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Response Characteristics of Seabed Around an Offshore Foundation Structure Subjected to Suction Force

近海基础结构周围海底吸力响应特性

基本信息

批准号：
07650584
负责人：
TAKATANI Tomiya
金额：
$ 1.41万
依托单位：
Maizuru National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

To apply a steel caisson with skirt, which takes suction effect into the stability, to the coastal structure on soft seabed, dynamic responses of the caisson structure with suction and its soft foundation under wave attack were simulated by an advanced caisson structure-seabed interaction analysis. In this research the seabed was assumed to be a fluid-saturated poroelasic medium whose behavior is governed by Biot's theory of wave propagation. Dynamic responses of a caisson structure with suction and seabed around it were numerically evaluated for wave pressures acting on the front surface of the caisson, which were measured under the irregular wave in the experimental basin. The effects of the skirt length and suction on the dynamic response of caisson structure foundation were numerically investigated for some material properties of seabed foundation.The results obtained in this research is summarized as follows :1)The displacement response of seabed under a caisson structure greatly depends on the skirt length of a caisson structure as seen in the displacement response of a caisson itself.2)It is necessary to give careful consideration to the behavior of both the displacement and phase responses in case of installing a caisson structure with suction on the seabed, whose stiffness and shear wave velocity are small.3)The dynamic response of pore water pressure under caisson has a maximum value in the vicinity of compartments, and also gradually decreases with the distance from the bottom of caisson increasing.4)The pore water pressure response in seabed foundation depends on not only the suction and frictional force acting on the skirt part of a caisson structure but also the stiffness of seabed around it.5)The caisson with suction is effective in soft seabed and has superiority in the cases of the lower permeability of seabed, the more providing compartments.

为将吸力作用考虑到稳定性中，将带裙座钢沉箱应用于软海床上的海岸结构，采用先进的沉箱结构-海床相互作用分析方法，模拟了带吸力沉箱结构及其软基在波浪冲击下的动力响应。在这项研究中，海床被假定为流体饱和的多孔弹性介质，其行为由毕奥的波传播理论控制。在不规则波作用下，通过对沉箱前表面波浪压力的测量，对沉箱结构在吸力作用下的动力响应进行了数值分析。针对海底基础的一些材料特性，数值研究了裙长和吸力对沉箱结构基础动力响应的影响，得到了如下结果：1）沉箱结构下海床的位移响应很大程度上取决于沉箱结构的裙长，这从沉箱本身的位移响应中可以看出。2）在海床上安装有吸力的沉箱结构时，必须仔细考虑位移和相位响应的特性。沉箱下孔隙水压力的动力响应在隔室附近有一个极大值，随着距沉箱底部距离的增加，桩周位移也逐渐减小。海床地基中的孔隙水压力响应不仅取决于作用在沉箱结构裙部的吸力和摩擦力，还与海床的刚度有关5）吸力式沉箱在软海床中是有效的，在海床渗透性较低、提供隔舱较多的情况下具有优越性。