Abstract：To analyze the deflection basin curve characteristics of semi-rigid base asphalt pavement under FWD load, a dynamic finite element model was established. By changing the modulus and thickness of the structural layer, the influence of geometric parameter index and strength change of each structural layer on the curve of deflection basin was analyzed. The results show that the area index A3 can better evaluate the overall strength of the pavement. When the modulus ratio E1/E2 is greater than 0.5, d0/d1 is only related to the surface modulus value. The cubic-polynomial fitting curve of the deflection basin and the radius of curvature at a distance of 0.15 m from the load center have a highly linear correlation with the modulus of surface layer and base layer. The effect of the surface layer modulus is mainly in the range of C1~C2, and the effect of the base layer modulus is mainly manifested at d8. Controlling the change of single variable (modulus), the strength of pavement structure is the most sensitive to the change of subgrade modulus; controlling the change of single variable (thickness), the strength of pavement structure is the most sensitive to the change of subgrade thickness.
［1］ 交通运输部.2017年交通运输行业发展统计公报［EB/OL］.(2018-05-30)［2019-03-13］.http:∥xxgk.mot.gov.cn/jigou/zhg hs/201806/t20180622_3036269. html.
Ministry of Transport. 2017 Development Statistics Bulletin of Transporta-tion Industry［EB/OL］. (2018-05-30)［2019-03-13］. http:∥ xxgk.mot.
gov.cn/jigou/zhghs/201806/t20180622_3036269. html.
［2］ 元松，单景松.基于FWD的柔性路面结构动力响应数值分析［J］.长沙交通学院学报，2006，22(2)：33-37.
YUAN Song, SHAN Jingsong. Thenumerical analysis of dynamic response of flexible pavement based on FWD［J］. Journal of Changsha Communications University, 2006, 22(2): 33-37.
［3］ 曾杰，肖川，李保险，等.FWD荷载下沥青路面动力响应的温度影响作用研究［J］.公路工程，2015，40(1)：107-111.
ZENG Jie, XIAO Chuan, LI Baoxian, et al. Study ondynamic response of asphalt pavement under FWD load base on different temperature conditions［J］. Highway Engineering, 2015, 40(1): 107-111.
［4］ 窦光武，沙爱民.落锤式弯沉仪(FWD)时程曲线特征参数分析［J］.公路交通科技(应用技术版)，2010(3)：74-76.
DOU Guangwu, SHA Aimin. Characteristic parameters analysis of time-lapse curve of drop weight deflectometer(FWD)［J］. Highway Transportation Technology (Application Technology Edition), 2010(3): 74-76.
［5］ 张邹.FWD荷载作用下沥青路面动力响应及反演研究［D］.长沙：湖南大学，2013：4-7.
ZHANG Zou. Research of Dynamic Response and Modulus Backcalculated of Asphalt Pavement Based on FWD Load［D］. Changsha: Hunan University, 2013: 4-7.
［6］ 杨庆振，马士杰.FWD弯沉盆几何参数与路面结构强度关系分析［J］.山东交通科技，2015(5)：61-64.
YANG Qingzhen, MA Shijie. Analysis of relationship between FWD deflection basins geometrical parameters and pavement structure strength［J］. Shandong Transportation Science and Technology, 2015(5): 61-64.
［7］ 中交路桥技术有限公司.公路沥青路面设计规范：JTG D50—2017［S］.北京：人民交通出版社，2017.
CCCC Road and Bridge Technology Co., Ltd. Specifications for Design of Highway Asphalt Pavement: JTG D50—2017［S］. Beijing: China Communications Press, 2017.
［8］ 侯芸，郭忠印，田波，等.动荷作用下沥青路面结构的变形响应分析［J］.中国公路学报，2002，15(3)：6-10.
HOU Yun, GUO Zhongyin, TIAN Bo, et al. Dynamic deflection response of layered pavement structure subjected to dynamic load［J］. China Journal of Highway and Transport, 2002, 15(3): 6-10.
［9］ XU Bing. Assessing Pavement Layer Condition Using FWD Deflection Data［D］. North Carolina, USA: North Carolina State of University, 2000.
［10］ 黄志义，陈雅雯，颜可珍.非均布移动荷载作用下黏弹性沥青路面动力响应分析［J］.重庆交通大学学报(自然科学版)，2017，36(3)：30-35.
HUANG Zhiyi, CHEN Yawen, YAN Kezhen. Dynamic response of viscoelastic asphalt pavement under non-uniform moving load［J］. Journal of Chongqing Jiaotong University(Natural Science), 2017, 36 (3): 30-35.
［11］ 黄兵，周正峰，贾宏财，等.半刚性基层沥青路面结构动力响应分析［J］.重庆交通大学学报(自然科学版)，2014，33(1)：47-51.
HUANG Bing, ZHOU Zhengfeng, JIA Hongcai, et al. Dynamic response of semi-rigid base asphalt pavement［J］. Journal of Chongqing Jiaotong University(Natural Science) , 2014, 33(1): 47-51.
［12］ 王旭东，郭大进，邓学均.动态弯沉盆几何特性分析［J］.东南大学学报(自然科学版)，1999，29(5)：115-120.
WANG Xudong, GUO Dajin, DENG Xuejun. Geometric charac-teristic analyze of the dynamic deflection basin［J］. Journal of Southeast University (Natural Science Edition), 1999, 29(5): 115-120.
2020, Vol. 39 
