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| Permanent deformation characteristics and shakedown analysis of coarse-grained embankment materials under moving wheel loads#br# |
| ZHENG Keyang1，2，XIAO Yuanjie1，3，WANG Meng1，WANG Bin4，YAN Jinlong4，CHEN Xiaobin1，3，YE Xinyu1#br# |
(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. Guangdong Communication Planning and Design Institute Co.，Ltd.，Guangzhou，Guangdong 510507，China；3. Ministry of Education (MOE) Key Laboratory of Engineering Structures of Heavy Haul Railway，Changsha，Hunan 410075，China；4. North Yutian Line Unit，Chawu Track Division，Daqin Railway Co.，Ltd.，Tangshan，Hebei 064107，China)
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Abstract Conventional repeated load triaxial(RLT) tests can only simulate the cyclic load pulsed vertically. In order to study long-term deformation and failure mechanisms due to moving wheel loads more realistically，a series of RLT tests with both constant and variable confining pressure levels were conducted on typical base and subbase unbound granular materials. Different realistic in-situ stress paths defined by stress path slope，stress path length and minimum mean principal stress were applied. The coupling effect of cyclic deviatoric and confining stress components on the accumulation of the axial plastic strain was explored. Considering that the existing shakedown criteria for permanent deformation behavior cannot accurately distinguish different stages of permanent deformation behavior and are established from traditional RLT tests with constant confining pressure，a new criterion was proposed to address such insufficiencies. The improved accuracy and applicability of the modified shakedown analysis method and its criteria were confirmed by the realistic stress path test results obtained in this study.
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2020, Vol. 39 
