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A simplified numerical method to simulate the thawing of frozen soil
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering ( IF 2.2 ) Pub Date : 2020-08-20 , DOI: 10.1680/jgeen.18.00239
Marianna Loli 1 , Angelos Tsatsis 2 , Rallis Kourkoulis 2 , Ioannis Anastasopoulos 3
Affiliation  

Thawing weakens the frozen soil supporting buildings and lifelines from Siberia to Alaska, resulting in settlements up to hundreds of millimetres during a single season. This paper presents a simplified sequentially coupled numerical approach that can be implemented in a general purpose, commercially available finite-element analysis model. It is intended to provide a reasonably accurate computational tool for the analysis of structures on degrading permafrost, allowing modelling of complex three-dimensional geometries and boundary and loading conditions. The method permits simulation of the temperature-dependent thermal and mechanical properties of soils in an approximate manner. It accommodates large-strain consolidation theory, also allowing use of plasticity constitutive relationships. A thorough validation study was carried out involving comparison with monotonic and cyclic thaw consolidation element tests, analytical solutions and a well-documented case study of an unstable roadway embankment. The latter was complemented by an investigation of thaw-settlement remediation solutions using thermosyphons, with emphasis on the three-dimensional response and their transverse spacing.

中文翻译:

模拟冻土融化的简化数值方法

解冻削弱了从西伯利亚到阿拉斯加的支撑建筑物和生命线的冻土,导致单个季节的沉降高达数百毫米。本文提出了一种简化的顺序耦合数值方法,可以在通用的市售有限元分析模型中实施。它旨在为分析永久冻土上的结构提供合理准确的计算工具,从而可以对复杂的三维几何形状以及边界和载荷条件进行建模。该方法允许以近似方式模拟与温度相关的土壤的热和机械性能。它适用于大应变固结理论,也允许使用可塑性本构关系。进行了彻底的验证研究,包括与单调和循环融化固结元素测试,分析解决方案以及不稳定道路路堤的有据可查的案例研究进行比较。后者的补充是对使用热虹吸管的解冻沉降解决方案的研究,重点是三维响应及其横向间距。
更新日期:2020-08-20
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