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Property estimation of free-field sand in 1-g shaking table tests

Earthquake Engineering and Engineering Vibration 2022年第3期21卷 591-604页

作者： Xu Chengshun Jiang Zhiwei Du Xiuli Deng Lijun Li Zheng College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 100124China National Engineering Research Center of Green&Safe Construction Technology in Urban Rail Transit Beijing Urban Construction Design and Development Group Co.Ltd.Beijing 100037China Department of Civil Engineering Tsinghua UniversityBeijing 100084China Department of Civil and Environmental Engineering University of AlbertaEdmonton T6G2R3Canada UniversitéGustave Eiffel Département GERSLaboratoire Centrifugeuses Géotechniques(CG)Bouguenais 44341France

Experimental data taken from free-field soil in 1-g shaking table tests are valuable for seismic studies on soil-structure interaction.But the available data from medium-to large-scale shaking table tests were not abundant enough to cover a large variety of types and conditions of the soil.In the study,1-g shaking table tests of a 3-m-height sand column were conducted to provide seismic experimental data about sand.The sand was directly collected in-situ,with the largest grain diameter being 2 cm and containing a water content of 6.3%.Properties of the sand were estimated under the influence of white noise plus pulse and earthquake motions,including the settlement,the dynamic properties of the sand column,and the three soil layers′shear modulus degradation relationships.The estimated properties were then indirectly verified by means of finite element analysis.Results show that the estimated parameters were effective and could be used in numerical modeling to reproduce approximate seismic responses of the sand column.

关键词： 1-g shaking table test seismic sand response dynamic soil properties free-field sand

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