Pre-evaluation on stability of proposed expressway embankment with existing geothermal regulation measures in permafrost regions

多年冻土区现有地温调控措施作用下高速公路路基稳定性预评价

Abstract

Embankment stability is the primary problem for the expressway construction in permafrost regions. The proposed Qinghai-Tibet Expressway (QTE) is planned to construct along the Qinghai-Tibet Project Corridor. Confronted with harsh environmental condition and intense heat exchange between earth and atmosphere, it is necessary to predict and evaluate the stability of the proposed QTE. In this study, the factors affecting the embankment stability are analyzed firstly. And then, a scheme for the stability evaluation of the embankment is established. Finally, the evaluation scheme is used for the pre-evaluation of the stability for the proposed QTE with different geothermal regulation measures (GRMs). The results indicate that the influencing factors include climatic environment, permafrost property, engineering condition and geological condition, and among them, engineering condition and permafrost property are the main influence factors for embankment stability. The stability of the proposed QTE varies greatly in the different geomorphological regions. The application effect and contribution to embankment stability of the existing GRMs are different, and using GRMs cannot completely overcome the influence of various factors on expressway stability. In the construction process, different GRMs should be adopted depending on the geomorphological environment where the embankment is located to ensure the embankment stability.

摘要

多年冻土区高速公路建设的主要问题是路基的稳定性。面对恶劣的环境条件和地表与大气之间 强烈的热交换, 有必要对多年冻土区拟建青藏高速公路的稳定性进行预测和评价。首先, 分析影响路 基稳定性的因素。然后, 在此基础上建立路基稳定性评价方案。最后, 利用该评价方案对不同地热调 节措施条件下拟建青藏高速公路的稳定性进行预评价。结果表明, 影响因素包括气候环境、冻土性质、 工程条件和地质条件, 其中工程条件和冻土性质是影响路基稳定的主要因素。在不同的地貌区域, 拟 建青藏高速公路的稳定性差异很大。现有地温调控措施的应用效果和对路基稳定性的贡献不同, 采用 地温调控措施不能完全克服各种因素对高速公路稳定性的影响, 应根据路基所处的地貌环境采用不同 的地温调控措施, 以保证路基的稳定。

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Affiliations

Authors

Contributions

LUO Xiao-xiao established the models, predicted the stability and wrote the first draft of manuscript. MA Qin-guo provided the ideas and edited the draft of the manuscript. JIANG Hai-qiang analyzed the calculated results.

Corresponding author

Correspondence to Qin-guo Ma.

Additional information

Conflict of interest

LUO Xiao-xiao, MA Qin-guo, and JIANG Hai-qiang declare that they have no conflict of interest.

Foundation item

Project(2019QZKK0905) supported by the Second Tibetan Plateau Scientific Expedition and Research (STEP) Program, China; Project(41901074) supported by the National Natural Science Foundation of China; Project(2020A1515010745) supported by the Natural Science Foundation of Guangdong Province, China; Project(SKLFSE201810) supported by the Open Fund of the State Key Laboratory of Frozen Soil Engineering, China; Project(2019MS119) supported by the Fundamental Research Funds for the Central Universities, China

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Luo, Xx., Ma, Qg. & Jiang, Hq. Pre-evaluation on stability of proposed expressway embankment with existing geothermal regulation measures in permafrost regions. J. Cent. South Univ. 28, 264–283 (2021). https://doi.org/10.1007/s11771-021-4601-5

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Key words

  • permafrost
  • expressway embankment
  • influencing factor
  • stability evaluation
  • geothermal regulation measures

关键词

  • 多年冻土
  • 高速公路路基
  • 影响因素
  • 稳定性评价
  • 地温调控措施