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根据路面不平整实测资料,获得了汽车动荷载的计算模型和参数,并利用此荷载模式来分析公路结构的动力响应。考虑到公路结构的三维分层性状,利用Fourier变换技术和求解层状结构的精确刚度矩阵法,研究了公路结构在移动汽车荷载作用下的动力响应问题。为了方便工程应用,利用Odemark厚度和模量的当量转换公式,将公路结构简化为由路面、路基及地基组成的3层体系,并以此为基础分析了路基动应力的衰减规律,同时重点研究了汽车轴载大小、当量路面厚度及路基模量对路基工作区深度的影响,最后建议了路基工作区深度的定量表达式,研究结果可为公路路基设计提供参考。
According to the measured data of uneven road surface, the calculation model and parameters of vehicle dynamic load were obtained, and the dynamic response of highway structure was analyzed by using this load model. Considering the three-dimensional layered structure of highway structure, the dynamic response of highway structure under moving vehicle load is studied by using Fourier transform technique and solving the exact stiffness matrix method of layered structure. In order to facilitate the application of the project, the highway structure is simplified into a three-layer system composed of pavement, subgrade and foundation using equivalent conversion formula of Odemark thickness and modulus. Based on the analysis, the decay law of dynamic stress in subgrade is analyzed. At the same time, The influence of vehicle axle load, equivalent road thickness and subgrade modulus on the working zone depth of subgrade is proposed. Finally, the quantitative expression of subgrade working zone depth is proposed. The results can provide references for highway subgrade design.