摘要
为了评价行驶速度对高速弯沉仪检测结果的影响,利用三维有限元软件,通过设置黏弹性材料参数及外部子程序VDLOAD的移动荷载速度,从理论上模拟分析了行驶速度的影响,并选取试验路进行了实际验证。结果表明:随着行驶速度的增加,路表理论弯沉逐渐减小,这是由于沥青层黏弹性引起的;在行驶速度为5.4 km/h^108 km/h之间,以50 km/h时弯沉为基准,理论弯沉变化幅度为35.8%^-5.9%;试验路测试时,弯沉速度变异性为3.5%,满足规范要求不大于5%。建议高速弯沉仪保持匀速行驶,速度保持在50 km/h^70 km/h。
In order to evaluate the impact of driving speed on the detection results of the High Speed Deflectometer(HSD),using three-dimensional finite element software,by setting the viscoelastic material parameters and the moving load speed through the external subroutine VDLOAD,the influence of the driving speed is simulated and analyzed theoretically,and the test road is selected to verify the influence.The results show that as the driving speed increases,the theoretical deflection of the road surface gradually decreases,which is caused by the viscoelasticity of the asphalt layer.When the driving speed is between 5.4 and 108 km/h,based on the deflection at 50 km/h,the theoretical deflection range is 35.8%^-5.9%.In the field test,the variability of the deflection speed is 3.5%,which meets the specification requirement≤5%.It is recommended that the HSD keeps driving at a constant speed,and the speed is maintained at 50 km/h^70 km/h.
作者
臧国帅
金光来
Zang Guoshuai;Jin Guanglai(Jiangsu Sinoroad Engineering Technology Research Institute Co.,Ltd.,Nanjing 211086,China)
出处
《山西建筑》
2020年第21期102-104,共3页
Shanxi Architecture
基金
江苏省国际科技合作项目(BZ2019060)。
关键词
道路工程
高速弯沉仪
有限元
移动荷载
行驶速度
road engineering
high speed deflectometer
finite element
moving load
driving speed
