Dynamic shear modulus and damping ratio characteristics of undisturbed marine soils in the Bohai Sea,China

作     者：Zhang Yan Zhao Kai Peng Yanjv Chen Guoxing Zhang Yan;Zhao Kai;Peng Yanjv;Chen Guoxing

作者机构：Institute of Geotechnical EngineeringNanjing Tech UniversityNanjing 210009China Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu ProvinceNanjing 210009China National Institute of Natural HazardsMinistry of Emergency ManagementBeijing 100085China 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2022年第21卷第2期

页      面：297-312页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 

基　　金：National Natural Science Foundation of China under Grant Nos.51978334 and 51978335 

主　　题：Bohai Sea marine sediments dynamic shear modulus damping ratio sedimentary facies 

摘      要：This paper presents results from a series of stress-controlled undrained cyclic triaxial tests on the undisturbed marine silty clay,silt,and fine sand soils obtained from the Bohai Sea,*** is placed on the major factors for predominating the dynamic shear modulus(G)and damping ratio(λ)in the shear strain amplitude(γ_(a))from 10^(-5) to 10^(-2),involving depth,sedimentary facies types,and water content of marine *** empirical equations of the small-strain shear modulus(G_(max))and damping ratio(λ_(min))using a single-variable of depth H are established for the three marine soils.A remarkable finding is that the curves of shear modulus reduction(G/G_(max))and the damping ratio(λ)with increasing γ_(a) of the three marine soils can be simply determined through a set of explicit expressions with the two variables of depth H and water content *** finding is validated by independent experimental data from the *** the similar depths,the G value of the marine soils of terrestrial facies is the largest,followed b_(y) the neritic facies,and the G value of the marine soils of abyssal facies is the *** sedimentary facies types of the marine soils have slight effect on theλ*** significant finding is that the shear modulus reduction curves plotted against the γ_(a) of the three marine soils at the similar depths are significantly below those of the corresponding terrigenous soils,while the damping curves plotted against γ_(a) are just the *** results presented in this paper serve as a worthful reference for the evaluation of seabed seismic site effects in the Bohai Sea due to lack of experimental data.