重载铁路隧道底部结构服役性能演化机制与设计方法研究

项目名称： 重载铁路隧道底部结构服役性能演化机制与设计方法研究

项目编号： No.51278494

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 施成华

作者单位： 中南大学

项目金额： 80万元

中文摘要： 目前国内外关于重载对隧道的影响研究尚属初步，在工程设计、施工上缺乏指导性理论。本项目针对我国重载铁路隧道建设的迫切需要，通过系统深入的理论和试验研究，确定重载列车荷载、地下水和地应力叠加条件下隧道底部结构的受力和变形特征，分析施工不当引起缺陷状态下隧道底部结构的应力、应变重分布规律，揭示列车动载-地下水-初始损伤耦合作用下隧道底部结构的渐进累积损伤破坏机理，构建隧道底部混凝土结构及基岩的非线性累积损伤分析模型，分析初始损伤对隧道底部结构服役性能的影响情况，确定重载铁路隧道底部结构的合理结构型式、设计参数以及满足重载列车长期运营安全的隧道基底结构技术条件，建立基于全寿命的重载铁路隧道底部结构的设计计算方法。研究成果对我国新建重载铁路隧道底部结构的设计，既有重载铁路隧道底部病害的整治以及重载铁路隧道底部结构体系全寿命安全性的评估和控制都具有重要意义。

中文关键词： 重载铁路隧道；底部结构；累积损伤；一体化模型；设计方法

英文摘要： At present, The research on the effect of heavy haul on tunnel is still in the initial stage both at home and abroad, it is lack of guidance theory in the heavy haul tunnel design and construction. The project aims at the urgent need of construction of heavy haul railway tunnel in our country. Based on the systematic and deep research, the stress and deformation characteristics of tunnel bottom structures will be determined in the stack conditions of heavy train load，groundwater and strata stress; the redistribution law of stress and strain of tunnel bottom structure will be analyzed under the state of constructional deficiency; the gradual cumulative damage failure mechanism will be revealed on the coupling among dynamic load, groundwater and initial damage; the nonlinear cumulative damage analysis model of the tunnel concrete structure and the bottom of bedrock will be built and the influence of initial damage will be analyzed on tunnel bottom structure service performance. The reasonable structure forms, design parameters and tunnel bottom structure technical conditions of heavy haul railway tunnel bottom structures which meeting the long-term operation safety will be ensured. The design calculation method based on whole life of heavy haul railway tunnel bottom structure will be established. The research resu

英文关键词： Heavy haul railway tunnel；bottom structure；cumulative damage；integrated numerical simulation model；design method