Wave load is
one of the main environmental loads faced by the largescale
wide crosssectional submerged floating tunnel (SFT)
during sinking. To investigate the relationship between the wave loads of the
largescale wide SFT tube and environmental parameters
and geometric dimensions, a twodimensional numerical
model of the tube is established based on the computational fluid dynamics(CFD)
software FLUENT. By taking the roundend and hexagonal
sections as objects, the influence laws of the wave height, wave period,
submerged depth, and section size on the wave loads acting on the largescale wide SFT tubes are discussed. The relationship between
sectional size and wave diffraction coefficient is also examined. And the
comparison with the results of circular sections based on the Morison formula
is performed. The results show the following: (1) For the largescale wide crosssectional tubes with the
ratio of transverse size to wavelength greater than 0.2, the CFD numerical
simulation and diffraction theory are more suitable for wave load studies. (2)
The horizontal/vertical forces and overturning moment for the roundend and hexagonal sectional tubes all increase with the increase of
wave height and wave period. The wave forces corresponding to the two types of
sections all increase to certain degrees when the central width becomes larger.
And the significant increase of overturning moment is a key concern for the
wide section. (3) Increasing the submerged depth is an important measure to
reduce the wave overturning moment. When it reaches 30 m, the overturning
moments corresponding to different section types and widths decrease to a
smaller value. (4) The diffraction coefficients of the largescale wide SFT section are closely related to the sectional heightwideratio. When it increases, the
horizontal/vertical diffraction coefficient increases/decreases.
LIU Hongzhuan, CHEN Zhiwei, YI Zhuangpeng, CHEN Xingye
.
Wave Loads on LargeScale Wide Tube of Submerged
Floating Tunnel
During Sinking
[J]. Tunnel Construction, 2023
, 43(S1)
: 248
-256
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.029
