Tham khảo tài liệu 'hydrodynamics natural water bodies part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 212 Hydrodynamics - Natural Water Bodies Moreover corresponding to the wave-frequency peak and low-frequency peak of the frequency spectra of the cable tensions there occur the wave-frequency motions and low-frequency motions in the tunnel element. This also reflects directly the interrelation of the tunnel element motions and the cable tensions. 4. Conclusions The motion dynamic characteristics of the tunnel element and the tensions acting on the controlling cables in the immersion of the tunnel element under irregular wave actions are experimentally investigated in this chapter. The irregular waves are considered normal incident and the influences of the immersing depth of the tunnel element the significant wave height and the peak frequency period of waves on the tunnel element motions and the cable tensions are analyzed. Some conclusions are drawn as follows. As the immersing depth is comparatively small the motion responses of the tunnel element are relatively large. Besides the wave-frequency motions the tunnel element has also the low-frequency motions that result from the actions of cables. For the sway of the tunnel element for different immersing depth the low-frequency motion is always larger than the wave-frequency motion. While for the heave with the increase of the immersing depth the motion turns gradually from that the low-frequency motion is dominant into that the wavefrequency motion is dominant. For the large significant wave height the motion responses of the tunnel element are accordingly large. The peak values of the frequency spectra of the motion responses increase rapidly with the increase of the peak frequency period of waves. Especially for the heave motion of the tunnel element the peak frequency of the response spectrum corresponding to the low-frequency motion increases with the increasing peak frequency period. The total force of the cables at the offshore side is larger than that of the cables at the onshore side of the tunnel .
