青藏铁路多年冻土区保温护道路基温度场数值模拟研究  

Numerical Simulation of the Temperature Regime within an Embankment with Insulated Berm of the Qinghai-Tibet Railway

作　　者：葛建军 

机构地区：[1]中铁第一勘察设计研究院地质路基处,陕西西安710043

出　　处：《冰川冻土》2008年第2期274-279,共6页Journal of Glaciology and Geocryology

基　　金：科技部科技支撑计划项目(2006BAC07B02)资助

摘　　要：多年冻土区路基铺设保温护道的目的在于削弱边坡热侵蚀作用对路基下多年冻土温度状况的影响,防止多年冻土上限特别是阳坡侧冻土上限下降,减少人为活动对路堤坡脚及附近天然地表的破坏;防止路侧地表积水渗入基底;对边坡产生反压,防止路肩滑塌,以保证路基的稳定.结合试验工程监测资料,采用数值模拟方法分析了青藏铁路多年冻土区路基保温护道的效果,结果表明:保温护道并没有达到设计的目的,由于路基和护道几何形状对空气对流和太阳辐射的影响,不仅达不到保护冻土地基的目的,反而加大阴阳坡温度差异,导致路基病害的发生.The goal of designing an embankment with insulated berm in permafrost regions is to avoid the lateral thermal-erosion of the embankment slopes, to prevent the permafrost table decline and to keep the nearby environment from degrading. And also, it can avoid the embankment eroded by surface water. However, the numerical simulated results based on the monitored data of the experimental section along the Qinghai-Tibet Railway show that insulated berm does not improve the thermal regime of the embankment. It even worsens the regime and might cause longitudinal cracks because of the uneven temperature distribution. Therefore, it is necessary to consider well such a kind of treatment for the embankments in permafrost regions of the Tibetan Plateau.

关 键 词：青藏铁路 多年冻土 保温护道 

分 类 号：U213.14[交通运输工程—道路与铁道工程] P642.14[天文地球—工程地质学]