Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (6): 645-653.doi: 10.3724/SP.J.1226.2015.00645

• ARTICLES •    

Analysis of permanent deformations of railway embankments under repeated vehicle loadings in permafrost regions

Wei Ma, Tuo Chen   

  1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou, Gansu 730000, China
  • Received:2015-03-16 Revised:2014-06-12 Published:2018-11-23
  • Contact: Wei Ma
  • Supported by:
    This work was supported by the National Key Basic Research Program of China (973 Program) (No. 2012CB026106), the Program for the Innovative Research Group of the National Natural Science Foundation of China (No. 41121061), and the Project for Excellence, State Key Laboratory of the National Natural Science Foundation of China (No. 41023003).

Abstract: By large-scale dynamic tests carried out on a traditional sand-gravel embankment at the Beilu River section along the Qinghai-Tibet Railroad, we collected the acceleration waveforms close to the railway tracks when trains passed. The dynamic train loading was converted into an equivalent creep stress, using an equivalent static force method. Also, the creep equation of frozen soil was introduced according to the results of frozen soil rheological triaxial tests. A coupled creep model based on a time-hardening power function rule and the Druker-Prager yield and failure criterion was established to analyze the creep effects of a plain fill embankment under repeated train loads. The temperature field of the embankment in the permafrost area was set at the current geothermal conditions. As a result, the permanent deformation of the embankment under train loading was obtained, and the permanent deformation under the train loads to the total embankment deformation was also analyzed.

Key words: vehicle load, permanent deformation, creep effect, permafrost regions

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