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冰川冻土  2014 

214国道沿线的多年冻土及其工程地质条件评价

DOI: 10.7522/j.issn.1000-0240.2014.0095, PP. 790-801

Keywords: 214国道,多年冻土,突变级数法,工程地质条件

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Abstract:

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439km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232.4km,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.

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