多年冻土区青藏公路路基边界温度及计算模型研究  

Study on the temperature boundary of embankment and its calculation model of the Qinghai-Tibet Highway in permafrost area

作　　者：易鑫[1,2] 胡达[1,2] 喻文兵[1] 刘伟博[1] 

机构地区：[1]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100010

出　　处：《冰川冻土》2017年第2期336-342,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41571070);国家基础科学发展计划(973计划)项目(2012CB026);冻土工程国家重点实验室自主课题(SKLFSE-ZT-21)资助

摘　　要：温度边界是冻土工程模拟中重要的边界条件之一。依据青藏公路多年冻土段不同走向路基断面表层温度的连续观测数据,分析了青藏工程走廊内路基实测的边界温度特征。结果表明:走向为W8°S的断面阴阳坡温差最大为5.81℃,走向为W34°S的断面坡面温差为5.68℃,走向为W86°S度的断面坡面温差为1.38℃,说明高原上无论路基走向如何,路基两侧坡面都存在温度差异,因此,两侧必须采取差异设计,以减少路基温度的不对称。同时,根据路基接收太阳能辐射反演路面及边坡表面温度,提出了工程热边界的简化计算模型,并将模型计算结果与实测数据进行对比,两者吻合较好。The temperature,which is the most important boundary condition for continuous action,is very close to the evaluation of thermal stability.Based on the observation data of the surface temperature（5 cm） in different section along Qinghai-Tibet engineering corridor,boundary temperature characteristics are analyzed in the paper.According to the results,Thetemperature differences between north-faced and south-faced slope are5.81 ℃,5.68 ℃ and 1.38 ℃ with roadbed trends of W8° S,W34°S and W86° S,respectively,which indicating that there exist temperature differences between the north-faced and south-faced slope of the highway regardless of roadbed trend.Hence,the subgrade must take different designs on both sides of the embankment to reduce the asymmetry of temperature.Furthermore,based on retrieving the ground surface temperature by the surface absorption radiation,a simplified calculation model of engineering temperature boundary is proposed,which shows a good agreement with observation data and it can provide important boundary conditions for numerical simulation.

关 键 词：青藏工程走廊 边界温度 路基 计算模型 太阳辐射 

分 类 号：U416.168[交通运输工程—道路与铁道工程]