季节性冻土区高速铁路换填路基冻结特征的有限元分析  

FINITE ELEMENT ANALYSIS ON FROZEN CHARACTERISTIC OF ROADBED WITH EXCHANGE FILLING MATERIAL IN HIGH-SPEED RAILWAY IN SEASONAL FROZEN GROUND

作　　者：刘华[1,2,3] 牛富俊[1,4] 牛永红[1] 林战举[1] 鲁嘉濠[1,2,5] 

机构地区：[1]冻土工程国家重点实验室中国科学院寒区旱区环境与工程研究所,兰州730000 [2]中国科学院大学,北京100049 [3]西安建筑科技大学土木工程学院,西安710055 [4]中交第一公路勘察设计院集团有限公司多年冻土区道路建设与养护行业重点实验室,西安710068 [5]煤炭资源与安全开采国家重点实验室重庆研究中心(重庆地质矿产研究院),重庆400042

出　　处：《工程地质学报》2013年第4期516-524,共9页Journal of Engineering Geology

基　　金：科技部973计划项目(2012CB026101);自然科学重点基金项目(41030741);创新群体项目(41121061)资助

摘　　要：运用土壤冻结融化条件下热传导的基本方程和数值理论方法,结合哈大客运专线具体工程,通过模拟分析在不同的路基高度、几何断面选型、填料选择和施工、竣工季节条件下,对比分析了换填路基结构不同部位的季节性最大冻结深度在今后50a内随着时间在全球升温的背景趋势下的变化规律。通过分析并讨论换填路基的热状况特征及其分布变化规律,在数值模拟结果的基础上,结合季节性冻土区高速铁路无碴轨道路基结构的特点,总结并提出了较为合理的换填路基高度、几何结构形式选型、路基填料的选择分类以及路基施工和竣工季节,并通过以上结果分析评价了换填后路基的整体热稳定性。Frost heave has caused serious damage to railway roadbeds in seasonal frozen regions.Therefore,frost heave prevention is the basic principle of roadbed design in seasonal frozen regions.It is a rigorous task because of the strict demand of the deformation in high-speed railway.The heat transport equation and two-dimensional finite element method are employed to simulate the maximum frozen depth in the coming 50 years.The simulation consider the warming environment temperature in the conditions of different depths,shapes,filling materials,and construction seasons.It studies the roadbed temperature field of different parts in high-speed railway.Based on the numerical simulation,appropriate depth,shape,filling material and construction season are proposed for exchange filling material roadbed design.The relationship between the railroad and the railway thermal stability is analyzed as well.

关 键 词：季节性冻土区 换填法 高速铁路路基 数值分析 哈大客运专线 

分 类 号：U213.1[交通运输工程—道路与铁道工程]