季节冻土区防冻胀护道对保温路基地温特征影响效果研究  

Study on the Temperature Field of Insulated Roadbed with Frost-Resistant Berm on Seasonal Frozen Region

作　　者：许健[1,2] 牛富俊[1,3] 牛永红[1] 林战举[1] 徐志英[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]中交第一公路勘查设计研究院有限公司多年冻土区公路建设和养护技术交通行业重点试验室,陕西西安710068

出　　处：《铁道学报》2011年第3期84-90,共7页Journal of the China Railway Society

基　　金：中国科学院知识创新工程重要方向项目(kzcx3-sw-351);国家高技术研究发展计划(863计划)(2008AA11Z103);国家自然科学基金(41030741)

摘　　要：运用土壤冻结条件下水热耦合输移基本方程及数值方法,考虑在铺设保温层情况下,加铺防冻胀护道对路基地温特征的影响规律,并与未加铺防冻胀护道的情况进行对比分析。结果表明:铺设保温材料对减小路基中部附近土体季节冻结深度有明显作用,但对路基两侧冻结深度影响相对较小;加铺防冻胀护道对边坡下土体季节冻结深度有一定程度的抬升作用,上升幅度由路基坡脚向路肩逐渐减小,但对路基中部附近土体季节冻结深度影响甚微;保温板-防冻胀护道复合路基结构形式,充分利用两种措施优点,对路基中心、路肩以及坡脚下最大冻结深度抬升的综合效果更好,抬升最大值分别为1.48、1.01、0.68 m。The coupled heat-fluid transport equation and numerical method are employed to analyze the temperature field of the insulated roadbed with and without a frost-resistant berm.The results indicate that the insulation has an obvious effect on reducing the seasonal frozen depth below the central part of the roadbed,while it affects the frozen depth under the side slope to a smaller degree.The frost-resistant berm can reduce the frozen depth under the side slope.The amount of reduction becomes smaller from the shoulder to the toe of the embankment.However,it affects the frozen depth below the central part of the roadbed slightly.The insulated embankment with a frost-resistant berm has virtues of the insulation board and the frost-resistant berm.Therefore,it has a better effect on reducing the maximum frozen depth below the center,the shoulder and the toe of the embankment than the common embankment,with the maximum values of 1.48,1.01,0.68 m,respectively.

关 键 词：季节冻土区 保温板 防冻胀护道 路基 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU471.7[建筑科学—结构工程]