岛状冻土路基年周期性地温场数值模拟分析
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摘要
多年岛状冻土区公路工程的主要问题是由于永冻土的不断退化,导致公路路基产生较大的不均匀变形,从而引发热融沉、路基纵裂及冻胀变形等严重的路基病害,掌握该类路基地温场的活动规律是解决其热稳定性问题的前提条件。因此,本文以实际工程为依托,采用有限元数值模拟方法,对其工后1 a内的路基地温场进行瞬态模拟分析,并与实测数据进行对比验证,从而提出了高纬度地区多年岛状冻土路基的年周期性的地温变化过程可分为冻结、过渡和融化3个阶段,并根据数值模拟结果,揭示了各阶段路基内地温分布特征、影响因素及变化规律。
The main highway engineering problem is the larger inhomogeneous deformation of subgrade in patchy permafrost areas,which caused by the permafrost degradation,and then it bringed about a series of serious subgrade diseases such as thawing settlement,subgrade longitudinal cracking and rost heaving deformation,so mastering mechanics laws of ground temperature field is the precondition of enhancing thermostability for this subgrade. Therefore,based on practical project,this paper simulated and analyzed the transient process of the ground temperature field by finite element numerical simulation during one year after the project was done,and through comparing with measured datas,the study results shows that the annual cyclical activity process of ground temperature can be divided into three stages: freezing period,transition period and thawing period,and based on the numerical simulation results,it presented the distribution characteristics of ground temperature,the influence factors and the change rules of patchy permafrost subgrade for each period.
The main highway engineering problem is the larger inhomogeneous deformation of subgrade in patchy permafrost areas,which caused by the permafrost degradation,and then it bringed about a series of serious subgrade diseases such as thawing settlement,subgrade longitudinal cracking and rost heaving deformation,so mastering mechanics laws of ground temperature field is the precondition of enhancing thermostability for this subgrade. Therefore,based on practical project,this paper simulated and analyzed the transient process of the ground temperature field by finite element numerical simulation during one year after the project was done,and through comparing with measured datas,the study results shows that the annual cyclical activity process of ground temperature can be divided into three stages: freezing period,transition period and thawing period,and based on the numerical simulation results,it presented the distribution characteristics of ground temperature,the influence factors and the change rules of patchy permafrost subgrade for each period.
引文
[1]王涛,周国庆,等.寒区冻土工程随机热力分析[M].北京:科学出版社,2017:2~4.
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[3] Batenipour Hamid,Alfaro Marolo,Kurz David,Graham Jim. Deformations and ground temperatures at a road em-ban km ent in northern Canada[J]. Canadian Geotechnical Journal,2014,51(3):260~271.
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[5] M Ye,Y Hufangfu,X Mao. Freeze depth predicting of permafrost subgrade based on moisture and thermal coupling model[J]. Ksce Journal of Civil Engineering,2015,19(6):1707~1715.
[6]张锋,林波,冯德成,等.季节冻土区长期交通荷载下公路路基永久变形特性[J].哈尔滨工业大学学报,2017,49(3):120~126.
[7]赵林,盛煜.多年冻土调查手册[M].北京:科学出版社,2015:52~54.
[8]邰博文,刘建坤,房建宏,等.高温冻土区高速公路特殊结构路基地温分布特征及降温效果分析[J].岩石力学与工程学报,2017(A1):3696~3704.
[9]程培峰,王锐,韩春鹏.高纬度多年冻土区路基工后温度变化规律研究[J].公路工程,2017(5):12~17.
[10] A Hacine-Gharbi,P Ravier. A binning formula of bi-histogram for joint entropy estimation using mean square error minimization[J]. Pattern Recognition Letters,2018,101(1):21~28.
[2]常艳婷,陈忠达,张震,等.青藏公路典型路基病害影响因素分析[J].中外公路,2016(1):19~22.
[3] Batenipour Hamid,Alfaro Marolo,Kurz David,Graham Jim. Deformations and ground temperatures at a road em-ban km ent in northern Canada[J]. Canadian Geotechnical Journal,2014,51(3):260~271.
[4]孙全胜,常继峰.基于支持向量机的多年冻土路基融沉变形预测[J].公路工程,2014,39(5):136~140.
[5] M Ye,Y Hufangfu,X Mao. Freeze depth predicting of permafrost subgrade based on moisture and thermal coupling model[J]. Ksce Journal of Civil Engineering,2015,19(6):1707~1715.
[6]张锋,林波,冯德成,等.季节冻土区长期交通荷载下公路路基永久变形特性[J].哈尔滨工业大学学报,2017,49(3):120~126.
[7]赵林,盛煜.多年冻土调查手册[M].北京:科学出版社,2015:52~54.
[8]邰博文,刘建坤,房建宏,等.高温冻土区高速公路特殊结构路基地温分布特征及降温效果分析[J].岩石力学与工程学报,2017(A1):3696~3704.
[9]程培峰,王锐,韩春鹏.高纬度多年冻土区路基工后温度变化规律研究[J].公路工程,2017(5):12~17.
[10] A Hacine-Gharbi,P Ravier. A binning formula of bi-histogram for joint entropy estimation using mean square error minimization[J]. Pattern Recognition Letters,2018,101(1):21~28.