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冰川冻土 ›› 2001, Vol. 23 ›› Issue (3): 318-311.

• 研究论文 • 上一篇    下一篇

黑北公路冻土路基设计原则及病害特征

孟凡松1, 刘建平1, 刘永智2   

  1. 1. 黑龙江省高速公路建设局, 黑龙江, 哈尔滨, 150036;
    2. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃, 兰州, 730000
  • 收稿日期:2001-01-13 修回日期:2001-02-10 出版日期:2001-08-25 发布日期:2012-04-26

Design Principles and Frost Damage Characteristics of Frozen Soil Roadbed along the Heihe-Bei’an Highway

MENG Fan-song1, LIU Jian-ping1, LIU Yong-zhi 2   

  1. 1. Expressway Construction Bureau of Heilongjiang Province, Harbin Heilongjiang 150036, China;
    2. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China
  • Received:2001-01-13 Revised:2001-02-10 Online:2001-08-25 Published:2012-04-26

摘要: 依据位于小兴安岭地区的黑北公路沿线退化多年冻土特征,以及地质、水文、气候等工程环境条件,分析了黑北公路路基可能会发生的病害和发展过程,提出了适合于黑北公路的路基设计与病害防治措施,以便比选与优化退化型多年冻土地区的路基稳定性设计原则及结构形式.同时,在路基设计形式和病害处理上提出了一些初步设想和建议.

关键词: 退化型多年冻土, 路基设计, 病害特征

Abstract: The Heihe-Beian Highway is located in sporadic permafrost regions, where 17 sections of permafrost, 3.165 km in length, appear. The mean annual ground temperature is high and the thermal stability is poor. Sporadic permafrost presents in swale swampy wetland with peat and surface water. Permafrost distribution and development has an obviously difference in different topographic units under the effect of conversing-temperature, vegetation, soil, aspect, surface water and ground water. Generally, permafrost mainly appears in ditch valley. No permafrost appears in high slopes and mountains. Seasonally frozen and thawed depth is about 1.5 to 2.0 m, with the maximum up to 2.5 m. Thickness of permafrost is about 3 to 6 m, with the maximum about 9 m. Ground ice takes place in massive, micro-layered, layered cryostructures near the permafrost table. Problems of frost heaving and thaw settlement, i.e., frost heaving in seasonal frozen areas and thaw settlement in permafrost areas, always occur. Frost heaving is extremely strong in swampy sections, strong in slope sections, and slight in hill sections. Permafrost conditions, its type and ground ice should be considered in the design principles of roadbed in order to ensure stability and reliability of roadbed in the regions of sporadic permafrost. Maintaining original design principle can ensure stable of a road with icy soil, because icy soil thawing is unable to result in settlement. Prethawing design principle may be applied to ice-rich and saturated-ice soil, but monitoring the roadbed deformation is necessary. Temporary road surface is used for saturated-ice soil and ice with soil, because the permafrost is too thick for thawing during the construction. It is possible to use a temporary road surface, and then add a concrete pavement after the permafrost under the roadbed thawing. Protecting principle may apply in thick and cold permafrost, because the permafrost cannot be thawed chronically. Cold permafrost must be protected to ensure roadbed stable.

Key words: degrading permafrost, roadbed design, frost damage characteristics

中图分类号: 

  • U416.1+68