DISASTERS CAUSED BY WAVE-INDUCED SEDIMENT LIQUEFACTION AT THE YELLOW RIVER DELTA,CHINA

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.