利用封闭式块石护坡调节通风管路基阴阳坡效应  

Adjustment of sunny-shady slope effect of duct-ventilated embankment with closed crushed-rock revetment

作　　者：张坤[1] 李东庆[1] 童刚强[1] 常法[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,兰州730000

出　　处：《沈阳工业大学学报》2011年第5期588-594,共7页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(40671039);国家高技术研究发展计划资助项目(2008AA11Z103);中国科学院西部行动计划(2期)资助项目(KZCX2-XB2-10);冻土工程国家重点实验室基金资助项目(SKLFSE-ZY-03)

摘　　要：为研究多年冻土区通风管路基和通风管-封闭碎石护坡路基在阴阳坡温度差异影响下,温度场的不对称特征和下部冻土上限间的差异,评价封闭块石护坡对通风管路基温度场的调节效果,利用北麓河通风管路基实测温度资料,并考虑气候变暖的影响,分别对这两种路基温度场进行数值模拟分析.分析结果表明,通风管路基具有一定的降温能力,但阴阳坡下冻土上限间差异显著,路基温度场呈现明显的不对称性;在通风管路基阳坡增加封闭块石护坡后,可以降低阳坡下土体温度,减小阴阳坡下冻土上限间差异,能有效调节路基阴阳坡效应.对第50年路基与天然地表交界处年平均热流密度的分析表明,增加封闭块石护坡后的路基结构优于通风管路基,且两种路基均处于吸热状态.In order to study the asymmetry characteristics of temperature field and the permafrost table differences beneath the embankment caused by the temperature difference between sunny and shady slopes for both duct-ventilated embankment and duct-ventilated embankment with closed crushed-rock revetment in permafrost region,and then to evaluate the adjusting effect of closed crushed-rock revetment on the temperature field of duct-ventilated embankment,the numerical simulation analysis of temperature fields for both duct-ventilated embankment and duct-ventilated embankment with closed crushed-rock revetment were carried out by using the measured temperature data of the duct-ventilated embankment in Beiluhe and with considering the climate warming effect.The analysis results show that the duct-ventilated embankment has a certain temperature decreasing ability,while the permafrost table between sunny and shady slopes has significant differences,and the temperature field of the embankment exhibits obvious asymmetry.When the closed crushed-rock revetment is added to the duct-ventilated embankment,the permafrost temperature beneath the sunny slope can be lowered,the permafrost table difference between sunny and shady slopes decrease,and the sunny-shady slope effect can be adjusted effectively.The analysis of the annual mean heat flux density at the interface of natural ground surface and embankment constructed for 50 years indicates that the structure of embankment with the addition of closed crushed-rock revetment is better than that of the conventional duct-ventilated embankment,and both embankments are in heat absorption states.

关 键 词：阴阳坡效应 通风管路基 封闭块石护坡 热流密度 温度场 多年冻土 冻土上限 数值分析 

分 类 号：TU445[建筑科学—岩土工程]