DEVELOPMENT OF DESIGN PROCEDURES FOR SUBMERGED FLOATING TUNNELS

水下浮动隧道设计程序的开发

基本信息

批准号：
06555128
负责人：
KAKUTA Yoshio
金额：
$ 7.17万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555128/
关键词：
submerged floating tunnel tension leg dynamic behavior nonlinear analysis hydrodynamic force

项目摘要

A submerged floating tunnel (SFT) is a kind of submersible structures moored by tension legs anchored in the sea bed and tensioned by buoyancy of the tunnel. Although SFT has not been constructed, it is expected as one of the most attractive technology for crossing straits. The purpose of this study is to investigate the design procedures for SFT.The important results obtained in this study are summarized as follows ;1) Hydrodynamic force acting on SFT can be evaluated by potential theory as well as by a modified Morison's equation expanded to apply to such problems. The values of the added mass coefficient and the damping coefficient in the modified Morison's equation have been proposed for the design of SFT.2) Analytical Models for 3-and 2-dimensional dynamic analyzes of SFT subjected to wave and seismic action have been proposed.3) In the design of SFT selection of tension leg type and apparent specific gravity is important to prevent slack of tension legs which may cause impact force called snap.4) Wave and seismic action are predominant loads in the design of SFT constructed in the coastal zone of Japan.5) Mechanical and structural characteristics of SFTs with vertical legs, oblique legs and combined vertical and oblique legs are analyzed.6) Fatigue of tension legs due to wave may be critical in the design of SFT.A practical method for checking safety for fatigue of tension legs has been proposed.7) Rigidity of the joint between tunnel elements has large effects on the dynamic properties of SFT.

淹没的浮动隧道（SFT）是一种用张力腿固定在海床中的张力腿并因隧道浮力而张紧的潜水结构。尽管尚未建造SFT，但预计它是越过海峡的最具吸引力的技术之一。这项研究的目的是研究SFT的设计程序。本研究中获得的重要结果总结如下：1）作用于SFT的水动力，可以通过潜在理论以及通过改进的Morison方程来评估，以应用于应用以应用以应用解决这些问题。已经提出了用于设计SFT的修饰摩里方程中添加的质量系数和阻尼系数的值。2）已提出了三维和二维动力学分析的分析模型，该模型已提出了经过波浪和地震作用的SFT。 3）在SFT选择张力腿类型和明显的特异性重力时，对于防止张力腿松弛至关重日本区域。5）分析具有垂直腿，倾斜腿以及垂直和斜腿组合的SFT的机械和结构特性。6）SFT的设计可能至关重要。已经提出了张力腿疲劳的安全性。7）隧道元素之间的关节刚度对SFT的动态特性具有很大的影响。