孙志忠, 张明义, 李双洋, 武贵龙, 郑剑锋. 2015: 青藏铁路多年冻土区路基下的融化夹层. 工程地质学报, 23(s1): 31-37. DOI: 10.13544/j.cnki.jeg.2015.s1.005
    引用本文: 孙志忠, 张明义, 李双洋, 武贵龙, 郑剑锋. 2015: 青藏铁路多年冻土区路基下的融化夹层. 工程地质学报, 23(s1): 31-37. DOI: 10.13544/j.cnki.jeg.2015.s1.005
    SUN Zhizhong, ZHANG Mingyi, LI Shuangyang, WU Guilong, ZHENG Jianfeng. 2015: CHARACTERISTICS OF THAWED INTERLAYER BENEATH EMBANKMENT OF THE QINGHAI-TIBET RAILWAY IN PERMAFROST REGIONS. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 31-37. DOI: 10.13544/j.cnki.jeg.2015.s1.005
    Citation: SUN Zhizhong, ZHANG Mingyi, LI Shuangyang, WU Guilong, ZHENG Jianfeng. 2015: CHARACTERISTICS OF THAWED INTERLAYER BENEATH EMBANKMENT OF THE QINGHAI-TIBET RAILWAY IN PERMAFROST REGIONS. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 31-37. DOI: 10.13544/j.cnki.jeg.2015.s1.005

    青藏铁路多年冻土区路基下的融化夹层

    CHARACTERISTICS OF THAWED INTERLAYER BENEATH EMBANKMENT OF THE QINGHAI-TIBET RAILWAY IN PERMAFROST REGIONS

    • 摘要: 基于青藏铁路路基变形与地温观测数据, 研究了多年冻土区路基下融化夹层特征及其对路基沉降变形的影响。结果表明:在已有监测场地中, 青藏铁路沿线天然场地融化夹层发育较少, 而路基下融化夹层发育较多, 低温冻土区路基下融化夹层能够逐渐完全回冻使其消失, 高温冻土区大部分路基下融化夹层有进一步发展的趋势。高温冻土区路基下融化夹层厚度的增加主要是由多年冻土人为上限的下降引起的。当融化夹层下部为高含冰量冻土时, 融化夹层与路基沉降变形关系密切, 路基易产生较大的沉降变形。当融化夹层下部为低含冰量冻土时, 路基沉降变形较小。

       

      Abstract: Based on the data of ground temperature and deformation beneath embankment of the Qinghai-Tibet Railway in permafrost regions during the year 2006 to 2013, characteristics of thawed interlayer beneath the embankment and its effect on the embankment settlement deformation are studied. The results indicate that there is little thawed interlayer developed beneath natural field along the Qinghai-Tibet Railway, while beneath the embankment the thawed interlayer is developed widely, and it can be refrozen totally in the regions of lower mean annual ground temperature and developed further in the regions of higher mean annual ground temperature. The increasement of thickness of thawed interlayer in warm permafrost regions was duo to the decreasing of artificially permafrost table. Thawed interlayer is closely related to the embankment settlement deformation. The ice content of permafrost under the thawed interlayer controls the settlement deformation of embankment, the higher the ice content is, the bigger the settlement deformation is.

       

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