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The Simulation of Liquefaction and Stability of the Seabed Slope Ahead of Caofeidian Cape

Author: ZhangYu
Tutor: WuQiang
School: Beijing
Course: Geological Engineering
Keywords: Caofeidian Seabed Liquefaction Slope Stability Liquefaction Depth
CLC: P753
Type: PhD thesis
Year: 2012
Downloads: 56
Quote: 0
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The sediment around Caofedian Cape sea area is mainly composed by silt sand and fine sand. Because the underwater slope is steep, the seabed liquefaction may be induced, when the extreme wave condition occurs. Through physical tests and numerical simulations, this paper mainly studys on wave-induced seabed liquefaction, and how the liquefaction influences the slope stabilities.Firstly, a brief literature review of wave induced liquefaction is studied. Secondly, based on the surveyed documents, the ocean enviorment conditions of Caofeidian Cape are concluded. Then by using dynamic triaxial test and flume test, the sediment anti-liquefaction abilities and the sandbed responds to wave action are studied respectively. Through numerical simulation, based on finite element software, a forecast of how the liquefaction developed under different wave condition is studied. Finally, by using Geo-slope/W and Sweden slice method, the whole stability and the stability of liquefaction sediment are calculated and evaluated, and some control measures are suggested.As the results show, only when the wave height is large enough, the liquefaction of seabed may occur and, with the increase of the wave height, the depth of liquefaction increases sharply. Under the storm surge condition, the whole slope stability decrease sharply compare to the original, however, the stabilizing force is still larger than the slide force. Through the slice calculation of the liquified sediment, an obvious accumulated stress may threaten the safety of coastal structures which are built on the underwater slope.

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