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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.

水下浮动隧道(SFT)是一种由锚定在海床上的张力腿系泊的、靠隧道浮力张拉的潜式结构物。尽管SFT尚未建成，但预计它将成为海峡两岸最具吸引力的技术之一。本研究的目的是探讨SFT的设计方法。本研究的主要成果如下：1)SFT上的水动力可以用位势理论来计算，也可以用扩展的Morison方程来计算。2)提出了波浪和地震作用下SFT三维和二维动力分析的解析模型。3)在SFT设计中，张力腿类型和表观比重的选择是防止张力腿松弛的重要因素。4)波浪和地震作用是SFT设计中的主要荷载。5)竖直腿SFT的力学和结构特性，对斜腿和竖斜组合腿进行了分析。6)波浪引起的张拉腿疲劳可能是SFT设计中的关键问题。提出了一种实用的张拉腿疲劳验算方法。7)隧道单元间节点的刚度对SFT的动力特性有很大影响。