横江流域水库蓄水对库区隧道安全的影响评价

发布时间：2018-06-26 09:41

本文选题：水库蓄水 + 隧道安全　；参考：《西南交通大学》2014年硕士论文

【摘要】：隧道是赋存于天然介质中的人工地下结构,受到外部环境因素的影响,隧道在后期运营过程中出现病害,如翻浆冒泡和衬砌破坏等。水库蓄水导致了库岸隧道水文地质环境的改变,在某些条件下会对隧道运营安全产生影响。本文依托横江梯级电站水库蓄水对内昆铁路安全影响的评估、防治工程设计项目,结合岩体力学、结构力学、水文地质、工程地质、土力学等多学科进行综合分析,对水库蓄水后对隧道安全的影响进行了系统评价。调查研究了横江流域区域地质环境和各梯级电站工程地质条件,分析了水库蓄水后水文地质变化特征、隧道围岩对水的敏感性及水岩相互作用。结合内昆线各隧道勘察设计资料、库区正常蓄水位及现场踏勘资料,评价了水库蓄水对各个隧道的安全影响,剔除水库蓄水后无影响或影响不大的隧道,筛选出有较大影响的4座隧道。以麻石山隧道为例进行隧道安全性数值模拟。通过研究水库蓄水前和蓄水后隧道二次衬砌内力和安全系数的升降变化幅度,分析了水库蓄水对麻石山隧道安全性的具体影响,为隧道结构加固或库岸防护提供了依据。归纳总结了水库蓄水导致的各种工程地质问题,提出了隧道病害的分类,初步研究了水库蓄水诱发的隧道病害的机理,对隧道病害提出了相应的工程措施。
[Abstract]:Tunnel is an artificial underground structure existing in natural medium, which is affected by external environmental factors. During the later operation of tunnel, there are diseases, such as slurry bubbling and lining damage. The reservoir impoundment results in the change of the hydrogeological environment of the reservoir bank tunnel, which will affect the safety of the tunnel operation under some conditions. Based on the evaluation of the impact of reservoir water storage on the safety of Nei-Kun Railway in Hengjiang Cascade Hydropower Station, the design project of prevention and control engineering, combined with rock mechanics, structural mechanics, hydrogeology, engineering geology, soil mechanics and so on, is comprehensively analyzed. The influence of reservoir water storage on tunnel safety is systematically evaluated. The regional geological environment of Hengjiang River basin and the engineering geological conditions of each cascade power station are investigated and studied. The characteristics of hydrogeological changes after reservoir storage, the sensitivity of tunnel surrounding rock to water and the interaction between water and rock are analyzed. Combined with the survey and design data of each tunnel in Nei-Kun Line, the normal water level of reservoir area and the site survey data, the safety effect of reservoir water storage on each tunnel is evaluated, and the tunnels without any or no influence after reservoir impoundment are excluded. Four tunnels with great influence were screened out. The numerical simulation of tunnel safety is carried out with Maishishan tunnel as an example. By studying the variation range of the secondary lining internal force and safety factor before and after the reservoir impoundment, the concrete influence of reservoir water storage on the safety of Mashishan tunnel is analyzed, which provides the basis for the reinforcement of tunnel structure or the protection of reservoir bank. Various engineering geological problems caused by reservoir impoundment are summarized, the classification of tunnel diseases is put forward, the mechanism of tunnel diseases induced by reservoir impoundment is preliminarily studied, and the corresponding engineering measures for tunnel diseases are put forward.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV697;U458

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