宁夏不同地区道路冻害典型特征及形成机制对比分析  

Comparative Analysis on Typical Characteristics and Formation Mechanism of Road Frost Damage in Different Regions of Ningxia

作　　者：严宏伟 文良东 YAN Hong-wei;WEN Liang-dong(CCCC Infrastructure Maintenance Group Co.,Ltd.,Beijing 100011,China)

机构地区：[1]中交基础设施养护集团有限公司,北京100011

出　　处：《公路交通科技》2023年第4期78-87,共10页Journal of Highway and Transportation Research and Development

基　　金：宁夏回族自治区重点研发计划项目(2021BDE931020)。

摘　　要：为了研究宁夏不同地区道路因受气候、环境及周期性冻融循环等因素对路基路面的影响,整合了宁夏不同地区季节冻土区冻融特征,并对宁夏不同地区道路的冻害、道路状况的影响及成因进行了分析。通过文献查阅及实地调研的方法,依据相关道路资料,对宁夏开展了全线道路病害研究。选取宁夏地区北部、中部及南部部分市区内道路、部分国道及省道典型路段,归纳总结了宁夏地区公路路面病害的特征。依据《公路技术状况评定标准》(JTG5210—2018)利用PQI指数对所选道路技术状况进行了评价,对产生宁夏道路冻害的成因及形成机制进行了剖析。结果表明:宁夏季冻区气温、降水等相关因素时空变化特征具有很强的地域性;宁夏不同地区病害存在差异,但以裂缝病害为主,道路都表现出不同形态裂缝;宁夏不同地区道路的路面总体性能以优良为主,北部、中部使用性能稍优于南部;宁夏不同地区公路病害主要是由冻害引起,温度场变化、循环冻融作用及交通荷载等因素相互影响,导致公路冻害的发生。本结果将为宁夏全域季节冻土区工程实践中的道路建设、合理设计与运营提供借鉴和参考,对季节冻土区道路病害的预防具有重要意义。In order to study the influence of climate,environment and periodic freeze-thaw cycle on the road subgrade and pavement in different regions of Ningxia,the freeze-thaw characteristics of seasonally frozen soil areas in different regions of Ningxia are integrated,and the influences and causes of road frost damage and road conditions in different regions of Ningxia are analyzed.By means of literature review and field investigation,and based on relevant road data,the research on the road diseases throughout Ningxia is carried out.Selecting typical sections of roads in the northern,central and southern parts of Ningxia,and some national and provincial roads,the disease characteristics of road pavement in Ningxia are summarized.According to Standards for Technical Condition Evaluation of Highway Bridges(JTG5210-2018),the technical condition of selected roads is evaluated by PQI index,the causes and formation mechanism of road frost damage in Ningxia are analyzed.The result shows that(1)the spatio-temporal variation characteristics of temperature,precipitation and other related factors in the seasonally frozen regions of Ningxia are highly regional;(2)there are differences in diseases in different regions of Ningxia,but cracks are the main diseases,and roads show different forms of cracks;(3)the overall pavement performance of roads in different regions of Ningxia is mainly excellent,and the service performance in the northern and central regions is slightly better than that in the south region;(4)the road diseases in different regions of Ningxia are mainly caused by frost damage,the changes of temperature field,the cyclic freeze-thaw effect and the traffic load interact with each other,leading to the occurrence of road frost damage.The result will provide reference for road construction,reasonable design and operation in the engineering practice in the seasonally frozen regions of Ningxia,and have important significance for the prevention of road diseases in the seasonally frozen regions.The research will provide refe

关 键 词：道路工程 公路病害特征 形成机制 季节冻土区 区域 

分 类 号：U419[交通运输工程—道路与铁道工程]