波浪作用引起的海洋结构物振动会以循环载荷的方式作用于海床,此类作用方式可导致海床内超静孔隙水压力上升有效应力下降,直至海床液化。为研究海洋结构物波致振动对多孔介质海床内超静孔隙水压力的演化规律,该文通过2台步进电机控制结构物模型运动的方法在水槽中进行试验研究,分别讨论了砂床特性、结构物自重、结构物振动的振幅和周期对海床内超静孔隙水压力的影响,给出了海床在结构物多变的加载振幅和周期作用下的液化特性。结果表明,颗粒直径越小的砂质海床,超静孔隙水压力的累积现象越明显;自重对超静孔隙水压力累积和瞬态变化影响显著;随波致振动的振幅增加或周期减小,超静孔隙水压力的累积及液化深度显著增加;海洋结构物底部海床靠近中部区域的超静孔隙水压力累积的幅值大于端部区域。
Abstract
The oscillation of the marine structure caused by the wave action could act on the seabed in the form of cyclic load, which results in the accumulation of the excess pore water pressure in the seabed, and the liquefaction of the seabed occasionally. In order to investigate the evolution of the excess pore water pressure in the porous seabed under the action of wave-induced oscillation of the marine structure, a two-dimensional flume experiment was carried out with marine structure movement controlled by two stepping motors. Experiments by using different sand beds, structure models with different the self-weights, and structure movement with different amplitude and periods were adopted. The liquefaction characteristics of the seabed through load amplitude and period was presented by using the excess pore water pressure, which indicated that the smaller the diameter of the sandy seabed, the more obvious the accumulation of excess pore water pressure, and the self-weight of the marine structure has a significant effect on the accumulation of excess pore water pressure. Moreover, the liquefaction depth increases with increase of the movement amplitude, and decreases with the increase of the movement period. Furthermore, the amplitude of the excess pore water pressure measured at the middle of the structure is greater than that at the end area.
关键词
海上风电 /
海洋结构物 /
液化 /
孔压力 /
波致振动 /
海床响应
Key words
offshore wind power /
liquefaction /
pore pressure /
wave-induced oscillation /
seabed response
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基金
海南省自然科学基金（519MS024）; 国家自然科学基金-青年基金（51609056）
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