中国铁道科学2017，Vol.38Issue(6)：56-62,7.DOI:10.3969/j.issn.1001-4632.2017.06.08
高速铁路隧道拱顶二次衬砌背后存在空洞时气动荷载对其的影响
Influence of Aerodynamic Load on Secondary Lining of High Speed Railway Tunnel with Cavity behind Vault Lining
摘要
Abstract
In order to explore the influence of the aerodynamic load of high speed train on the secondary lining structure of tunnel within different ranges with cavities behind the secondary lining of tunnel vault,the fluid mechanics analysis method of tunnel aerodynamics together with structural mechanics analysis method were adopted to study the stress of secondary lining structure.Results show that the secondary lining structure is in the cyclic stress state of "tension and compression" under the action of aerodynamic load.When there are cavities behind the secondary lining of tunnel vault,the variation of transient stress produced on lining structure is consistent with that of the aerodynamic load.When the train speed is 350 km · h-1,the maximum transient stress produced on secondary lining structure is about 39 times as much as that of aerodynamic load at the same time.Under the maximum positive peak aerodynamic load,with the increase of the cavity range behind the secondary lining of tunnel vault,the range of tensile stress decreases gradually,and the tensile stress value increases first and then decreases.Under the maximum negative peak aerodynamic load,the first principal stress of secondary lining only has compressive stress without tensile stress.With the increase of the cavity range behind the secondary lining of tunnel vault,the range of compressive stress decreases gradually,and the compressive stress value increases first and then decreases.The absolute value of the maximum stress produced on secondary lining structure increases with the increase of train speed,and has a quadratic function relationship with the square of train speed.关键词
高速铁路隧道/气动荷载/二次衬砌/结构应力/空洞Key words
High speed railway tunnel/Aerodynamic load/Secondary lining/Structural stress/Cavity分类
交通工程引用本文复制引用
季维生..高速铁路隧道拱顶二次衬砌背后存在空洞时气动荷载对其的影响[J].中国铁道科学,2017,38(6):56-62,7.基金项目
国家自然科学基金资助项目(51678036) （51678036）
