摘要
为了延长公路使用年限并提高长寿命复合路面的建设和养护水平,以尉许高速公路为依托,开展加铺层寿命预估年限计算方法的研究。通过有限元软件模拟复合式路面沥青加铺层层底的应力状况,分析应力强度因子出现负值的原因,并提出从能量角度出发,将几种不同类型的应力强度因子耦合为一个等效应力强度因子的方法。基于Paris公式,提出一种利用有限元模型中加铺层层底应力强度因子来计算加铺层开裂年限的新方法。结果表明:1)沥青加铺层与水泥混凝土板之间的良好黏结抑制了沥青加铺层层底的弯拉变形,因此路面不易产生张拉型反射裂缝;2)随着荷载从右向左移动,剪切型荷载应力强度因子呈现中心对称分布,裂缝经历了两次方向相反的剪切作用;3)基于Paris公式和有限元模型的特点,计算了5种路面结构的开裂年限,结果与实际情况较为符合。
In order to extend the service life of highway and improve the construction and maintenance level of long-life composite pavement,the calculation method of the estimated life of the pavement is carried out based on the Weixu expressway.The stress conditions of the asphalt overlay of composite pavement are simulated by finite element software,the reasons for the negative value of the stress intensity factor are analyzed,and a method of coupling several different types of stress intensity factors into an equivalent stress intensity factor is proposed from the perspective of energy.Based on the Paris formula,a new method is proposed to calculate the cracking age of the overlay using the stress intensity factor of the overlay in the finite element model.The results show that:1)The good bonding between the asphalt overlay and the cement concrete slab inhibits the bending and tensile deformation of the bottom of the asphalt overlay,so the pavement is not prone to tensile reflection cracks.2)As the load moves from right to left,the stress intensity factor of shear load is distributed symmetrically,and the crack experiences two shear actions in opposite directions.3)Based on the characteristics of the Paris formula and the finite element model,the cracking years of the five pavement structures are calculated,and the results are more consistent with the actual situation.
作者
张喜民
成高立
陈律
宋子豪
王选仓
ZHANG Ximin;CHENG Gaoli;CHEN Lu;SONG Zihao;WANG Xuancang(Shaanxi Traffic Control Municipal Road&Bridge Group Co.,Ltd.,Xi’an 710065,Shaanxi,China;Shaanxi Motorway Mechanization Engineering Co.,Ltd.,Xi'an 710038,Shaanxi,China;Chang'an University,Xi'an 710064,Shaanxi,China)
出处
《工程建设》
2025年第8期41-47,共7页
Engineering Construction
基金
2018年交通运输部交通运输行业重点科技资助项目(2018-MS2-042)
陕西省交通运输厅科研资助项目(20-24K、20-25X、20-32K)。
