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冰川冻土 ›› 2020, Vol. 42 ›› Issue (4): 1256-1266.doi: 10.7522/j.issn.1000-0240.2018.1096

• 寒区工程与灾害 • 上一篇    下一篇

寒区高铁路桥过渡段冻结特征及热影响区域数值分析

刘华1(), 牛泽林1, 牛富俊2,3, 张楠4, 鲁洁1   

  1. 1.西安建筑科技大学 土木工程学院,陕西 西安 710055
    2.中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室,甘肃 兰州 730000
    3.中国科学院大学,北京 100049
    4.西安建筑科技大学 建筑学院,陕西 西安 710055
  • 收稿日期:2018-07-19 修回日期:2018-09-26 出版日期:2020-12-31 发布日期:2021-01-21
  • 作者简介:刘华(1983 - ), 男, 陕西延安人, 副教授, 2013年在中国科学院寒区旱区环境与工程研究所获博士学位, 从事寒区岩土工程研究. E-mail: liuhua029@xauat.edu.cn.
  • 基金资助:
    国家自然科学基金项目(51608436);中国科学院科技服务网络计划(STS计划)项目(KFJ-STS-ZDTP-037);陕西省自然科学基础研究计划项目(2018JQ5003)

Numerical analysis on freezing characteristics and thermal influence areas of roadbed-bridge transition section of high-speed railway in cold region

Hua LIU1(), Zelin NIU1, Fujun NIU2,3, Nan ZHANG4, Jie LU1   

  1. 1.School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China
    2.State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
    4.School of Architecture,Xi’an University of Architecture and Technology,Xi’an 710055,China
  • Received:2018-07-19 Revised:2018-09-26 Online:2020-12-31 Published:2021-01-21

摘要:

随着我国高速铁路网络逐步向寒区大范围延伸, 线路纵向上选用了较高比例的桥梁以跨越地形, 势必出现大量的路桥过渡段。路桥过渡段使线路纵向上出现了刚度变化以及桥用、 路用材料的工程抗冻性能差异, 进而引发不均匀的冻胀和融沉变形, 产生桥头跳车的可能, 降低行车的舒适度和安全性。文章运用土壤冻融条件下热传导理论的基本方程和数值方法, 结合哈大高铁的典型工况建立路桥过渡段模型, 计算分析其在春季融化期间的冻结特征差异和演变规律, 并基于工程优化设计了三种不同的台后填筑模式, 得到冻融条件下该气候分区的热影响范围, 并基于此分析了冻结圈面积、 周长、 长宽比和横向热扰动距离等几何指标。计算结果表明, 仅考虑热学影响时, 在有保温层和无锥台护坡工况下, 路桥过渡段的综合效果较好。

关键词: 寒区高铁, 路桥过渡段, 冻结特征, 填筑模式, 热影响区域

Abstract:

With the gradual development of high-speed railway in cold region, a large proportion of bridges were used to cross the complex terrain and roadbed-bridge transition sections were appeared. For the discontinuities changes of stiffness between bridge and roadbed, and the anti-frost properties difference of geomaterials, the uneven frost heave could be triggered and reduce the comfort and safety of the vehicle. In this paper, the equations of heat transfer about soil freezing and thawing were considered to analyze the freezing characteristics and changing process, with the parameters of model which derived from Harbin-Dalian high-speed railway. Then in the optimal design stage, three different models were analyzed for the four parameters of frozen area, perimeter, ratio of length and width, and transverse thermal disturbance distance. The results show that the model of insulation layer and non-cone slope provides a better effect for the roadbed-bridge transition section, as just considering thermal influence.

Key words: high-speed railway in cold region, roadbed-bridge transition section, freezing characteristics, filling mode, thermal influence areas

中图分类号: 

  • U213.1