多年冻土区宽幅路基温度与变形规律试验研究  

Experimental Study on Temperature and Deformation Regularity of Wide Embankment in Permafrost Regions

作　　者：陈冬根[1] 朱英珍 CHEN Dong-gen;ZHU Ying-zhen(State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, Ministry of Transport,CCCC First Highway Consultants Co.Ltd.,Xi'an 710065,China;CCCC RUITONG Road & Bridge Maintenance Technology Co.Ltd,Xi'an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司高寒高海拔地区道路工程安全与健康国家重点实验室,西安市710065 [2]中交瑞通路桥养护科技有限公司,西安市710075

出　　处：《公路》2019年第2期1-7,共7页Highway

基　　金：国家科技支撑计划;项目编号2014BAG05B01;2014BAG05B03;交通运输部科技项目;项目编号2013 318 490 010;2012 319 495 030

摘　　要：为研究黑色沥青路面吸热对多年冻土区宽幅路基的热影响问题,以共和～玉树公路宽幅路基为原型,进行了室内模型试验,研究了多次冻融循环作用下沥青路面吸热对宽幅路基温度场与变形分布影响。研究结果表明:经过3个冻融循环周期的运行,沥青路面下伏土体温度逐渐升高,具体表现在0℃等温线位置出现明显下降,其中,第一周期融化结束时路中部位0℃等温线处于72cm深度位置,第二周期融化结束时0℃等温线处于39cm深度位置,第三周期结束时路中部位冻土几乎全部消失;沥青路面吸热导致冻土融化产生变形,经历3次冻融循环以后路中顶面、左路肩顶面变形量依次达到49.92mm、43.24mm;路基变形分布中饱冰冻土层变形占总变形比例最大,其次为浅地表层变形,最后为路基填土变形。In order to study the impact of heat-absorption of black asphalt pavement on the wide embankment in permafrost regions,a laboratory test is designed by taking the wide embankment of Gonghe-Yushu Highway as a background.The influence of thermal absorption of black asphalt pavement on the temperature field and deformation distribution of wide embankment is analyzed under multiple freeze-thaw cycles.The results show that after three freeze-thaw cycles,the temperature of the soil under the asphalt pavement gradually increases,which is reflected in obvious decline in the position of the 0℃ isotherm.Among them,the 0℃ isotherm of the central cross section of the embankment at the end of the first and second cycles of melting are at the depth of 72 cm and 39 cm respectively.At the end of the third cycle,the permafrost almost disappears completely.The heat absorption of asphalt pavement causes the melting of permafrost beneath the embankment,which results in deformation.After three freeze-thaw cycles,the deformations on the top surface of the middle cross section and the left shoulder of embankment respectively reach 49.92 mm and 43.24 mm.In the distribution of embankment deformation,the percentage of the ice-saturated permafrost is the largest,then is the shallow surface layer and embankment in turn.

关 键 词：多年冻土 宽幅路基 冻融循环 温度 变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]