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作者:

Zhang, Zhongxiang (Zhang, Zhongxiang.) | Chen, Su (Chen, Su.) | Li, Xiaojun (Li, Xiaojun.) | Wang, Yongzhi (Wang, Yongzhi.) | Long, Hui (Long, Hui.)

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摘要:

With the development of ocean engineering, the seismic response of saturated coral sand foundations has gained attention. Given the wide gradation characteristics of the coral sand site, it can be mainly categorized into two types: coral gravelly sand sites and coral sand sites. Two centrifuge shaking table tests were conducted based on a typical island reef structure to investigate the differences in the seismic responses between these two types of sites under offshore ground motion. The propagation of ground motion, pattern of pore pressure development, and surface settlement of the sites were thoroughly analyzed. The findings revealed significant discrepancies in the evolution of excess pore pressure between the coral gravelly sand and coral sand sites. The coral gravelly sand site did not experience liquefaction owing to well-drained channels, whereas partial liquefaction occurred at the coral sand site under the same ground motions. Additionally, a substantial amount of negative pore pressure was observed in the shallow layers of the coral gravelly sand site when the excess pore pressure ratios were low. The site amplification effect increased as the soil depth decreased at the coral gravelly and coral sand sites. However, liquefaction caused a significant attenuation of the acceleration in the shallow layer (z = 1 m) of the coral sand site. Furthermore, the settlement of the coral gravelly sand site continuously developed throughout the ground motion, including both the excess pore pressure accumulation and dissipation stages. In contrast, most of the surface settlement at the coral sand site occurred during the pore pressure accumulation stage.

关键词:

Offshore ground motions Centrifuge shaking table tests Coral sand Coral gravelly sand Seismic response Liquefaction

作者机构:

  • [ 1 ] [Zhang, Zhongxiang]Beijing Univ Technol, Beijing 100124, Peoples R China
  • [ 2 ] [Chen, Su]Beijing Univ Technol, Beijing 100124, Peoples R China
  • [ 3 ] [Li, Xiaojun]Beijing Univ Technol, Beijing 100124, Peoples R China
  • [ 4 ] [Li, Xiaojun]China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
  • [ 5 ] [Wang, Yongzhi]China Earthquake Adm, Inst Engn Mech, Harbin 150080, Peoples R China
  • [ 6 ] [Long, Hui]Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China

通讯作者信息:

  • [Chen, Su]Beijing Univ Technol, Beijing 100124, Peoples R China;;

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来源 :

SOIL DYNAMICS AND EARTHQUAKE ENGINEERING

ISSN: 0267-7261

年份: 2024

卷: 185

4 . 0 0 0

JCR@2022

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SCOPUS被引频次: 3

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