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

作　　者：Wei Ma Tuo Chen 

机构地区：[1]State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Science

出　　处：《Research in Cold and Arid Regions》2015年第6期645-653,共9页寒旱区科学（英文版）

基　　金：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);the Project for Excellence, State Key Laboratory of the National Natural Science Foundation of China (No. 41023003)

摘　　要：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 estab- lished 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.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 estab- lished 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.

关 键 词：vehicle load permanent deformation creep effect permafrost regions 

分 类 号：U213.1[交通运输工程—道路与铁道工程]