复合热边界下多年冻土路基温度场研究  

Temperature Field Study for Permafrost Subgrade with Compound Thermal Boundaries

作　　者：姜云花 李高升 赵林晔 赵宇琴 段少龙 张伟东 JIANG Yunhua;LI Gaosheng;ZHAO Linye;ZHAO Yuqin;DUAN Shaolong;ZHANG Weidong(Institute of Trans portation,Inner Mongolia University,Hohhot 010070,China;Inmer Mongolia Highway Traffic Investment Development Co.,LTD,Hohhot 010010,China;Inner Mongolian Transportation Design&Research Institute Co.,LTD,Hohhot 010010,China)

机构地区：[1]内蒙古大学交通学院,呼和浩特010070 [2]内蒙古公路交通投资发展有限公司,呼和浩特010010 [3]内蒙古交通设计研究院有限责任公司,呼和浩特010010

出　　处：《内蒙古大学学报（自然科学版）》2020年第6期649-657,共9页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金(51879131,41901070);冻土工程国家重点实验室开放课题基金(SKLFSE201805)资助。

摘　　要：多年冻土区路基温度分布和变化规律是寒区道路工程设计、建设及冻害治理的重要内容。本文以青藏高原某处典型公路路段为研究对象,分别运用第一类边界条件和第二、三类边界条件叠加组合对含相变的冻土路基温度场进行了数值计算,并分析了路基温度场的变化规律以及不同路面类型对路基温度场的影响。计算分析结果表明:多年冻土区路基温度场的特点表现为单向融化和双向冻结;受全球变暖的影响,路基自建成之日起,运营30年,路基内部平均温度提升1.3℃左右,天然地表以下3m模型计算范围内的的土体平均温度提升0.9℃左右;在年均气温温度-5.2℃,运营10年,天然地表、水泥路面、沥青路面下最大融化深度分别为1.7、1.8、2.5m,而且水泥路面可有效的降低路面温度,降低对下伏多年冻土的影响,增加路基的稳定性。The distribution and variation of subgrade temperature in permafrost regions are an important part of road engineering design,construction and frost damage control.In this paper,taking a typical highway section in the Qinghai Tibet Plateau as the research object,the temperature field of permafrost subgrade with phase change is calculated by using the first boundary condition and the superposition combination of the second and the third boundary conditions.At the same time,the change rule of subgrade temperature field and the influence of different pavement types on subgrade temperature field are analyzed.The calculation and analysis results show that the temperature field of roadbed in permafrost region has the characteristics of double direction freezing and one direction thawing.And it is found that due to the influence of global warming,the average temperature inside the subgrade will increase by about 1.3℃and the average temperature of the soil within the calculation range of the model of 3.0 m below the natural surface will increase by about 0.9℃in 30 years of operation after the subgrade completion.In addition,after 10 years of operation at an average annual temperature of-5.2℃,the maximum thawing depth of natural surface,cement pavement and asphalt pavement is 1.7,1.8 and 2.5 m respectively,and it is also found that cement pavement can effectively reduce the temperature of pavement and impact underlying permafrost,so it can increase the subgrade stability.

关 键 词：多年冻土 路基 温度场 路面类型 

分 类 号：TU471.7[建筑科学—结构工程]