DISASTERS CAUSED BY WAVE-INDUCED SEDIMENT LIQUEFACTION AT THE YELLOW RIVER DELTA,CHINA
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摘要: 选择黄河口浅滩不同沉积历史的4个典型研究区,取样进行室内物理力学参数测试,现场利用普氏贯入仪测量1m深度内土体强度在二维空间上的分布。然后,建立波浪作用下土体破坏的计算模型,计算50年一遇情况下土体破坏状况,并与调查的浅滩灾害比较。通过研究发现,黄河口浅滩沉积物处于超固结状态,且超固结比随深度增加而减小;浅滩沉积物强度在空间上表现出较强的非均匀性,大王北和刁口地区沉积物的强度要大于新滩和广利港地区的;沉积物在50年一遇波浪荷载下局部液化破坏深度可超过90cm,土体强度的空间非均匀性导致液化破坏后形成灾害现象。计算得到的灾害与现场调查结果具有一定的相似性,测试方法和计算方法可定量分析黄河口浅滩沉积物灾害的形成与特征。Abstract: Four areas of different age at the shallow shoal of Yellow River delta were chosen for this study. Some physical and mechanical parameters of sediments were measured indoor,and the strength of sediments at one meter in depth in two dimensions was measured by Proctor Penetrometer in-Situ.Then,a model of soil liquefaction failure was established to calculate the sediment failure under a wave case of 50 years.The calculated geomorphology was compared with the investigated in-Situ.The study reveals that (1)the sediment at the shallow delta is over consolidated,and the over consolidation ratios(OCR)decrease with depth.(2)the sediment strength is very non-uniform,and the strength at Da Wang Bei and Diao Kou is higher than that of Xin Tan,Guang Li port.(3)the sediment liquefaction depth could be beyond 90cm under a wave case of 50 years,and the non-uniformity of sediment strength will cause disasters after liquefaction failure.The landscape established by calculation is similar to the real.The methods of testing and quantitative analysis used by the authors could be extended to the further study of the disasters caused by wave-induced sediment liquefaction.
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Key words:
- shallow delta /
- disaster /
- liquefaction /
- the Yellow River delta
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