發(fā)布時間：2018-01-28 11:41

  本文關(guān)鍵詞： 地鐵盾構(gòu) 管片接頭 火災(zāi)高溫 可靠度分析　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：隨著國內(nèi)地鐵的快速發(fā)展,盾構(gòu)隧道建設(shè)項目也逐漸增多。伴隨而來的安全問題,尤其是火災(zāi)下盾構(gòu)隧道的結(jié)構(gòu)安全,成為了現(xiàn)有關(guān)注的熱點之一。盾構(gòu)隧道是由管片通過接頭拼裝而成的,一旦發(fā)生火災(zāi),不僅管片構(gòu)件會發(fā)生損傷,作為薄弱環(huán)節(jié)的接縫結(jié)構(gòu)在高溫下的受力特性,其也將對隧道結(jié)構(gòu)安全造成極大的損害；同時,接縫結(jié)構(gòu)是隧道防水的關(guān)鍵,其高溫下的災(zāi)變行為,如接縫變形過大導(dǎo)致漏水等,將極大的影響盾構(gòu)隧道的使用功能�？梢�,如何確定高溫下盾構(gòu)隧道接縫結(jié)構(gòu)的受力特性,并以此為依據(jù)評估其安全性及可靠性,是未來盾構(gòu)隧道火災(zāi)評估的關(guān)鍵。因此本文針對高溫下盾構(gòu)隧道接縫結(jié)構(gòu)受力特性進行以下研究： 1.建立接頭結(jié)構(gòu)三維數(shù)值模型,確定火災(zāi)下接縫結(jié)構(gòu)的溫度分布規(guī)律,重點研究高溫下手孔局部及連接螺栓的升溫歷程；揭示不同軸力、偏心距荷載組合下的接縫結(jié)構(gòu)張開量變化規(guī)律；探究高溫作用過程中螺栓與混凝土結(jié)構(gòu)的應(yīng)力應(yīng)變變化規(guī)律,并分析接縫結(jié)構(gòu)受壓區(qū)高度變化規(guī)律。 2.基于接頭結(jié)構(gòu)常溫受力模型,考慮接縫結(jié)構(gòu)襯墊的影響,結(jié)合數(shù)值模擬結(jié)果,分析了接縫在裝配-正常運營-火災(zāi)高溫全過程下的力學(xué)行為和變形機理；建立了高溫下接頭結(jié)構(gòu)受力模型,制定高溫下接縫結(jié)構(gòu)接頭剛度理論計算方法,并根據(jù)數(shù)值模擬給出的溫度場結(jié)果進行計算,進而與數(shù)值模擬結(jié)果進行對比分析,驗證理論算法的可行性。 3.基于接縫結(jié)構(gòu)在火災(zāi)高溫下的力學(xué)模型,分析盾構(gòu)隧道接縫結(jié)構(gòu)高溫失效模式,給出火災(zāi)高溫下接頭結(jié)構(gòu)的失效功能函數(shù),并以此為依據(jù)結(jié)合驗算點法計算襯墊厚度、螺栓位置、襯砌厚度等不同參數(shù)對接縫結(jié)構(gòu)可靠度的影響規(guī)律；結(jié)合可靠度分析及數(shù)值模擬結(jié)果,給出了相應(yīng)的地鐵盾構(gòu)隧道接縫防火建議。
[Abstract]:Absrtact: with the rapid development of subway in China, the construction project of shield tunnel is increasing gradually. The safety problems come with it, especially the structural safety of shield tunnel under fire. Shield tunneling is made up of segments assembled by joints. Once fire occurs, not only segment members will be damaged. As a weak link, the mechanical characteristics of jointed structure under high temperature will also cause great damage to the safety of tunnel structure. At the same time, joint structure is the key of tunnel waterproofing, its catastrophic behavior under high temperature, such as joint deformation too large lead to water leakage, will greatly affect the use of shield tunnel function. How to determine the mechanical characteristics of shield tunnel joint structure under high temperature and evaluate its safety and reliability. It is the key to fire assessment of shield tunnel in the future. Therefore, the stress characteristics of joint structure of shield tunnel under high temperature are studied as follows: 1. To establish a three-dimensional numerical model of joint structure, determine the temperature distribution of joint structure under fire, and focus on the temperature rise process of high temperature underhole and joint bolt; The variation law of opening quantity of joint structure under different axial force and eccentricity load combination is revealed. The variation of stress and strain of bolt and concrete structure under high temperature is studied, and the variation law of height in compression zone of jointed structure is analyzed. 2. Based on the stress model of joint structure at room temperature, considering the influence of the gasket of joint structure, combined with the numerical simulation results, the mechanical behavior and deformation mechanism of joint in the whole process of assembly, normal operation and fire high temperature are analyzed. The stress model of joint structure under high temperature is established, and the theoretical calculation method of joint stiffness of joint structure at high temperature is established, and the results of temperature field are calculated according to the numerical simulation. And then compared with the numerical simulation results to verify the feasibility of the theoretical algorithm. 3. Based on the mechanical model of joint structure under high temperature, the failure mode of shield tunnel joint structure at high temperature is analyzed, and the failure function function of joint structure under fire high temperature is given. On the basis of this, the reliability of butt joint structure of different parameters, such as cushion thickness, bolt position, lining thickness and so on, is calculated based on checking point method. Combined with reliability analysis and numerical simulation results, the corresponding fire prevention suggestions of shield tunnel joint are given.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451;U455.43

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