多年冻土区渗流对路基热稳定性的影响分析  

Analysis on Influence of Seepage Flow in Permafrost Area on Thermal Stability of Roadbed

作　　者：孙文[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《城市道桥与防洪》2012年第2期108-111,11-12,共4页Urban Roads Bridges & Flood Control

基　　金：国家自然基金项目(50678076);国家十一五科技发展支撑计划重点项目(2006BAC07B02)

摘　　要：运用渗流理论和传热学理论,建立了考虑涵前积水下渗情形下,冻土涵洞温度场-渗流场耦合作用的有限元方程,并对暖季涵洞过水情况下,在考虑渗流时普通路基的温度场进行了计算,讨论了渗流对涵洞地基温度场的影响以及涵洞对路基的热稳定性影响。计算结果表明:渗流作用加深了涵洞地基土的季节融化深度,将对涵洞乃至路基的热稳定性造成不利影响。The article applies the seepage flow theory and the thermal transfer theory,and sets up the finite element equation of coupling action of frost culvert temperature field-seepage flow field under the condition of considering the flowage seepage before the culvert,calculates the temperature field of the common roadbed by considering the seepage under the condition of culvert seepage in the warm seasons,and discusses the influence of seepage on the temperature field of culvert subgrade and the influence of culvert on the thermal stability of roadbed.The calculation result shows that the seepage action deepens the season thawing depth of culvert subgrade soil,which will cause the disadvantage effect on the thermal stability of culvert and roadbed.

关 键 词：多年冻土 路基 热管 温度场 热稳定性 

分 类 号：U416.168[交通运输工程—道路与铁道工程]