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  本文關鍵詞： 火災 盾構隧道 管片構件 可靠度 安全性　出處：《中南大學》2014年碩士論文　論文類型：學位論文

【摘要】：摘要：隨著我國城市軌道交通的發(fā)展,以及盾構修建技術的進步,越來越多交通的隧道都采用盾構法來修建。伴隨而來的安全問題也越來越受到人們的關注,隧道火災就是所關注的主要問題之一。以往的隧道火災案例表明火災不僅會造成重大的人員傷亡和財產(chǎn)損失,同時也會對隧道襯砌結構造成嚴重損害。盾構隧道主要由管片拼裝而成,火災會對管片造成嚴重損傷,導致管片結構承載力和安全性大大降低；加之盾構隧道在設計、修建、營運都存在著不確定性,如何準確定量的評價火災下盾構隧道管片結構的承載力和安全性,就成了盾構隧道結構抗火研究的重要問題。本文在前人研究的基礎上,以實際工程為背景,基于結構可靠性理論分析火災對管片構件的影響,主要的研究工作如下： (1)在國內(nèi)外火災試驗成果的基礎上,選取了火災升溫曲線、混凝土材料熱工參數(shù),再通過有限元軟件ABAQUS計算了管片結構的溫度場,并從材料高溫劣化的角度分析了管片截面的損傷規(guī)律。 (2)基于等效截面法,給出火災下管片截面的極限承載力隨受火時間的計算公式,并結合慣用法給出的盾構隧道管片內(nèi)力的計算公式,建立了火災下管片構件的功能函數(shù)。 (3)采用一次二階矩法,對火災下管片構件的可靠度進行了計算,分析了混凝土等級、鋼筋等級、盾構隧道埋深、覆土層重度等主要因素下管片構件的可靠度隨受火時間的變化規(guī)律。 (4)根據(jù)計算得到的管片構件可靠度隨受火時間的變化規(guī)律,評估了管片構件的安全性,并給出了火災后評估盾構隧道管片結構的可靠指標,以及管片結構抗火設計與防火建議。
[Abstract]:Abstract: with the development of urban rail transit and the progress of shield construction technology, more and more tunnels are built by shield tunneling. Tunnel fire is one of the main problems concerned. Past tunnel fire cases show that fire not only causes heavy casualties and property losses. At the same time, it will also cause serious damage to the lining structure of the tunnel. The shield tunnel is mainly composed of segments, and the fire will cause serious damage to the segments, which will lead to a great decrease in the bearing capacity and safety of the segment structure. In addition, the shield tunnel is being designed and built. There is uncertainty in operation. How to evaluate accurately and quantitatively the bearing capacity and safety of shield tunnel segment structure under fire is an important problem in the research of shield tunnel structure fire resistance. Based on the theory of structural reliability, the influence of fire on segment members is analyzed in the background of actual engineering. The main research work is as follows:. 1) on the basis of the fire test results at home and abroad, the fire heating curve and the thermal parameters of concrete are selected, and the temperature field of the segment structure is calculated by the finite element software ABAQUS. The damage law of the section is analyzed from the point of view of material degradation at high temperature. 2) based on the equivalent section method, the calculation formula of the ultimate bearing capacity of the section under fire with the time of fire is given, and the function function of the segment member under fire is established by combining the formula of the internal force of the shield tunnel segment given by the customary method. The reliability of segment members under fire is calculated by using the first-order second-order moment method, and the concrete grade, reinforcement grade and the buried depth of shield tunnel are analyzed. The variation rule of reliability of segment components with fire time under the main factors such as overburden depth and so on. 4) according to the rule that the reliability of segment member changes with the time of fire, the safety of segment member is evaluated, and the reliability index for evaluating the segment structure of shield tunnel after fire is given, as well as the fire resistance design and fire prevention suggestion of segment structure.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.43

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本文編號：1546190