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On Application of a Caisson with Suction to Breakwater Structure

吸力沉箱在防波堤结构中的应用

基本信息

批准号：
09650558
负责人：
TAKATANI Tomiya
金额：
$ 2.11万
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：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650558/
关键词：
Caisson with Suction Breakwater Irregular Wave Pore Water Pressure Wave Pressure Experiment Pile Foundation Dynamic Response Analysis サクシュンケーソンサクションケ-ソン

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. Also, the dynamic response of a caisson-type structure resting on pile foundation loaded by waves was numerically evaluated by FEM analysis in order to investigate the feasibility of a pile with an expanding end to support such offshore structure foundations.The results obtained in this research is summarized as follows :1) The displacement response at an estimating location under a caisson structure becomes small and the phase angle is large as the non-dimensional frequency wa/Vs and the depth z/a of an estimating location increases. Consequently, 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) When a caisson is installed on a pile foundation, the displacement response in the seabed around the pile foundation, as well as that of the caisson, are almost similar regardless of the connecting condition between caisson and piles.5) The pile foundation prevents the differential settlement in the seabed under a caisson, because the wave-induced pore water pressure beneath the caisson is distributed to the deep foundation around the expanding base.

为了将考虑吸力作用的带裙式钢沉箱应用于软海床上的海岸结构，采用先进的沉箱-海床相互作用分析方法，模拟了带吸力的沉箱结构及其软基在波浪作用下的动力响应。同时，为了探讨扩端桩支撑沉箱结构基础的可行性，采用有限元方法对沉箱结构在波浪荷载作用下的动力响应进行了数值分析。研究结果表明：1)沉箱结构下估计位置的位移响应随无因次频率Wa/vs和估计位置深度z/a的增大而变小，相角变大。因此，沉箱结构下海床的位移响应很大程度上依赖于沉箱结构的裙长，如沉箱本身的位移响应所示。2)在海床上安装一个刚度和剪切波速较小的吸力沉箱结构时，必须仔细考虑位移和相响应的行为。3)沉箱下的孔压动力响应在洞室附近有一个最大值，并随着距离沉箱底部的增加而逐渐减小。4)当沉箱安装在桩基础上时，桩基础周围海床的位移响应，5)桩基础防止了沉箱下海床的差异沉降，因为沉箱下的波浪孔压分布在膨胀基础周围的深层基础上。