面层厚度、温度和速度对TSD测量结果的影响依次减小.以落锤式弯沉仪(FWD)的模拟结果作为弯沉检测的标准值,使用多元回归的方法建立了TSD弯沉测量结果修正模型,能够较好地修正面层厚度、温度和车速带来的影响.The influence of environmental factors,such as temperature,speed and thickness,on the deflection measurement results of traffic speed deflectometer(TSD)was studied.The dynamic deflection analysis model of road was established by COMSOL,and the viscoelastic mechanical properties of asphalt mixture on pavement were characterized by generalized Maxwell model,and the dynamic load of TSD was simulated based on uneven wheel tracks and simple harmonic motion model.The finite element results show that the position of the maximum deflection does not coincide with the loading center,and the higher the temperature and speed,the more obvious the hysteresis effect is.The deflection basin parameters such as D_(0)and D_(0)-D_(20)all increase with the increase of temperature and decrease with the increase of moving speed.The increase of pavement thickness and base thickness will reduce the pavement deflection,and the change of base thickness has less influence on pavement deflection.There is a power function relationship between the modulus of surface,base and foundation and the corresponding deflection basin parameters,and the sensitivity of deflection index to the modulus of base is relatively low.Based on 2401 groups of data obtained by COMSOL parametric scanning,the decision tree algorithm is applied to data mining,and it is found that the influence of surface layer thickness,temperature and speed on TSD measurement results decreases in turn.Taking the simulation result of falling weight deflectometer(FWD)as the standard value of deflection detection,a correction model of TSD deflection measurement result is established by using the method of multiple regression,which can better correct the influence of pavement thickness,temperature and vehicle speed.

关 键 词：道路工程 因素分析 有限元建模 高速弯沉仪 承载能力 动态弯沉 

分 类 号：U416.217[交通运输工程—道路与铁道工程]