考虑初衬作用的大跨储水隧洞二衬结构模型及分析

应用荷载结构法分析隧洞复合式衬砌结构的二衬结构内力时,以承载比的概念考虑初衬作用.承载比大多以经验为主,可靠性不高.对于大跨隧洞,采用全荷载计算模型(二衬承受全部围岩荷载)为主分析二衬内力,分析结果偏于保守.本文通过对隧洞初衬、二衬之间相互作用原理的分析,提出考虑初衬作用的二衬结构分析模型.文中对二衬全荷载分析模型和考...

Model and Analysis of Secondary Lining Structure of Long-span Water Storage Tunnels Considering the Influence of Initial Lining

When the load structure method is used to analyze the stress in the secondary lining structure of the tunnel composite lining structure,the initial lining effect is considered with the concept of bearing ratio.The bearing ratio is mainly based on experience and the reliability is not high.For the long-span tunnels,the full load calculation model in which the secondary lining bears all surrounding rock loads is used to analyze the stress of the second lining,and the analysis results are conservative.In this paper,a full load structural model and analysis of the secondary lining considering the influence of the initial lining is presented based on the principle of interaction between the initial lining and the secondary lining.The results show that when the influence of the initial lining on the secondary lining is considered,the initial lining has varying degrees of load-sharing effect on the axial force,bending moment and shear force,and has the most share effect on axial force.Therefore,as the most direct calculation and analysis method of the tunnel secondary lining considering the influence of the initial lining,this study can be used as a reference for the design of the tunnel secondary lining.