多年冻土地区的公路路基温度场研究
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摘要
以青藏公路为研究对象,采用数值计算方法模拟其多年冻土区路基温度场,对冻土路基温度场的影响因素及其分布进行了分析。最终得出以下结果,路基温度场数值模拟表明,自然上限在第一年为1. 81 m,相对于低路基而言,此时高路基形成冻结核,路基内形成融化楹,随后开始冻结天然地表,边坡和路面的地温高于天然地表,会出现滞后现象。人为上限受边坡影响较小,在寒区道路工程中,边坡坡度不是影响路基热稳定性的主要因素。当修筑完成保温护道后,将会进一步增强天然地表受热面,如果天然地表的温度低于保温护道表面年均温度时,就会增大年平均地温差值。在深度相同时,阳坡土体温度大于阴坡,在路基横断面,冻结线为倾斜的非对称分布。
Taking Qinghai-Tibet Highway as the research object,this paper simulates the Subgrade Temperature Field in permafrost region by numerical calculation method, and analyses the influencing factors and distribution of the Subgrade Temperature Field in permafrost region. The results show that the natural upper limit is 1. 81 M in the first year. Compared with the low subgrade,the frozen core is formed in the high subgrade,and the melted tenon is formed in the subgrade. At this time,the natural surface is also frozen. Compared with the natural surface,the ground temperature of the slope and the pavement is relatively high,and there will be a lag. Phenomenon. The artificial upper limit is less affected by the slope. Slope gradient is not the main factor affecting the thermal stability of Subgrade in road engineering in cold region. After the construction of the thermal insulation pavement,the original natural surface heating surface is further increased, and the annual average ground temperature difference will increase when the surface temperature of the thermal insulation pavement is higher than that of the natural surface. At the same depth,the soil temperature on the sunny slope is higher than that on the shady slope,and the frozen line is inclined asymmetrical distribution in the cross section of the roadbed.
Taking Qinghai-Tibet Highway as the research object,this paper simulates the Subgrade Temperature Field in permafrost region by numerical calculation method, and analyses the influencing factors and distribution of the Subgrade Temperature Field in permafrost region. The results show that the natural upper limit is 1. 81 M in the first year. Compared with the low subgrade,the frozen core is formed in the high subgrade,and the melted tenon is formed in the subgrade. At this time,the natural surface is also frozen. Compared with the natural surface,the ground temperature of the slope and the pavement is relatively high,and there will be a lag. Phenomenon. The artificial upper limit is less affected by the slope. Slope gradient is not the main factor affecting the thermal stability of Subgrade in road engineering in cold region. After the construction of the thermal insulation pavement,the original natural surface heating surface is further increased, and the annual average ground temperature difference will increase when the surface temperature of the thermal insulation pavement is higher than that of the natural surface. At the same depth,the soil temperature on the sunny slope is higher than that on the shady slope,and the frozen line is inclined asymmetrical distribution in the cross section of the roadbed.
引文
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[10]郑宪,李明宝,阎梦晴,等.季节性冰冻地区公路路基冻胀融沉过程规律研究[J].科学技术与工程,2016,16(3):239-244.
[2]何彬彬.基于强度折减法的多年冻土路基稳定性分析[D].兰州:兰州理工大学,2016.
[3]王天亮,岳祖润.细粒含量对粗粒土冻胀特性影响的试验研究[J].岩土力学,2013,34(2):359-364.
[4]Ma W,Mu Y H,Wu Q B,et al.Characteristics and mechanisms of emban km ent deformation along the Qinghai-Tibet Railway in permafrost regions[J].Cold Regions Science and Technology,2011,67(3):178-186.
[5]朱凤杰.高山多年冻土地区路基冻胀融沉机理及稳定性评价[D].西安:长安大学,2017.
[6]王晨星,刘远才,刘德稳.基于土体冻结理论在地铁施工中的应用[J].森林工程,2018,34(2):89-94.
[7]Jun L T,Xiao H Z,Yan K Y,et al.The heaving perforance of the graded crushed stone at cold region[J].Advanced Materials Research,2014(831):78-82.
[8]王英才.青藏高原高速公路宽幅路基温度场有限元分析[D].北京:北京交通大学,2013.
[9]GuoT Y,Hong Y Y,De G C,et al.Experimental study on frost heave of high-speed railway subgrade in the seasonally frozen region[J].Japanese Geotechnical Society Special Publication,2016,l2(48):1699-1702.
[10]郑宪,李明宝,阎梦晴,等.季节性冰冻地区公路路基冻胀融沉过程规律研究[J].科学技术与工程,2016,16(3):239-244.