本文選題：沉管隧道　切入點(diǎn)：火災(zāi)　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：港珠澳大橋工程是我國首座涉“兩岸三地”的世界超級(jí)工程，主體工程包括一座跨越伶仃洋航道的海底沉管隧道，是目前世界上最長（5664m）、埋深最深（50m）、規(guī)模最大（雙向六車道）、單節(jié)管節(jié)最重（75000T）的海底沉管隧道，也是我國交通建設(shè)史上技術(shù)最復(fù)雜、標(biāo)準(zhǔn)最高的海中隧道工程，設(shè)計(jì)施工難度在世界范圍內(nèi)首屈一指。 港珠澳海底沉管隧道位于水下海床基槽上，結(jié)構(gòu)橫向?yàn)閮煽滓还芾葐螌右r砌，縱向?yàn)楣芄?jié)+復(fù)合接頭的串聯(lián)式復(fù)合體，這些特殊的外部條件與內(nèi)部構(gòu)造形式對(duì)運(yùn)營中出現(xiàn)的火災(zāi)更為敏感。一旦發(fā)生火災(zāi)，管節(jié)結(jié)構(gòu)與接頭均會(huì)發(fā)生損傷，破壞時(shí)難以修復(fù)，對(duì)結(jié)構(gòu)防水與安全健康服役影響巨大�；诖耍疚囊劳懈壑榘拇髽蚬こ�，針對(duì)沉管隧道火災(zāi)場(chǎng)景設(shè)計(jì)、管節(jié)結(jié)構(gòu)三維溫度場(chǎng)、管節(jié)結(jié)構(gòu)與接頭高溫應(yīng)力及損傷等方面展開研究，具體內(nèi)容如下： ①港珠澳沉管隧道火災(zāi)場(chǎng)景 基于沉管隧道的斷面特點(diǎn)，通過1:1足尺寸火災(zāi)實(shí)驗(yàn)及其數(shù)據(jù)分析，在參考公路隧道火災(zāi)場(chǎng)景的基礎(chǔ)上，建立了隨時(shí)間、空間變化的港珠澳海底沉管隧道的完整火災(zāi)場(chǎng)景。 ②沉管隧道管節(jié)結(jié)構(gòu)溫度場(chǎng)分布規(guī)律 通過建立火災(zāi)溫度場(chǎng)三維數(shù)值模型，，考慮了不同溫度級(jí)別（600℃、900℃、1200℃）以及RABT等四種火災(zāi)曲線情況，得到了沉管隧道結(jié)構(gòu)內(nèi)部的溫度傳播與分布規(guī)律。探討了玻鎂防火板對(duì)于管節(jié)結(jié)構(gòu)的隔熱效果，研究結(jié)果表明半斷面布設(shè)防火板的方案能夠滿足耐火要求。 ③高溫作用下管節(jié)結(jié)構(gòu)力學(xué)行為 在考慮管節(jié)（段）之間的接觸關(guān)系的基礎(chǔ)上，通過建立有（無）隔熱條件下沉管隧道三維熱力耦合模型，得到了兩種條件下管節(jié)與節(jié)段的位移、應(yīng)力分布規(guī)律及損傷深度，并且針對(duì)管節(jié)接頭的幾何特點(diǎn)，找到了最大損傷深度位置的規(guī)律。 ④高溫作用下接頭力學(xué)行為 通過建立有（無）隔熱條件下沉管隧道管節(jié)、節(jié)段接頭分析模型，包括管節(jié)接頭GINA止水帶及兩種接頭處的傳力剪力鍵，得到了不同升溫曲線下管節(jié)接頭的變形及兩種接頭的剪力變化規(guī)律，并通過計(jì)算論證指出了著火側(cè)內(nèi)墻及頂板位置剪力鍵受火災(zāi)高溫影響較大。
[Abstract]:The Hong Kong-Zhuhai-Macao Bridge project is the first world superproject involving "the two sides of the strait and three places" in China. The main project includes a submersible tunnel across the Lingdingyang waterway. At present, it is the longest undersea tunnel in the world, with the deepest depth of 50m, and the largest scale (two-way six-lane tunnel, single pipe section with the heaviest weight of 75000T). It is also the most technologically complex and standard tunnel project in the history of transportation construction in China. The difficulty of design and construction is second to none in the world. Hong Kong-Zhuhai-Macao undersea sinking tunnel is located on the foundation of underwater seabed. The structure of the tunnel is a series compound with two holes and a pipe corridor single layer lining and a pipe joint in the longitudinal direction. These special external conditions and internal structures are more sensitive to fires in operation. In the event of fire, both the pipe structure and the joints are damaged, which is difficult to repair. Based on the waterproofing and safe and healthy service of the structure, this paper, based on the HongKong-Zhuhai-Macao Bridge project, aims at the fire scene design of the immersed tunnel and the three-dimensional temperature field of the pipe segment structure. The high temperature stress and damage of pipe joints and joints are studied. The details are as follows:. 1 Fire scene of Hong Kong Zhuhai-Macau immersed Tunnel. Based on the cross section characteristics of immersed tube tunnel, based on the 1: 1 full-size fire experiment and its data analysis, and referring to the fire scene of highway tunnel, the complete fire scene of Hong Kong-Zhuhai-Macao undersea immersed tunnel with time and space variation is established. Temperature field distribution law of pipe joint structure in 2-submersible tunnel. By establishing a three dimensional numerical model of fire temperature field, four kinds of fire curves, such as 600 鈩

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