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

Earthquake Engineering and Engineering Vibration 2022年第2期21卷 297-312页

作者： Zhang Yan Zhao Kai Peng Yanjv Chen Guoxing Institute of Geotechnical Engineering Nanjing Tech UniversityNanjing 210009China Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province Nanjing 210009China National Institute of Natural Hazards Ministry of Emergency ManagementBeijing 100085China

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.

关键词： Bohai Sea marine sediments dynamic shear modulus damping ratio sedimentary facies

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dynamic shear modulus of undisturbed soil under different consolidation ratios and its effects on surface ground motion

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Earthquake Engineering and Engineering Vibration 2013年第4期12卷 561-568页

作者： Sun Jing Gong Maosheng Tao Xiaxin Institute of Civil Engineering Heilongjiang University Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration School of Civil Engineering Harbin Institute of Technology

The dynamic shear modulus for three types of undisturbed soil under different consolidation ratios is presented by using the resonant column test method. Its effects on surface ground motion is illustrated by calculation. The test results indicate that the power function is a suitable form for describing the relationship between the ratio of the maximum dynamic shear modulus due to anisotropic and isotropic consolidations and the increment of the consolidation ratio. When compared to sand, the increment of the maximum dynamic shear modulus for undisturbed soil due to anisotropic consolidation is much larger. Using a one-dimensional equivalent linearization method, the earthquake influence factor and the characteristic period of the surface acceleration are calculated for two soil layers subjected to several typical earthquake waves. The calculated results show that the difference in nonlinear properties due to different consolidation ratios is generally not very notable, but the degree of its influence on the surface acceleration spectrum is remarkable for the occurrence of strong earthquakes. When compared to isotropic consolidation, the consideration of actual anisotropic consolidation causes the characteristic period to decrease and the earthquake influence factor to increase.

关键词： dynamic shear modulus consolidation ratio undisturbed soil resonant column test surface ground motion

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A Modified approach for calculating dynamic shear modulus of stiff specimens by resonant column tests

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Earthquake Engineering and Engineering Vibration 2006年第1期5卷 143-150页

作者：袁晓铭孙静孙锐 Institution of Engineering Mechanics China Earthquake Administration Institute of Civil Engineering Heilongjiang University

An error analysis of the dynamic shear modulus of stiff specimens from tests performed by a new resonant column device developed by the Institute of Engineering Mechanics, China was conducted. A modified approach for calculating the dynamic shear modulus of the stiff specimens is presented. The error formula of the tests was deduced and parameters that impact the accuracy of the test were identified. Using six steel specimens with known standard stiffness as a base, a revised dynamic shear modulus calculation for stiff specimens was formulated by comparing three of the models. The maximum error between the test results and the calculated results shown by curves from both the free-vibration and the resonant-vibration tests is less than 6%. The free-vibration and resonant-vibration tests for three types of stiff samples with a known modulus indicate that the maximum deviation between the actual and the tested value using the modified approach were less than 10%. As a result, the modified approach presented here is shown to be reliable and the new device can be used for testing dynamic shear modulus of any stiff materials at low shear strain levels

关键词： stiff specimens resonant column device dynamic shear modulus modified formula error analysis

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Test on dynamic characteristics of subgrade of heavy-haul railway in cold regions

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Research in Cold and Arid Regions 2015年第5期7卷 605-610页

作者： YingYing Zhao XianZhang Ling ZiYu Wang XinYan Shao LiHui Tian Lin Geng School of Civil Engineering Harbin Institute of Technology School of Architectural Engineering Jiamusi University

dynamic characteristics of heavy-haul railway subgrade under vibratory loading in cold regions are investigated via low-temperature dynamie triaxial tests with multi-stage eyelic loading process. The relationship between dynamic shear stress and dynamic shear strain of frozen soil of subgrade under train loading and the influence of freezing temperatures on dynamic constitutive relation, dynamic shear modulus and damping ratio are observed in this study. Test results show that the dynamic constitutive relations of the frozen soils with different freezing temperatures comply with the hyperbolic model, in which model parameters a and b decrease with increasing freezing temperature. The dynamic shear modulus of the frozen soils decreases with increasing dynamic shear strains initially, followed by a relatively smooth attenuation tendency, whereas increases with decreasing freezing temperatures. The damping ratios decrease with decreasing freezing temperatures. Two linear functions are defined to express the linear relationships between dynamic shear modulus （damping ratio） and freezing temperature, respectively, in which corresponding linear coefficients are obtained through multiple regression analysis of test data.

关键词： low-temperature dynamic triaxial test dynamic constitutive relation dynamic shear modulus damping ratio freezing temperature

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