摘要
基于结构动力学基本理论,建立路面结构动力有限元数值分析模型,系统地分析了FWD测试荷载的动力特性及层间接触状态对于半刚性基层沥青路面模量参数反分析结果的影响规律。研究结果表明:忽略测试荷载的动力特性,采用传统拟静力反分析方法进行半刚性基层沥青路面模量参数的反演分析,将使沥青面层及路基的模量被高估,其值分别为16.0%和8.7%,而使基层模量被低估3.4%;层间非连续接触行为对沥青面层与路基模量参数的反演结果影响不大,但使基层模量反演值显著偏低,仅为理论反演值的40～43%。研究结果为基于FWD测试技术有效地进行半刚性基层沥青路面结构层模量参数的反演分析提供了前期理论依据。
Based on the basic theory of structure dynamics,a dynamic finite element model was established.The influences of the dynamic characteristics of the falling weight deflectometer(FWD) testing load and the interface contact condition on the back-analysis results of the modulus parameters of a semi-rigid basement's asphalt pavement were studied.The analysis results demonstrated that,without considering dynamic characteristics of the FWD testing load,with a quasi-static analysis method,the modulus back-calculation results of the asphalt wearing course and subgrade could be overestimated by 16.0% and 8.7% respectively,whereas,the modulus value of the basement course could be underestimated by 3.4%.The interface discontinuous contact condition should cause the basement layer modulus to be lower significantly.The ratio between back-calculation and theoretical values was 40% to 43%.The research results provided a theoretic basis to popularize the FWD technology application in performing modulus parameter back-analysis of semi-rigid basement's asphalt pavement.
出处
《交通运输工程与信息学报》
2010年第4期43-48,共6页
Journal of Transportation Engineering and Information
基金
国家自然科学基金项目(50908176)
浙江省教育厅科研基金项目(Y200909200)资助
