摘要
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。
Based on the field test data of pavement roughness,the computational parameters of vehicle loads are derived,and they are used to calculate the dynamic responses of road structures.By regarding the road structures as a three-dimensional multi-layered system,the dynamic responses and the influence depth of the road subgrade induced by the moving vehicle load are studied.The governing equations of motion are solved by employing the Fourier transform technique;and the theoretical solutions of the vertical stress of subgrade are deduced with the exact stiffness matrix method.A simplified three-layer structure composed of pavement,subgrade and half-space ground is obtained by employing the method of Odemark equivalent hypothesis of thickness-modulus.Then,the distribution of vertical stress and the influence depth of road subgrade are derived.The influence of different parameters such as load amplitude,equivalent pavement thickness and the subgrade modulus on the influence depth are carefully discussed;and the formulas of subgrade influence depth induced by vehicle loads are further derived.The method developed herein may be used as a preliminary reference in road engineering design.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2013年第2期316-321,352,共7页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51209201
No.51279198)
武汉市青年科技晨光计划项目(No.201150431070)
西部交通建设科技项目(No.2011318493720
No.20113184931700
No.2011318775680)
关键词
影响深度
汽车荷载
精确刚度矩阵法
动力响应
路面不平整
公路工程设计
influence depth
vehicle load
exact stiffness matrix method
dynamic response
pavement roughness
road engineering design
