随机波浪作用下的水中悬浮隧道力学模型实验  

Mechanical Model Experiment of Submerged Floating Tunnel under Random Wave

作　　者：李勤熙 蒋树屏 LI Qin-xi;JIANG Shu-ping(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Merchants Chongqing Communication Research&Design Institute Co.,Ltd,Chongqing 400067,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《科学技术与工程》2018年第10期156-160,共5页Science Technology and Engineering

基　　金：国家交通运输部重大建设科技项目(2013318740050);重庆市研究生科研创新项目(CYB17130)资助

摘　　要：为了解随机不规则波作用下水中悬浮隧道(submerged floating tunnel,SFT)的力学特性,通过1∶80的物理模型实验,得到了2~6 cm波高下悬浮隧道管段断面压强分布和锚索张力的时间历程曲线。研究表明:(1)SFT断面压强大小随波高增大而增大,基于速度势的边界元法衍射理论估算得到的垂向波浪力较水平波浪力大2%~12%;(2)在随机不规则波作用下,悬浮隧道管段锚索张力时间历程曲线呈现出明显的随机性质。同时由于锚索的自振频率落入波浪的频率范围内,锚索的自振模态被激发,模型强迫振动周期约为8 s。In order to understand the mechanical characteristics of submerged floating tunnel(SFT)in the action of random irregular waves,through the physical model experiment of 1∶80,the time history curves of the pressure distribution and the tension of the anchor cable in the 2~6 cm wave heights are obtained.The results show as follows.①The pressure magnitude of SFT cross section increases with the wave height,based on the boundary element method of velocity potential,the vertical wave force calculated by diffraction theory is larger than horizontal wave force 2%~12%.②Under the action of random irregular waves,the time history curve of anchor rope tension in the tunnel section shows obvious randomness.At the same time,the natural frequency of the anchor falls into the frequency range of the wave,the natural vibration mode of the cable is excited,and the forced vibration period of the model is about 8 s.

关 键 词：海洋工程 水中悬浮隧道 不规则波浪 模型实验 随机振动 

分 类 号：U45[建筑科学—桥梁与隧道工程]