黄土沟壑地形桥梁下部结构运营期间风险演变规律与管理方法

发布时间：2018-04-26 05:34

本文选题：桥梁灾害 + 熵理论　；参考：《长安大学》2015年硕士论文

【摘要】：随着现代化建设的飞速发展,我国桥梁建设得到了前所未有的发展契机。现阶段的西北山区桥梁,往往重视施工阶段的安全性和经济性,而桥梁在运营期间所出现的各种问题并没有得到应有的关注。黄土沟壑地形桥梁下部结构在运营期间所暴露出的各种问题,如桩基外露、桩周土体塌陷和流失,桥面集中排水和降雨对桩基造成的冲刷,桥台搭板掏空、锥坡沉陷等问题,由于山区桥梁运营期间所出现的灾害没有得到有效的关注和解决,桥梁在出现运营安全风险后,往往会造成巨大金额的维护费用。论文在借鉴国内外研究成果的基础上,对西北黄土地区桥梁下部结构进行广泛的调研,并借助于熵理论对建设在黄土沟壑地形桥梁下部结构的风险进行风险演变规律分析,在此基础上作出管理方法的探讨。论文主要研究内容如下:首先,对西北黄土沟壑地形梁桥下部结构运营期间出现的各种灾害进行广泛的调研,对常见病害做系统的归类,然后深入分析了病害的成因和灾害的特点,在此基础上建立起黄土沟壑地形桥梁下部结构运营期间的风险系统,并对风险系统的特征和动力机制进行分析。其次,在病害调研和风险系统特征和动力机制分析的基础上运用熵理论建立黄土沟壑地形桥梁下部结构运营期间的风险演变规律研究方法。最后,在风险演变规律研究的基础上,提出适应于黄土沟壑地形桥梁下部结构多层次的防护策略,提高桥梁的安全性能及运营水平。开展黄土沟壑地形桥梁下部结构运营期间风险演变规律与防护管理的研究是十分必要的,论文的研究成果将对我国西北地区山区现有高速公路典型混凝土桥梁的安全运营与管理具有重要的指导意义,同时对未来山区高速公路桥梁的规划设计具有借鉴与指导作用。
[Abstract]:With the rapid development of modernization, the bridge construction in our country has got an unprecedented development opportunity. At present, the bridge in the northwest mountainous area often attaches importance to the safety and economy of the construction stage, but the problems of the bridge in the period of operation have not received due attention. During the operation of loess gully topographic bridge substructure, various problems are exposed, such as pile foundation exposure, soil collapse and loss around pile, scour caused by concentrated drainage of bridge deck and rainfall on pile foundation, bridge abutment slab cutting, conical slope subsidence, etc. Because the disasters occurred during the operation of bridges in mountainous areas have not been paid attention to and solved effectively, the bridge often causes huge maintenance costs after the operation safety risks occur. Based on the research results at home and abroad, this paper makes an extensive investigation on the substructure of the bridge in the loess region of northwest China, and analyzes the risk evolution law of the bridge substructure in loess gully terrain by means of entropy theory. On this basis, the management method is discussed. The main contents of this paper are as follows: firstly, a wide range of disasters occurred during the operation of the substructure of the loess gully bridge in Northwest China are investigated, and the common diseases are systematically classified. Then, the causes of the disease and the characteristics of disasters are analyzed in depth. On this basis, the risk system of loess gully terrain bridge during the operation period is established, and the characteristics and dynamic mechanism of the risk system are analyzed. Secondly, on the basis of disease investigation, risk system characteristics and dynamic mechanism analysis, the study method of risk evolution law during the operation of loess gully terrain bridge is established by using entropy theory. Finally, based on the study of the risk evolution law, a multi-level protection strategy is proposed to improve the safety performance and operation level of the bridge in loess gully terrain. It is necessary to study the risk evolution law and protection management during the operation of loess gully topographic bridge. The research results of this paper will have important guiding significance for the safety operation and management of the existing typical concrete bridges of expressway in the mountainous areas of northwest China, and it will also be useful for the planning and design of highway bridges in the mountainous areas in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U447

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