基于实测验证的沥青路面力学模型研究(修改稿).doc

基于实测验证的沥青路面力学模型研究 白琦峰1 钱振东（1.， 100018； 2. 江苏 南京 211112） 摘 要：实测不同路面结构温度、应变数据，与不同路面力学模型、参数的计算结果对比，研究与路面实际受力更为相符的力学模型和材料力学参数。研究的模型包括动态有限元模型、静态有限元模型、弹性层状体系等，力学参数包括动态模量、静态模量等。同时对不同路面结构的层间连续状态进行分析；并研究了路面力学指标计算结果的修正方案。研究表明，基于动态模量的弹性层状体系是用于路面力学分析的理想模型，力学模型中柔性路面、组合式基层沥青路面层间状态可假设为连续，半刚性基层与沥青面层间合适的摩擦系数为0.65~0.75。采用本文提出的修正方案，不同路面结构的力学分析结果与实测结果的相关系数R2可达到0.9。 关键词：力学响应模型；动态模量；修正方案；层间连续状态 Study on Asphalt Pavement Mechanical Model Based on Calibration of Measured Strain Bai Qi-feng1，Qian Zhen-dong（jing 100018 2. Souhteast University, Jiang Su， Nanjing 210008） Abstract: Asphalt pavement’s temperature and strain under different load methods were measured. Based on contracting the measured and the calculated strains, pavement mechanical model and parameters which can agree with the actual pavement more closely. The mechanical models being studied includes dynamic/static finite element model, muli-layered elastic model. The mechanical parameters being studied include dynamic modulus, static modulus, etc. The interface continuity conditions of different type of pavement were studied. Finally, amendment method of pavement calculated strain was studied. It was found that muli-layered elastic model using dynamic modulus is the good choice for pavement mechanical analysis. As for the layers interface continuity condition, flexible pavement and combined base pavement is continuous, however semi-rigid base pavement is semi-continuous with friction coefficient of 0.65~0.75. With amending recommended, the correlation coefficient R2 is about 0.9. Keywords: Pavement Mechanical Model, dynamic modulus, amendment method, interface continuity condition 0 引言 路面力学计算模型是沥青路面研究的重要方向，其方法主要包括解析法和有限元法等。解析法如运用双参变量的Stockes变换，求得任意边界条件矩形板弯曲问题的一般解析解[1]，以及用CC 型级数求得弹性地基上自由边矩形板弯曲问题的解析解[2]，Liang[3] 则是通过解析法为力学模型建立了FWD的反演模型。而在已有的有限元分析中，Lee[4]用ABAQUS对FWD模型进行二维动力有限元分析。Karadelis[5]和Bozkurt[6] 用三维有限元的网格分析了路面受力等等。不同的力学计算模型，由于采用不同的材料参数，计算结果相差较大，而模型以及材料参数与路面实际受力的一致性，则需要理论计算结果与实测结果的对比进行验证。出于路面力学实测异常困难的缘故，目前国内对力学计算结果的验证研究较少。