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张小玲, 赵显辉, 许成顺, 贾科敏. 不同倾斜方式对倾斜液化场地地震响应的影响分析[J]. 岩土工程学报, 2024, 46(4): 728-736. DOI: 10.11779/CJGE20230024
引用本文: 张小玲, 赵显辉, 许成顺, 贾科敏. 不同倾斜方式对倾斜液化场地地震响应的影响分析[J]. 岩土工程学报, 2024, 46(4): 728-736. DOI: 10.11779/CJGE20230024
ZHANG Xiaoling, ZHAO Xianhui, XU Chengshun, JIA Kemin. Influences of different inclination modes on seismic response of inclined liquefiable site[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(4): 728-736. DOI: 10.11779/CJGE20230024
Citation: ZHANG Xiaoling, ZHAO Xianhui, XU Chengshun, JIA Kemin. Influences of different inclination modes on seismic response of inclined liquefiable site[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(4): 728-736. DOI: 10.11779/CJGE20230024

不同倾斜方式对倾斜液化场地地震响应的影响分析

Influences of different inclination modes on seismic response of inclined liquefiable site

  • 摘要: 在倾斜场地地震液化后,土体的侧向流动扩展引起的场地失效以及大变形问题的研究中,不同的倾斜方式会对试验结果产生一定的影响,而目前针对不同倾斜方式对倾斜液化场地土体地震动力响应影响评价的研究成果还较为少见。根据课题组开展的水平液化自由场振动台试验,首先基于OpenSees有限元平台建立了水平液化自由场有限元计算模型,在数值模型中考虑了模型箱对场地土地震响应的影响,通过对比数值计算结果与试验结果验证了数值模型的可靠性。在此基础上建立了倾斜液化自由场有限元计算模型,分别建立了层剪箱整体倾斜模型、层剪箱场地土倾斜模型和刚性箱场地土倾斜3种不同的数值模型来模拟振动台试验中采用的不同的倾斜方式。通过对比,分析了在0.3g汶川地震卧龙波作用下3个数值模型计算得到的自由场土体动力响应结果,并讨论了3种不同的倾斜方式对计算结果的影响,最后给出了针对倾斜液化场地地震动力响应数值模拟和振动台试验研究中的一些有参考价值的结论。

     

    Abstract: In the study of the failure and large deformation of inclined site caused by lateral flow expansion of soil after seismic liquefaction, different inclined modes will have a certain impact on the test results, but the research results on the impact evaluation of seismic response of inclined liquefiable site are still relatively rare at present. In this study, a numerical model for horizontal liquefiable field is established based on the OpenSees finite element platform according to the completed shaking table tests, and the influences of the model box on the dynamic response of soil are considered in this numerical model, and the validity of numerical model is verified by comparing with the shaking table test results. Then the finite element numerical model for inclined liquefiable site is established based on the horizontal numerical model, and three different numerical models for inclined shear box model, inclined soil in shear box model and inclined soil in rigid box model are established to simulate different inclination modes in the shaking table tests. Through comparison, the dynamic responses of soil calculated by three numerical models under the action of 0.3g Wenchuan earthquake Wolong wave are examined, and the influences of three different inclination modes on the results are analyzed, and some valuable conclusions about the researches on the numerical simulation and shaking table tests of seismic dynamic response of inclined liquefiable sites are shown.

     

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