| Experimental study of seismic cyclic loading effects on small strain shear modulus of saturated sands |
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| 作者姓名： | 周燕国 陈云敏 黄博 |
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| 作者单位： | Department of Civil Engineering，Zhejiang University，Hangzhou 310027，China，Department of Civil Engineering，Zhejiang University，Hangzhou 310027，China，Department of Civil Engineering，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | 国家自然科学基金，Provincial Department of Education |
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| 摘 要： | INTRODUCTION Adequate information on dynamic soil proper-ties, especially dynamic shear modulus and dampingratio, is essential for accurate computations of groundresponse and soil-structure interaction problems.Many experimental investigations carried out onsandy soils through resonant column test or improvedcyclic triaxial test in early studies (Hardin and Richart1963; Hardin and Black, 1968; Drnevich and Richart,1970; Seed and Idriss, 1971; Kokusho, 1980) showedthat the small …
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| 关 键 词： | 饱和沙 剪切张力系数 地基 土壤 动力学 |
Experimental study of seismic cyclic loading effects on small strain shear modulus of saturated sands |
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| Zhou Yan-guo,Chen Yun-min,Huang Bo.Experimental study of seismic cyclic loading effects on small strain shear modulus of saturated sands[J].Journal of Zhejiang University Science,2005,6(3):229-236. |
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| Authors: | Zhou Yan-guo Chen Yun-min Huang Bo |
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| Institution: | (1) Department of Civil Engineering, Zhejiang University, 310027 Hangzhou, China |
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| Abstract: | The seismic loading on saturated soil deposits induces a decrease in effective stress and a rearrangement of the soil-particle structure, which may both lead to a degradation in undrained stiffness and strength of soils. Only the effective stress influence on small strain shear modulus Gmax is considered in seismic response analysis nowadays, and the cyclic shearing induced fabric changes of the soil-particle structure are neglected. In this paper, undrained cyclic triaxial tests were conducted on saturated sands with the shear wave velocity measured by bender element, to study the influences of seismic loading on Gmax. And Gmax of samples without cyclic loading effects was also investigated for comparison. The test results indicated that Gmax under cyclic loading effects is lower than that without such effects at the same effective stress, and also well correlated with the effective stress variation. Hence it is necessary to reinvestigate the determination of Gmax in seismic response analysis carefully to predict the ground responses during earthquake more reasonably. |
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| Keywords: | Cyclic loading Seismic response analysis Undrained cyclic triaxial test Small strain shear modulus Effective stress Bender element Soil-particle structure |
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