青藏高等级公路通风管试验路基降温效果  

Cooling effect of ventilated experimental embankment of Qinghai-Tibet high-grade road

作　　者：张坤[1] 李东庆[1] 李建宇[2] 童刚强[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [2]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《浙江大学学报（工学版）》2010年第10期1845-1850,共6页Journal of Zhejiang University：Engineering Science

基　　金：中国科学院西部行动计划(二期)资助项目(KZCX2-XB2-10);国家自然科学基金资助项目(40671039);国家"863"高技术研究发展计划资助项目(2008AA11Z103);冻土工程国家重点实验室基金资助项目(SKLFSE-ZY-03)

摘　　要：在假定未来50a气温升高2.6℃和初始年平均气温为-4.0℃的前提下,应用有限体积法(FVM)对青藏高等级公路试验示范工程段普通路基、普通通风管路基和通风管-XPS复合路基温度场进行三维非线性分析.结果表明,普通路基下部冻土退化严重,第50年的最大融化深度为10.98m,冬季土体中有融化核存在.普通通风管路基和通风管-XPS复合路基在一定时期内可以降低下部多年冻土的温度,提高0℃等温线,且通风管-XPS复合路基的降温效果略优于普通通风管路基,但在气温不断升高和沥青路面吸热的双重影响下,这2种路基的坡脚处会出现融化核,且0℃等温线已经延伸到路基中心处,这将直接影响路基的稳定性.Assuming the total rising temperature of 2.6 ℃ in next 50 years and the initial mean annual air temperature of -4. 0 ℃, the three-dimensional temperature fields of the traditional embankment, the ordinary duct-ventilated embankment and the duct-ventilated-XPS embankment were analyzed by the finite volume method （FVM）. Results show that the permafrost underlying traditional embankment is seriously degraded and the thaw depth is 10.98 m at the 50th year, meanwhile there is a thaw bulb in the soil in the winter. Both the ordinary duct-ventilated embankment and the duct-ventilated-XPS embankment can cool down the permafrost and uplift the 0℃ isotherm beneath the embankments. The cooling effect of the duct-ventilated-XPS embankment is slightly better than that of the ordinary duct-ventilated embankment, but the thaw bulbs will appear under the slope toes due to the climate warming and the heat absorption of asphalt pavement, and the 0 ℃ isotherm is extended to the center of embankment, which will affect the thermal stability of embankment.

关 键 词：普通通风管路基 通风管-XPS复合路基 多年冻温度场 三维非线性分析 气候变暖 

分 类 号：U416.1[交通运输工程—道路与铁道工程]