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Seismic performances of dyke on liquefiable soils
  • ISSN号:1674-7755
  • 期刊名称:Journal of Rock Mechanics and Geotechnical Enginee
  • 时间:2013.8
  • 页码:294-305
  • 分类:TU435[建筑科学—岩土工程;建筑科学—土工工程] U442.55[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
  • 作者机构:[1]School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China, [2]Disaster Prevention Research Institute, Kyoto University, Kyoto 611-0011,Japan
  • 相关基金:Financial supports provided by Science and Technological Fund of Anhui Province for Outstanding Youth(No.08040106830); National Natural Sciences Foundation of China(No.41172274)
  • 相关项目:可液化场地微型斜桩地震响应特性研究
中文摘要:

Various field investigations of earthquake disaster cases have confirmed that earthquake-induced liquefaction is a main factor causing significant damage to dyke,research on seismic performances of dyke is thus of great importance.In this paper,seismic responses of dyke on liquefiable soils were investigated by means of dynamic centrifuge model tests and three-dimensional(3D) effective stress analysis method which is based on a multiple shear mechanism model and a liquefaction front.For the prototype scale centrifuge tests,sine wave input motions with peak accelerations 0.806 m/s2,1.790 m/s2 and 3.133 m/s2 of varied amplitudes were adopted to study the seismic performances of dyke on the saturated soil layer foundation with relative density of approximately 30%.Then,corresponding numerical simulations were conducted to investigate the distribution and variations of deformation,acceleration,excess pore-water pressure(EPWP),and behaviors of shear dilatancy in the dyke and the liquefiable soil foundation.Moreover,detailed discussions and comparisons between numerical simulations and centrifuge tests were also presented.It is concluded that the computed results have a good agreement with the measured results by centrifuge tests.The physical and numerical models both indicate that the dyke hosted on liquefiable soils subjected to earthquake motions has exhibited larger settlement and lateral spread:the stronger the motion is,the larger the dyke deformation is.Compared to soils in the deep ground under the dyke and the free field,the EPWP ratio is much smaller in the shallow liquefiable soil beneath the dyke in spite of large deformation produced.For the same overburden depth soil from free site and the liquefiable foundation beneath dyke,the characteristics of effective stress path and stress-strain relations are different.All these results may be of theoretical and practical significance for seismic design of the dyke on liquefiable soils.

英文摘要:

Various field investigations of earthquake disaster cases have confirmed that earthquake-induced liquefaction is a main factor causing significant damage to dyke,research on seismic performances of dyke is thus of great importance.In this paper,seismic responses of dyke on liquefiable soils were investigated by means of dynamic centrifuge model tests and three-dimensional(3D) effective stress analysis method which is based on a multiple shear mechanism model and a liquefaction front.For the prototype scale centrifuge tests,sine wave input motions with peak accelerations 0.806 m/s2,1.790 m/s2 and 3.133 m/s2 of varied amplitudes were adopted to study the seismic performances of dyke on the saturated soil layer foundation with relative density of approximately 30%.Then,corresponding numerical simulations were conducted to investigate the distribution and variations of deformation,acceleration,excess pore-water pressure(EPWP),and behaviors of shear dilatancy in the dyke and the liquefiable soil foundation.Moreover,detailed discussions and comparisons between numerical simulations and centrifuge tests were also presented.It is concluded that the computed results have a good agreement with the measured results by centrifuge tests.The physical and numerical models both indicate that the dyke hosted on liquefiable soils subjected to earthquake motions has exhibited larger settlement and lateral spread:the stronger the motion is,the larger the dyke deformation is.Compared to soils in the deep ground under the dyke and the free field,the EPWP ratio is much smaller in the shallow liquefiable soil beneath the dyke in spite of large deformation produced.For the same overburden depth soil from free site and the liquefiable foundation beneath dyke,the characteristics of effective stress path and stress-strain relations are different.All these results may be of theoretical and practical significance for seismic design of the dyke on liquefiable soils.

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期刊信息
  • 《岩石力学与岩土工程学报:英文版》
  • 主管单位:中国科学院
  • 主办单位:中国科学院武汉岩土力学研究所、中国岩石力学与工程学会、武汉大学
  • 主编:
  • 地址:湖北省武汉市小洪山中科院武汉岩土所
  • 邮编:430071
  • 邮箱:
  • 电话:027-87198182
  • 国际标准刊号:ISSN:1674-7755
  • 国内统一刊号:ISSN:42-1801/O3
  • 邮发代号:
  • 获奖情况:
  • 国内外数据库收录:
  • 荷兰地学数据库
  • 被引量:50