摘要
为掌握中国华北地区铁路路基冻害机理,在准池铁路K45+010建立路基监测断面,监测并分析华北地区路基温度场、冻结深度和冻胀量的变化规律,探究其与大气环境、地下水的关系;提出路基温度估算式,计算分析中国华北地区路基冻害发育特性,并与东北、西北地区进行对比。结果表明:准池铁路冻结期持续约141 d,最低气温达-24.7℃,冻结深度增大速度为1.11~2.89 cm·d^(-1),路肩冻结深度最大为197 cm,轨道冻胀量最大为9.4 mm;华北地区铁路冻结期轨道变形分为初始波动、快速冻胀、稳定冻胀、冻融循环和融化回落5个阶段,快速冻胀和融化回落阶段历时均为15~20 d,为线路维护的重难阶段;东北、西北和华北地区路基冻害发育特性存在显著差异,东北地区多属温带季风气候,降水量大,冻胀量最大;西北地区多属大陆性气候,路基冻胀持续时间最长,冻结深度最大,主要发育深层冻胀;华北地区纬度相对较低,冻结期最短,表现为先发育深层冻胀、后在降雪融水入渗时发育浅层冻胀的规律,冬季降水容易融化入渗加剧冻害。华北和东北地区冻胀防控应优先以水分为对象,西北地区优先以温度为对象。
To elucidate the mechanism of frost damage to railway subgrade in north China,this paper established a subgrade monitoring cross-section at the mileage of K45+010 of the Jungar-Shenchi Railway.The research systematically monitored and analysed the laws of the subgrade temperature field,frost depth,and frost heave in North China,with the intent to uncover their relationships with atmospheric conditions and groundwater.A predictive formula for subgrade temperature was proposed and the characteristics of frost damage development in the subgrades of North China were computationally analysed.The results were compared with those of Northeast and Northwest China.The findings revealed that the freezing period for the Jungar-Shenchi Railway lasted approximately 141 days,with the lowest temperature reaching-24.7 ℃.The rate of increase in frost depth was between 1.11 to 2.89 cm · d-1,with the maximum frost depth at the shoulder reaching 197 cm and the maximum frost heave 9.4 mm.The railway deformation in North China during the freezing period could be categorised into five distinct phases:the initial fluctuation,the rapid frost heave,the stable frost heave,the freeze-thaw cycle,and the thaw receding,with the rapid frost heave and the thaw receding phases lasting for 15to 20 days each,representing crucial and challenging periods for line maintenance.Remarkable discrepancies were observed in the characteristics of frost damage development in the subgrades across the Northeast,Northwest,and North China regions.The Northeast region,predominantly under the temperate monsoon climate with significant precipitation,exhibited the most significant frost heave.In contrast,the Northwest region,primarily characterised by a continental climate,showed the longest frost heave duration and the deepest frost penetration,mainly manifesting deep frost heave.The North China region,having a relatively lower latitude and thus a shorter freezing period,demonstrated a pattern of initial deep frost penetration followed by shallow frost heave deve
作者
胡田飞
刘济华
张宗凯
岳祖润
李天峰
杨志浩
HU Tianfei;LIU Jihua;ZHANG Zongkai;YUE Zurun;LI Tianfeng;YANG Zhihao(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Key Laboratory of Mechanical Behavior Evolution and Control of Traffic Engineering Structures in Hebei,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2023年第4期40-53,共14页
China Railway Science
基金
国家自然科学基金资助项目(42001059,52172347,52178340)
中央引导地方科技发展资金资助项目(226Z5402G)
河北省博士后择优资助重点项目(B2022005006)。
关键词
铁路路基
准池铁路
冻胀监测
温度场
冻结深度
Railway subgrade
Jungar-Shenchi Railway
Frost heave monitoring
Temperature field
Frost depth
