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Geomechanics and Engineering
  Volume 10, Number 2, February 2016, pages 225-245
DOI: https://doi.org/10.12989/gae.2016.10.2.225
 


A novel modeling of settlement of foundations in permafrost regions
Songhe Wang, Jilin Qi, Fan Yu and Fengyin Liu

 
Abstract
    Settlement of foundations in permafrost regions primarily results from three physical and mechanical processes such as thaw consolidation of permafrost layer, creep of warm frozen soils and the additional deformation of seasonal active layer induced by freeze-thaw cycling. This paper firstly establishes theoretical models for the three sources of settlement including a statistical damage model for soils which experience cyclic freeze-thaw, a large strain thaw consolidation theory incorporating a modified Richards' equation and a Drucker-Prager yield criterion, as well as a simple rheological element based creep model for frozen soils. A novel numerical method was proposed for live computation of thaw consolidation, creep and freeze-thaw cycling in corresponding domains which vary with heat budget in frozen ground. It was then numerically implemented in the FISH language on the FLAC platform and verified by freeze-thaw tests on sandy clay. Results indicate that the calculated results agree well with the measured data. Finally a model test carried out on a half embankment in laboratory was modeled.
 
Key Words
    settlement; frozen ground; freeze-thaw; thaw consolidation; creep
 
Address
(1) Songhe Wang, Fengyin Liu:
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an Shaanxi, 710048, China;
(2) Jilin Qi:
College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
(3) Fan Yu:
State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China.
 

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