水中悬浮隧道合理截面数值模拟分析  

Numerical simulation analysis on rational cross-section of submerged floating tunnel

作　　者：罗刚[1] 周晓军[1] 张川[1] 申奇[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道建筑》2012年第12期32-36,共5页Railway Engineering

基　　金：国家自然科学基金资助项目(10972186)

摘　　要：为研究悬浮隧道的合理截面形式,采用大涡模拟法,按日本喷火湾海况条件分析了圆形、椭圆形、耳形、六边形和矩形5种截面悬浮隧道周向稳态压强分布、所受到的流体升力和阻力;以圆形断面为例模拟分析不同来流速度时悬浮隧道周围的水动力特性,以耳形断面为例分析不同迎流面宽度时悬浮隧道周围的水动力特性。模拟结果表明:耳形截面形式悬浮隧道周围压力大,稳定性好,所受升力和阻力较小,是最合理的截面形式;随来流速度的增加,悬浮隧道周围压力显著增加,升力和阻力急剧增加;迎流面宽度对悬浮隧道周围压力场分布影响很小,对结构升力和阻力影响明显。In order to study the reasonable cross section design of submerged floating tunnel（SFT）,this paper adopted the large eddy simulation method,analyzed the SFT circumferential steady-state pressure distribution,fluid lift and drag force with five cross sections including circle,ellipse,ear-shaped,hexagonal,square based on Japan Spitfire Bay sea conditions.This paper simulated hydrodynamic characteristics of SFT with different flow speed by taking the circle cross section for example,and analyzed the hydrodynamic characteristics of SFT with different cross section height by taking the ear-shaped cross section for example.The simulation results showed that SFT with ear-shaped cross section has large ambient pressure,good stability,and suffers a smaller lift and drag force,which is the most reasonable cross-section form,SFT ambient pressure increases with flow speed increasing,lift and drag force also ascends dramatically,cross section height has little effect on SFT circumferential pressure distribution while has a greater effect on structure lift and drag force.

关 键 词：悬浮隧道 大涡模拟 周向压强分布 截面设计 

分 类 号：U452.25[建筑科学—桥梁与隧道工程] TV135[交通运输工程—道路与铁道工程]