摘要
依托实际工程,基于现场检测和三维有限元模拟技术,研究动载作用下半刚性基层沥青路面动力响应。首先,基于光纤光栅传感技术进行半刚性基层沥青路面动力响应现场测试,依据现场测试结果,确定有限元瞬态分析的动力学原理、荷载条件、边界条件及材料参数,建立沥青路面三维有限元模型;然后分析不同轴载及材料参数下路面结构内部的动力响应特征。结果表明,动载作用下,车速越低,路面结构受力状态越不利;纵向(行车方向)拉应变大于横向拉应变;随轴载的增大,路面结构的应变响应波动性增强,沥青层内部拉压应变交替变化剧烈;面层模量对路基顶压应变的影响程度显著于基层模量,基层模量则对面层底拉应变影响较大。
Relying on the real project,the dynamic response of semi-rigid base asphalt pavement under moving vehicle load is studied based on the field test and 3D finite element simulation. First,the field test of the dynamic response of semi-rigid base asphalt pavement is conducted using fiber grating sensing technology.The dynamic theory,the moving vehicle load condition,the boundary condition and the structural parameters for the FE transient analysis are determined according to the field test result,and a 3D finite element model of the asphalt pavement is established. Then,the internal dynamic response feature of the pavement under different axle loads and material parameters are analysed. The result indicates that（ 1） under moving vehicle load,the stress state of the pavement tends to adverse with the decreasing of vehicle speed;（ 2） the longitudinal（ the same as the driving direction） tensile strain is greater than the transverse tensile strain;（ 3）as the load increases,the volatility of strain response of the pavement is enhanced,and the tensile and compressive strains in the asphalt layer change alternately and dramatically;（ 4） the effect of surface modulus on the compressive strain on the top of subgrade is more significant than the base modulus,but the base modulus has a great impact on tensile strain at the bottom of surface.
出处
《公路交通科技》
CAS
CSCD
北大核心
2016年第10期19-24,共6页
Journal of Highway and Transportation Research and Development
基金
河北省高等学校科学技术研究项目(ZD2014099)
河北省教育厅青年基金项目(QN2015036)
关键词
道路工程
沥青路面
光纤光栅传感技术
动力响应
应变
数值模拟
road engineering
asphalt pavement
fiber grating sensing technology
dynamic response
strain
numerical simulation
