内蒙古重载交通半刚性基层沥青路面预防性养护时机研究  

Research on Preventive Maintenance Timing of Heavy Traffic Semi-rigid Asphalt Pavements in Inner Mongolia

作　　者：马建国 刘国鑫 张楠 MA Jian-guo;LIU Guo-xin;ZHANG Nan(College of civilengineering,Inner Mongolia University of Technology,Hohhot 010051,China;Hohhot City Highuuay Survey and Design Institute Co.Ltd.,Hohhot 010010,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]呼和浩特市公路勘察设计院有限责任公司,内蒙古呼和浩特010010

出　　处：《内蒙古工业大学学报（自然科学版）》2019年第5期384-389,共6页Journal of Inner Mongolia University of Technology：Natural Science Edition

摘　　要：依据内蒙古地区不同建设期典型半刚性基层沥青路面结构和交通状况调查,建立路面结构有限元模型并确定荷载参数,考虑路面结构典型破坏模式,结合半刚性基层材料疲劳试验规律,计算分析了路面结构在材料模量衰减、不同重载作用下,半刚性基层层底拉应变值及其变化规律,得出:层底拉应变随路面结构层模量的衰减、荷载的增加,呈现逐渐增加的趋势,该趋势在基层材料模量衰减至初始值40%后更加明显;疲劳破坏拉应变限值位于基层材料模量初始值40%~60%对应的拉应变之间,建议将该模量范围作为预防性养护时机的依据.ased on the survey data of typical semi-rigid base asphalt pavement structures of different construction periods and traffic conditions in Inner Mongolia,a finite element analysis model of pavement structure is established and the load parameters are determined.Considering the typical failure modes of pavement structure,combining with the fatigue test findings of semi-rigid base materials,the tensile strain value of the semi-rigid base layer is calculated and its variation tendency is analyzed,under the effects of pavement structure material modulus attenuation and different heavy loads.The results show that the layer bottom tensile strain increases gradually with the attenuation of the pavement structure layer material modulus and the increases of loads and this increasing trend is more obvious after the value is attenuated to 40%of the initial modulus value of the base material.In addition,the results also indicate that the fatigue failure tensile strain limits fall into the range of the tensile strain values corresponding to the range from 40%to 60%of the initial modulus value of the base material.It is suggested that this modulus range is used as the basis for the timing of preventive maintenance.

关 键 词：半刚性基层 疲劳试验 有限元模型 预防性养护时机 

分 类 号：O175.2[理学—数学]