Experimental study on permanent deformation characteristics of coarse-grained soil under repeated dynamic loading

作     者：Huihao Mei Sajjad Satvati Wuming Leng Huihao Mei;Sajjad Satvati;Wuming Leng

作者机构：China Railway 11 Bureau Group Co.Ltd.Wuhan 430061China Terracon ConsultantsIncOmahaNE 68144USA Department of Geotechnical EngineeringSchool of Civil EngineeringCentral South UniversityChangsha 410075China 

出 版 物：《Railway Engineering Science》 (铁道工程科学（英文版）)

年 卷 期：2021年第29卷第1期

页      面：94-107页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.51878666 and 51678572) 

主　　题：Repeated load triaxial tests Coarse grained soil Shakedown theory Dynamic stress Accumulated permanent strain Railway subgrade 

摘      要：Practical assessment of subgrade settlement induced by train operation requires developing suitable models capable of describing permanent deformation characteristics of subgrade filling under repeated dynamic *** this paper,repeated load triaxial tests were performed on coarse-grained soil(CGS),and the axial permanent strain of CGS under different confining pressures and dynamic stress amplitudes was *** deformation behaviors of CGS were categorized based on the variation trend of permanent strain rate with accumulated permanent strain and the shakedown theory.A prediction model of permanent deformation considering stress state and number of load cycles was established,and the ranges of parameters for different types of dynamic behaviors were also *** results indicated that the variational trend of permanent strain rate with accumulated permanent strain can be used as a basis for classifying dynamic behaviors of *** stress state(confining pressure and dynamic stress amplitude)has significant effects on the permanent strain *** accumulative characteristics of permanent deformation of CGS with the number of load cycles can be described by a power function,and the model parameters can reflect the influence of confining pressure and dynamic stress *** study’s results could help deepen understanding of the permanent deformation characteristics of CGS.