列车作用下东巨寺沟铁路隧道围岩动力反应分析

东巨寺沟铁路隧道选取试验段中实施湿喷工艺喷射聚丙烯纤维混凝土，作为支护结构，并作永久性支护结构，免除二次衬砌；为研究该隧道在列车作用下的动力响应，从土－结构相互作用模型出发，采用粘－弹性人工边界条件，建立隧道支护结构－围岩相互作用的动力分析模型，采用时程积分法研究了列车荷载对铁路隧道围岩和支护结构的动力作用，分析了列车荷载作用下由于轨道不平顺引起的动力响应，并对该隧道围岩的稳定性进行了分析。分析结果表明:在列车动力作用下，隧道围岩和支护结构变形微小，处于稳定状态。

Analysis on Dynamic Response of Surrounding Rock at Dongjusigou Railway Tunnel under Train Loading

The test section of Dongjusigou Railway Tunnel is selected to carry out wet-spraying process，i.e.spraying polypropylene fiber reinforced concrete is applied for the permanent support，and the secondary lining is avoided.In order to study the dynamic response of the tunnel under train loading，with the soil-structure interaction model and viscous-elastic artificial boundary condition，the dynamic analytical model of interaction between support structure of tunnel and surrounding rock is established so that dynamic action of train load against surrounding rock of railway tunnel and its support structure could be studied by means of time integration，as well as both the dynamic response of surrounding rock due to irregularity of track under train loading and its stability are analyzed.The results show that under dynamic train loading，deformation of tunnel surrounding rock and the support structure is small and stays in a stable state.