img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2014, Vol. 36 ›› Issue (4): 790-801.doi: 10.7522/j.issn.1000-0240.2014.0095

• 冻土与气候、人类活动、环境及其他问题的相互作用 • 上一篇    下一篇

214国道沿线的多年冻土及其工程地质条件评价

陈继1, 冯子亮1, 盛煜1, 曹元兵1, 房建宏2   

  1. 1. 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;
    2. 青海省交通科学研究院, 青海 西宁 810001
  • 收稿日期:2014-03-11 修回日期:2014-06-17 出版日期:2014-08-25 发布日期:2014-08-23
  • 作者简介:陈继(1977-),男,河南永城人,副研究员,2007年在中国科学院寒区旱区环境与工程研究所获博士学位,现主要从事寒区工程与环境方面的研究工作.E-mail:chenji@lzb.ac.cn
  • 基金资助:
    中国科学院“西部之光”项目(29Y229D01);国家自然科学基金项目(41101065)资助

Permafrost along National Highway 214 and its engineering geological condition evaluation

CHEN Ji1, FENG Ziliang1, SHENG Yu1, CAO Yuanbing1, FANG Jianhong2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Qinghai Research Institute of Transportation, Xining 810001, China
  • Received:2014-03-11 Revised:2014-06-17 Online:2014-08-25 Published:2014-08-23

摘要: 214国道位于青藏高原的东缘,1985-2012年期间的冻土勘察和地温监测资料表明,在河卡山至清水河439 km范围内的高山、滩地和沼泽化草甸地区分布着不连续和岛状多年冻土,公路实际穿越的多年冻土段累计里程约232.4 km,沿线绝大部分路段的地温高于-1.5℃,含冰量、冻土上限等多年冻土特征指标随地形、地貌变化剧烈. 在分析上述资料的基础上,从冻土热稳定性和自然环境两个因素入手,采用突变级数法建立了多年冻土工程地质条件评价模型并对214国道多年冻土工程地质条件进行了定量评价. 结果表明:214国道沿线冻土热稳定性普遍较差,自然环境多处于一般状态. 除局部少冰、多冰冻土路段以外,沿线多年冻土工程地质条件总体处于较差或恶劣状态. 与214国道病害调查资料进行比较后发现,路基病害一般发生在工程地质条件差的路段. 这表明该评价结果比较准确的反映了沿线的多年冻土工程地质条件,对于现有214国道和新建共和-玉树高速公路的运营和维护具有重要的指导意义.

关键词: 214国道, 多年冻土, 突变级数法, 工程地质条件

Abstract: National Highway 214 goes through the eastern part of the Tibetan Plateau. Investigation from 1985 to 2012 revealed that there were 439 km of the highway running between the Hekashan Mountain and the Qingshuihe village, including 232.4 km in permafrost regions, where the mean annual ground temperature was generally over -1.5℃, ice content and permafrost table varied significantly with terrain and landform. Based on the permafrost investigation, engineering geological model for evaluating permafrost conditions is established by using the catastrophe progression method, which considered the thermal stability of permafrost and ambient environment. Evaluation based on the model shows that the thermal stability of permafrost is poor and environment is in a normal state. Excluding some ice-poor section, geological conditions along the highway are in the bad and even worse state. It is found that the roadbed problems mainly occur in bad and worse geological conditions. The evaluation can effectively guide the operation and maintenance of National Highway 214 and the construction of Gonghe-Yushu Expressway.

Key words: National Highway 214, permafrost, catastrophe progression method, engineering geological conditions

中图分类号: 

  • P642.14