青藏高速公路宽幅路基温度场模拟分析  

Simulation analysis of temperature field of wide subgrade of Qinghai-Tibet highway

作　　者：汤涛[1] 马涛[1] 黄晓明[1] 廖公云[1] 王飔奇 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2015年第4期799-804,共6页Journal of Southeast University：Natural Science Edition

基　　金："十二五"国家科技支撑计划资助项目(2014BAG05B04);教育部霍英东基金资助项目(141076);东南大学优秀青年教师教学科研资助计划资助项目(2242015R30027)

摘　　要：运用ABAQUS及其二次开发平台,建立了多年冻土地区路基温度场有限元分析模型.运用该模型对低等级公路窄幅路基和高等级公路宽幅路基温度场进行对比分析,对宽幅路基融深变化规律进行了研究.结果表明:不同宽度路基温度随时间均呈周期变化,但每年平均温度呈现总体上升的趋势,且在相同的时间条件下,随着宽度的增加,温度不断上升,但增加幅度逐渐降低;路基中心线处融深随宽度的增加呈三阶段上升趋势,路肩处融深随宽度的增加呈直线上升趋势,坡脚处融深随宽度的增加而增加,但变化幅度很小;增加宽幅路基高度可以在一定程度上起到保护冻土的作用,但路基高度增加到一定值后,继续增加高度对提高冻土上限作用不明显.A finite element （FE） model of temperature field of permafrost subgrade is constructed with ABAQUS and the secondary development platform. Then, the temperature fields of narrow subgrade and wide subgrade are compared and analyzed with the FE model. Furthermore, the change rules of melting depth of wide subgrade are studied. The results demonstrate that the temperatures of subgrades with different widths all change periodically over time, but the mean annual temperature rises. With the increase in the width, the temperature rises but the rate decreases gradually. The melting depth at the centerline shows a three-stage rising trend when the width increases, and the melting depth at the shoulder increases linearly. The melting depth at the basal slope rises with the increase in the width, but the variation is very small. Increasing the height of wide subgrade is help- ful to protect permafrost; however, the effect will reduce after the height reaches a certain value.

关 键 词：多年冻土 有限元分析 宽幅路基 温度场 融深 

分 类 号：U416.168[交通运输工程—道路与铁道工程]