【摘要】：目前,高速列車的運(yùn)行安全已經(jīng)日益引起人們的高度關(guān)注,高速列車可能脫軌撞擊有較大彎道和坡道的盾構(gòu)隧道并導(dǎo)致隧道結(jié)構(gòu)破壞這一現(xiàn)實(shí)威脅已在我國(guó)高速鐵路建設(shè)背景下逐漸顯現(xiàn),有鑒于此,對(duì)于撞擊荷載下盾構(gòu)隧道襯砌的安全和穩(wěn)定性評(píng)價(jià)顯得尤為重要,本文建立了考慮動(dòng)力邊界條件、管片實(shí)體接頭、管片三維接觸、管片襯砌非線性開裂與接頭螺栓非線性開裂的耦合模型,以此研究撞擊荷載下盾構(gòu)隧道襯砌的開裂力學(xué)行為,以及螺栓接頭的動(dòng)力響應(yīng),得到如下主要研究成果：(1)闡述了混凝土裂縫分析中常用的開裂模型,研究對(duì)比了各種開裂模型的特點(diǎn)及適用范圍；選用基于擴(kuò)展有限元法的開裂模型研究動(dòng)態(tài)裂紋的擴(kuò)展,并闡述了擴(kuò)展有限法的基本理論,給出了擴(kuò)展有限元法的單元數(shù)值積分方案,介紹了擴(kuò)展有限元法在ABAQUS中的運(yùn)用,分析了裂縫初始判定準(zhǔn)則和擴(kuò)展準(zhǔn)則。(2)通過建立三維列車模型,獲得列車撞擊荷載特征曲線,提出了通過高斯多峰擬合的經(jīng)驗(yàn)公式；建立單層管片襯砌的開裂模型,捕捉動(dòng)態(tài)裂紋的擴(kuò)展路徑,研究了管片裂縫的產(chǎn)生區(qū)域、擴(kuò)展時(shí)間以及擴(kuò)展長(zhǎng)度,分析了裂縫開度時(shí)程分布特點(diǎn),揭示了管片接頭、撞擊位置與裂縫開展的關(guān)系；對(duì)比分析環(huán)向彎螺栓和縱向直螺栓的應(yīng)力、變形、速度、加速度等動(dòng)力響應(yīng)特性。(3)通過建立雙層襯砌盾構(gòu)隧道模型,研究二次襯砌在撞擊荷載下的開裂演化以及開度時(shí)程曲線,對(duì)比分析單、雙層兩種形式下的盾構(gòu)隧道管片襯砌的開裂力學(xué)行為以及接頭螺栓的動(dòng)力響應(yīng),揭示了撞擊荷載下二次襯砌對(duì)管片襯砌的保護(hù)作用以及在限制管片襯砌開裂所起作用。(4)基于單層管片襯砌開裂模型,對(duì)接頭螺栓施加非線性開裂,研究接頭螺栓處裂縫的開裂演化以及開度時(shí)程曲線,對(duì)比分析未引入螺栓開裂和引入螺栓開裂兩種形式下盾構(gòu)隧道管片襯砌的開裂力學(xué)行為,揭示螺栓開裂在管片襯砌動(dòng)力開裂所起的作用。
[Abstract]:At present, the running safety of high-speed trains has attracted more and more attention. The realistic threat that high-speed trains may derail and impact shield tunnels with larger bends and ramps and cause tunnel structure damage has gradually appeared in the context of high-speed railway construction in China. It is very important to evaluate the safety and stability of shield tunnel lining under impact load. The coupling model of segment lining nonlinear cracking and joint bolt nonlinear cracking is used to study the cracking mechanics behavior of shield tunnel lining under impact load and the dynamic response of bolt joint. The main research results are as follows: (1) the crack models commonly used in crack analysis of concrete are expounded, and the characteristics and applicable scope of various crack models are compared, and the crack model based on the extended finite element method is selected to study the dynamic crack propagation. The basic theory of extended finite element method (EFEM) is expounded, the element numerical integration scheme of EFEM is given, and the application of EFEM in ABAQUS is introduced. The initial criterion and expansion criterion of crack are analyzed. (2) the characteristic curve of train impact load is obtained by establishing 3D train model, and the empirical formula of Gao Si multi-peak fitting is put forward, and the cracking model of single-layer segment lining is established. The propagation path of dynamic crack is captured, the producing region, propagation time and length of crack are studied, the distribution characteristics of crack opening time history are analyzed, and the relationship between segment joint, impact position and crack development is revealed. The dynamic response characteristics of toroidal bending bolts and longitudinal straight bolts are compared and analyzed. (3) by establishing a double-layer shield tunnel model, the cracking evolution and opening time history curve of secondary lining under impact load are studied. The cracking mechanics behavior of shield tunnel segment lining and the dynamic response of joint bolt are compared and analyzed. The protective effect of secondary lining on segment lining and its role in limiting the cracking of segment lining under impact load are revealed. (4) based on the cracking model of single-layer segment lining, nonlinear cracking of joint bolts is applied. The crack evolution and opening time history curve of joint bolt are studied. The cracking mechanical behavior of shield tunnel segment lining under two forms of unintroduced bolt crack and lead bolt crack is compared and analyzed. The effect of bolt cracking on dynamic cracking of segment lining is revealed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U458;U451.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 谷音;劉晶波;杜義欣;;三維一致粘彈性人工邊界及等效粘彈性邊界單元[J];工程力學(xué);2007年12期

2 方修君;金峰;王進(jìn)廷;;用擴(kuò)展有限元方法模擬混凝土的復(fù)合型開裂過程[J];工程力學(xué);2007年S1期

3 董毓利,謝和平,趙鵬;受壓混凝土理想彈塑性損傷本構(gòu)模型[J];力學(xué)與實(shí)踐;1996年06期

4 馬懷發(fā),陳厚群,黎保琨;混凝土試件細(xì)觀結(jié)構(gòu)的數(shù)值模擬[J];水利學(xué)報(bào);2004年10期

5 董玉文;任青文;;重力壩水力劈裂分析的擴(kuò)展有限元法[J];水利學(xué)報(bào);2011年11期

6 向俊;龔凱;毛建紅;曾慶元;;高速列車運(yùn)行安全性與橋梁防撞墻受力分析[J];鐵道學(xué)報(bào);2011年12期

7 蘇宗賢;何川;;荷載-結(jié)構(gòu)模式的殼-彈簧-接觸模型[J];西南交通大學(xué)學(xué)報(bào);2007年03期

8 杜效鵠;段云嶺;王光綸;;用連續(xù)-非連續(xù)方法分析混凝土梁的破壞過程[J];巖石力學(xué)與工程學(xué)報(bào);2005年23期

相關(guān)碩士學(xué)位論文 前1條

1 吳蘭婷;盾構(gòu)隧道管片接頭力學(xué)行為的有限元分析[D];西南交通大學(xué);2005年

，

本文編號(hào)：2294032