Measurement Uncertainty Evaluation for Calculation Factor of the Road Dynamic Deflection
DOU Guang-wu1,MIAO Na1,LIU Lu1,ZHANG Bing2
1. Research Institute of Highway Ministry of Transport, Beijing 100088, China
2. National Center of Metrization for Equipment of Road and Bridge, Beijing 101103, China
Abstract：The deflection calculation factor is an important technical index of the FWD accuracy. In order to evaluate the measurement uncertainty of the deflection calculation factor, the definition of deflection calculation factor was determined, and the measurement model was established, the standard deflection sensor, FWD measurement repeatability and linear fitting model were determined as the three main uncertainty components, and the foundation deflection and environmental conditions of the calibration environment were recommended. The experiment result showed that the expansion uncertainty of the deflection calculation factor of the FWD with stable performance was generally between 1.0% and 3.0%, and the linear fit slope was the main influence factor for the measurement uncertainty of the deflection calculation factor.
［1］张克永, 欧东宝. 落锤式弯沉仪在公路工程检测中的应用［J］. 交通标准化, 2014, 42(9): 106-108.
Zhang K Y, Ou D B. Application of FWD in Highway Engineering Detection［J］. Transportation Standardiza-tion, 2014, 42(9): 106-108
［2］Irwin L H, Orr D P, Atkins D. FWD Calibration Center and Operational Improvements: Redevelopment of the Calibration Protocil and Epuipment［R］.
McLean: Research, Development, and Technology Turner-Fairbank Highway Research Center, 2009.
［3］柴彩萍, 邹艳琴. 落锤式弯沉仪(FWD)校准和修正方法研究［J］. 公路工程, 2013, (4): 91-93, 119.
Chai C P, Zou Y Q. Study on the Calibration and Amendment Method of FallingWeight Deflectometer(FWD)［J］. Highway Engineering, 2013, (4): 91-93,119.
［4］中华人民共和国交通运输部. JJG(交通)133-2017 落锤式弯沉仪［S］. 2017.
［5］高哲. 基于落锤式弯沉仪(FWD)的半刚性基层沥青路面结构性能评价［D］. 济南:山东建筑大学, 2016.
［6］张戎. 智能型落锤式弯沉仪系统控制器的产品研制［D］. 南京: 南京航空航天大学, 2008.
［7］许新权,杨 军,吴传海,等. FWD荷载作用下碾压混凝土基层沥青路面的动态响应试验［J］. 江苏大学学报(自然科学版),2019, 40(4): 484-491.
Xu X Q, Yang J, Wu C H, et al. Dynamic response experiment of roller compacted concrete base asphalt pavement under FWD load［J］. Journal of Jiangsu University(Natural Science Edition),2019, 40(4): 484-491.
［8］王复明,李文辉,郭成超,等. 基于高聚物渗透注浆的半刚性基层路面承载性能恢复研究［J］. 北京交通大学学报,2019, 43(3):1-7.
Wang F M, Li W H,Guo C C, et al. Research on bearing performance recovery of semi-rigid base pavement on the basis of permeable polymer grouting［J］. Journal of Beijing Jiaotong University, 2019, 43(3): 1-7.
2020, Vol. 41 
