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为探究内孤立波作用下南海北部陆坡浅表沉积物的动力响应特征,采用实测内孤立波和沉积物参数,建立两层流内孤立波-无限深度海床模型,基于二维Boit固结理论,计算不同沉积物物理力学参数和内孤立波参数条件下,无限深度内位移场和超孔隙水压力的分布情况,探讨不同变量下内孤立波引发的沉积物动力响应特征。研究表明南海北部陆坡沉积物的渗透率变化对动力响应特征的影响较小,孔隙度影响程度中等,剪切模量和饱和度影响较大,且饱和度是首要影响因素;细砂、砂质粉砂和黏土质粉砂三种南海北部陆坡浅表沉积物响应的超孔隙水压力在相同深度时逐渐减小;水平位移逐渐增大,垂向位移逐渐减小。
In order to explore the dynamic response characteristics of the shallow surface sediments in the northern SCS under the action of internal solitary waves, a two-layer solitary wave-infinite depth sea bed model was established by using the measured internal solitary wave and sediment parameters. Based on the two-dimensional Boit consolidation theory , The distributions of displacement field and excess pore water pressure in infinite depth under different sediment physical and mechanical parameters and internal solitary wave parameters were calculated to investigate the dynamic response characteristics of sediment induced by internal solitary wave under different variables. The results show that the permeability of the continental slope sediments in the northern South China Sea has less influence on the dynamic response characteristics, and the influence degree of porosity is moderate, the influence of shear modulus and saturation is greater, and the saturation is the primary factor; fine sand, sandy The excess pore water pressure responding to the shallow sediments of the northern South China Sea slopes of silt and clayey silt decreased at the same depth. The horizontal displacement gradually increased and the vertical displacement decreased gradually.