The Quasi-static Properties of Natural Marine Clay under Tidal Low Frequency Cyclic Loading in Yangtze Estuary, China

3rd Annual International Workshop on Materials Science and Engineering

Li, Dan^1 ; Zhou, Nianqing^1 ; Wu, Xiaonan^2 ; Yin, Jiachun^2

College of Civil Engineering, Tongji University, Shanghai

200000, China^1

Communications Construction Contracting Co. Ltd., Shanghai

200000, China^2

关键词: Confining pressures;    Critical stress ratio;    Cyclic response;    Cyclic tri-axial tests;    Cyclic vibration;    Loading frequencies;    Reversible strain;    Yangtze estuary , China;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/250/1/012042/pdf
DOI  :  10.1088/1757-899X/250/1/012042

来源: IOP

【 摘 要 】

The enclosure engineering of tidal flats behind Changxing Island is taken as the research background. In order to explore the undrained cyclic response of natural marine clay on tidal level periodic changing, the stress-controlled low frequency cyclic tri-axial tests and static creep tests are conducted on natural K0-consolidated Shanghai clay. In the series I tests, samples are cyclically sheared by low-frequency cyclic loading until stability or failure, the accumulative behavior and reversible strain are studied. The effects of confining pressure and stress ratio are also investigated. Significantly, loading frequency is a key factor in controlling the cyclic behavior. In the series II tests, special attention is given to the low frequency cyclic vibration effect on the undrained cyclic tests by comparison with the static creep tests. The critical stress ratio of low frequency cyclic behavior is less than static creep strength.