|Table of Contents|

Citation:
　CHEN Zhi-jie*,WANG Yong-xue,WANG Guo-yu and HOU Yong.Frequency responses of immersing tunnel element under wave actions[J].Journal of Marine Science and Application,2009,(1):18-26.
Click and Copy

Frequency responses of immersing tunnel element under wave actions

Info

Title:
Frequency responses of immersing tunnel element under wave actions
Author(s):
CHEN Zhi-jie*;  WANG Yong-xue;  WANG Guo-yu and HOU Yong
Affilations:
Author(s):
CHEN Zhi-jie*;  WANG Yong-xue;  WANG Guo-yu and HOU Yong
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
Keywords:
immersed tunnel;  motion response;  frequency domain;  linear potential theory
分类号:
-
DOI:
-
Abstract:
The immersion of large-scale tunnel elements is one of the most important working procedures in the construction of an underwater immersed tunnel. To investigate the dynamic characteristics of tunnel element in the process of immersion, based on the twin-barge immersing operation method, the frequency-domain analysis of the tunnel element motions under wave actions was made. The linear wave diffraction theory and the three-dimensional source distribution method were applied to calculate the wave loads and motion responses of the tunnel element under different incident wave conditions. In the study, movement of the two barges in the water was assumed to be small and was ignored. Cable tension was computed by the static method. On the basis of the above theories, a computer program was made, and two cases were taken to check the validity of the program. The results showed that wave loads acting on the immersed tunnel element are relatively large near the water surface, and they decrease with the increase of immersing depth of the tunnel element. Wave loads first increase, then decrease, with the increase of wave period. The motion responses of the tunnel element are also generally large near the water surface and decrease as the immersing depth increases.

References:

[1] GURSOY A, VAN MILLIGEN P C, SAVEUR J, et al. Immersed and floating tunnels[J]. Tunnelling and Underground Space Technology, 1993, 8(2): 119-123.
 [2] CHEN Shaozhang. Design and construction of immersed tunnel[M]. Beijing: Science Press, 2002(in Chinese).
[3] ZHAN Dexin, ZHANG Lewen, ZHAO Chengbi, et al. Numerical simulation and visualization of immersed tube tunnel maneuvering and immersing[J]. Journal of Wuhan University of Technology (Transportation Science & Engineering), 2001, 25(1): 16-20(in Chinese).
 [4] ZHOU Yu. Study on the above-water operation of large-scale immersed tube tunnel element[D]. Shanghai: Shanghai Jiaotong University, 2001(in Chinese).
 [5] NEWMAN J N. Marine Hydrodynamic[M]. Cambridge: Massachusetts Institutes of Technology Press, 1977.
[6] WEHAUSEN J V, LAITONE E V. Surface waves[M]. Berlin: Springer-Verlag, 1960: 446-778.
 [7] HESS J L, SMITH A M O. Calculation of non-lifting potential flow about arbitrary three-dimensional bodies[J]. Journal of Ship Research, 1964, 8(2): 22-44.
[8] NATARAJAN R, GANAPHY C. Analysis of moorings of a berthed ship[J]. Marine Structures, 1995, 8: 481-499.
 [9] HE Wuzhou, DAI Yishan. Calculation of three-dimensional hydrodynamic coefficients by simple Green’s function technique[J]. Ship Building of China, 1986, 2: 1-15(in Chinese).
[10] GARRISON C J. Hydrodynamics loading of large offshore structures: Three-dimensional source distribution method. In: Numerical Methods in Offshore Engineering[M]. Chichester: Wiley, 1978: 87-140.

Memo

Memo:
-
Last Update: 2010-04-19