Influence of repeated freeze-thaw on dynamic modulus and damping ratio properties of silty sand

作     者：TianLiang Wang Chao Ma Han Yan JianKun Liu 

作者机构：School of Civil EngineeringShijiazhuang Tiedao University Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of EducationShijiazhuang Tiedao University School of Civil Engineering Beijing Jiaotong University Northwest CorporationChina Railway Construction Engineering Group 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2013年第5卷第5期

页      面：572-576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：funded by the National Key Basic Research Development Plan of China (Grant No. 2012CB026104) the National Natural Science Foundation (NSFC) of China (Grant Nos.51208320 and 51171281) 

主　　题：freeze-thaw cycles silty sand dynamic modulus damping ratio 

摘      要：Under repeated freezing and thawing in deep seasonal frozen regions, the stability and strength of the soil are imposed in the form of large uneven settlement, instability and strength reduction, which affect the normal operation of railway lines. This study is to obtain the influencing rules of freeze-thaw on the dynamic properties （dynamic strain, confining pressure and compactness） of silty sand. Based on an amount of inner tests, the dynamic modulus and damping ratio properties of silty soil subjected to repeated freeze-thaw cycles were deeply researched and analyzed. The results are as follows： At the same dynamic strain, the relationship of dynamic stress and freeze-thaw cycles presents negative cor- relation, and the relationship of dynamic stress, confining pressure and compactness present positive correlation. The dynamic modulus double decreases while the damping ratio double increases with incremental increase in dynamic strain. The dynamic modulus sharply decreases while the damping ratio increases with incremental increase in freeze-thaw cycles, and then the changes level off after six freeze-thaw cycles. The dynamic modulus increases while the damping ratio decreases as the confining pressure and compactness increase at the same strain level.