陈同彦, 薛凉, 刘锦昆, 贾永刚, 冯春健, 梁天阳, 权永峥. 2021: 海底斜坡变形滑动原位观测研究. 工程地质学报, 29(S1): 88-95. DOI: 10.13544/j.cnki.jeg.2021-0422
    引用本文: 陈同彦, 薛凉, 刘锦昆, 贾永刚, 冯春健, 梁天阳, 权永峥. 2021: 海底斜坡变形滑动原位观测研究. 工程地质学报, 29(S1): 88-95. DOI: 10.13544/j.cnki.jeg.2021-0422
    CHEN Tongyan, XUE Liang, LIU Jinkun, JIA Yonggang, FENG Chunjian, LIANG Tianyang, QUAN Yongzheng. 2021: IN SITU OBSERVATION OF SUBMARINE SLOPE DEFORMATION AND SLIDING. JOURNAL OF ENGINEERING GEOLOGY, 29(S1): 88-95. DOI: 10.13544/j.cnki.jeg.2021-0422
    Citation: CHEN Tongyan, XUE Liang, LIU Jinkun, JIA Yonggang, FENG Chunjian, LIANG Tianyang, QUAN Yongzheng. 2021: IN SITU OBSERVATION OF SUBMARINE SLOPE DEFORMATION AND SLIDING. JOURNAL OF ENGINEERING GEOLOGY, 29(S1): 88-95. DOI: 10.13544/j.cnki.jeg.2021-0422

    海底斜坡变形滑动原位观测研究

    IN SITU OBSERVATION OF SUBMARINE SLOPE DEFORMATION AND SLIDING

    • 摘要: 舟山群岛海域潮汐通道较多,海底斜坡失稳现象普遍发育,多发的海底滑坡对海底光缆、围海工程、港口码头等近岸设施具有很大威胁,针对其发生机制的调查研究越发受到重视。本文基于自主研发的海床变形观测系统,配合孔隙水压力观测系统和水动力观测系统,在舟山朱家尖岛西南侧典型海底斜坡自2019年8月29日开展为期75d的变形观测。结果表明:观测范围沉积物变形分为3个部分,海底斜坡底部潜在滑动面(海床下12~13.5m)沉积物累积变形量约0.75mm,侧向变形过程呈现阶梯变化特征且变形方向与斜坡倾向吻合,顶部变形与潮汐方向一致。观测发现潮位变化会改变沉积物超孔隙水压力变化,由其引发的深、浅层沉积物超孔压差改变是观测区海底斜坡潜在滑动面侧向变形的主要触发因素。

       

      Abstract: Tidal channels are widely distributed in the Zhoushan islands, and submarine slope instability events are widely developed. Frequent submarine landslides pose a great threat to offshore facilities such as submarine optical cables, sea reclamation projects, ports and wharfs. The investigation and research on its occurrence mechanism has attracted more and more attention. Based on the self-developed seabed deformation observation system, combined with the pore water pressure observation system and hydrodynamic observation system, this paper has carried out 75 day deformation observation on the typical seabed slope in the southwest of Zhujiajian island in Zhoushan since August 29, 2019. The results show that the sediment deformation in the observation range is divided into three parts. The cumulative deformation of the sediment on the potential sliding surface at the bottom of the seabed slope(12~13.5m under the seabed) is about 0.75mm. The lateral deformation process presents the characteristics of step change, and the deformation direction is consistent with the slope tendency, and the top deformation is consistent with the tidal direction. It is found that the change of tide level will change the change of sediment excess pore water pressure, and the change of excess pore pressure difference between deep and shallow sediments is the main trigger factor for the lateral deformation of potential sliding surface of submarine slope in the observation area. There are many tidal channels in the sea area of Zhoushan islands, and the instability of submarine slopes is widely developed.

       

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