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首页> 外文期刊>Cold regions science and technology >Impacts of supra-permafrost water ponding and drainage on a railway embankment in continuous permafrost zone, the interior of the Qinghai-Tibet Plateau
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Impacts of supra-permafrost water ponding and drainage on a railway embankment in continuous permafrost zone, the interior of the Qinghai-Tibet Plateau

机译：多年冻土积水和排水对青藏高原内部多年冻土区铁路路堤的影响

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摘要

In a permafrost environment, supra-permafrost water is an important local factor affecting the shallow ground thermal regime and also plays a significant role in geotechnical problems. In this study, the impacts of suprapermafrost water ponding and drainage on the thermal regime and settlement characteristics of a railway embankment in continuous permafrost zone, the interior of the Qinghai-Tibet Plateau were investigated using 13year records (2003-2016) of field measured data. Results showed that, because of the great latent heat of the ponded water alongside the embankment, a zero curtain layer (ZCL) as much as 5.5 m thick developed in and beneath the embankment after embankment construction in 2003. A three-layered thermal regime developed in the embankment and the subgrade. Although crushed rock revetments were installed 5 years after embankment construction, no soil cooling occurred beneath the ZCL and the ZCL remained stable in thickness. Meanwhile, embankment settlement developed quickly and nearly linearly from 2003 to 2012, with a cumulative settlement approaching approximately 160 mm at both the sunny and the shady embankment shoulders. Compression and creep of warm and ice-rich permafrost layer (WIPL) beneath the ZCL are considered as the main contributors to this significant settlement. Following drainage of the ponded water during 2012, the ZCL cooled quickly and completely frozen after two cold seasons. The underlying permafrost table moved upwards into the embankment and the WIPL cooled with time. Embankment settlement also slowed significantly. However, an asymmetrical temperature field developed in the embankment and the subgrade because of the sunny-shady embankment slope effect, leading to differential settlement between the sunny and the shady embankment shoulders.
机译：在多年冻土环境中，超多年冻土水是影响浅层地热状况的重要局部因素，并且在岩土工程问题中也起着重要作用。本研究利用13年的实测数据（2003-2016），研究了多年冻土积水和排水对连续冻土区，青藏高原内部铁路路堤的热力状态和沉降特征的影响。 。结果表明，由于路堤旁积水的潜热很大，2003年路堤施工后，路堤内部和下方形成了厚度最大为5.5 m的零帘层（ZCL）。形成了三层热态在路堤和路基中。尽管在堤防施工后5年安装了碎石护岸，但ZCL下方未发生土壤冷却，ZCL的厚度保持稳定。同时，从2003年到2012年，路堤沉降快速且几乎呈线性发展，在晴天路堤和阴暗路堤路肩处，累计沉降量接近160毫米。 ZCL下温暖和富含冰层的永久冻土层（WIPL）的压缩和蠕变被认为是造成这一重大沉降的主要因素。在2012年排空所积蓄的水后，ZCL迅速冷却并在两个寒冷季节后完全冻结。下方的多年冻土表向上移动到路堤中，WIPL随着时间的流逝而冷却。路堤沉降也显着放缓。然而，由于日光阴暗的路堤边坡效应，路堤和路基中形成了一个不对称的温度场，导致了日光阴暗路肩的沉降差异。

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  • 来源
    《Cold regions science and technology》 |2018年第10期|23-31|共9页
  • 作者

    Mu Yanhu; Ma Wei; Li Guoyu; Niu Fujun; Liu Yongzhi; Mao Yuncheng;

  • 作者单位

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Supra-permafrost water; Water ponding; Drainage; Railway embankment; Thermal regime; Embankment settlement;

    机译：多年冻土;集水;排水;铁路路堤;热力;路堤沉降;

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