浅埋隧道支护结构内力和变形计算分析

Calculation and Analysis of Internal Force and Deformation of Shallow-buried Tunnel Supporting Structure

浅埋隧道浇筑二衬时,对初衬临时支撑的压力较大,需要对隧道临时支撑结构进行设计。本文在经验的基础上,应用理论计算,结合PLAXIS数值计算对该结构进行计算分析。结果表明:该方案的稳定性、强度、抗剪、挠度等均能满足规范要求;二衬施加后,竖向支撑轴力增加较大,弯矩、剪力和侧向位移变化较小,可为类似工程的设计、施工提供参考。

When the secondary lining is poured in shallow tunnel,the pressure on the temporary support of the primary lining is larger,so it is necessary to design the temporary support structure of the tunnel.On the basis of experience,theoretical calculation and PLAXIS numerical calculation are used to analyze the structure.The results show that:the stability,strength,shear resistance and deflection of the scheme can meet the requirements of the specification.After the secondary lining is applied,the axial force of the vertical support increases greatly,while the bending moment,shear force and lateral displacement change little,which can provide reference for the design and construction of similar projects.