关中国省干线公路沥青路面预防性养护阈值研究

Study on Preventive Maintenance Threshold Value of National and Provincial Trunk Roads Asphalt Pavement in Guanzhong Area

基于关中地区国省干线公路典型养护工程检测结果,采用S型曲线模型,对PCI、RQI等路况评价指标进行回归分析,拟合路面性能衰减曲线,对比不同组合下的PCI、RQI模型参数,分析面层厚度及交通量对预防性养护PCI、RQI阈值的影响。研究表明:S型路面性能衰减模型与路面性能衰减规律吻合度佳,其相关系数R2高于0.95;路面性能衰减函数中,|PCI"|、|RQI"|最大值对应的路况评价指标可作为预防性养护阈值,其中,预防性养护PCI阈值取85.0,RQI阈值取84.0。

Based on the test results of typical maintenance projects of national and provincial trunk highways in Guanzhong area,this paper uses S-curve model to make regression analysis on PCI,RQI and other road condition evaluation indexes,fit the pavement performance attenuation curve,compare the parameters of PCI and RQI models under different combinations,and analyze the influence of surface thickness and traffic volume on PCI and RQI threshold value of preventive maintenance.The results show that:the S-type pavement performance attenuation model is in good agreement with the pavement performance attenuation law,and its correlation coefficient R~2 is higher than 0.95;the road condition evaluation index corresponding to the maximum values of|PCI "|,|RQI" |in the pavement performance attenuation function can be used as the preventive maintenance threshold value,in which the preventive maintenance PCI threshold value is 85.0 and RQI threshold value is 84.0.