基于FWD动态弯沉盆参数的沥青路面模量反演分析  

Back analysis on modulus of asphalt pavements based on FWD dynamic deflection basin parameters

作　　者：邱欣[1] 杨青[1] 游庆龙[2] 

机构地区：[1]浙江师范大学工学院,浙江金华321004 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2013年第6期42-48,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：浙江省自然科学基金项目(LY12E08002)

摘　　要：为探讨层间非连续接触行为对半刚性基层沥青路面模量参数反演结果的影响规律，采用动力有限元数值分析方法，利用路表动态弯沉盆参数指标，构建了基于层间完全连续的模量参数反演分析模型，系统地分析了层间非连续接触行为对半刚性基层沥青路面模量参数反演结果的影响规律，提出了充分考虑层间接触状态的模量参数的校正分析方法。分析结果表明：路表动态弯沉盆参数指标与结构层模量参数之间具有良好的相关性；基于路表动态弯沉盆参数指标建立的模量参数反演分析模型具有较高的精度；忽略沥青面层与半刚性基层之间的非连续接触行为，对面层和土基模量的反演结果影响不大，但使基层模量反演结果显著偏低，反演值与理论值的比处于35％～45％之间；引入层间摩阻系数的基层模量参数的校正分析方法合理可行。研究结果为进一步推广FWD在半刚性基层沥青路面路用性能评定中的广泛应用提供了理论和实践依据。In order to study the influence of discontinuous interface contact behavior between as phalt layer and cement treated base layer on back calculation of modulus parameters of asphalt pavements, the finite element analysis was used to create a synthetic database of dynamic deflec tion basin indicators, with which a regression model was established to back calculate modulus parameters of various structural layers. The effect of the discontinuous interface contact condition between asphalt layer and cement treated base on backcalculation results of modulus parameters was analyzed. A correction analytical method considering the discontinuous interface contact com dition was proposed. The results indicate that the dynamic deflection basin indicators are correlated with layer modulus parameters. The modulus parameter backcalculation model based on dy namic deflection basin indicators is of high accuracy. The discontinuous layer interface condition has no effect on modulus backcalculation results of asphalt layers and the subgrade structures, but it causes the backcalculation results of base layer modulus to be lower significantly. The ratio of backcalculation value to theoretical values is from 35 to 45 %. The correction method of layer moduli can objectively determine the performance condition of various structural layers of asphalt pavements. The research shouled be useful to popularize FWD testing technology in evaluating the structure performance of asphalt pavements. 7 tab, 3 figs, 15 refs.

关 键 词：道路工程 沥青路面 落锤式弯沉仪 层间接触 模量反演 

分 类 号：U416.223[交通运输工程—道路与铁道工程]