本文選題：盾構(gòu)隧道 + 錯(cuò)縫拼裝��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：針對(duì)目前盾構(gòu)隧道下穿既有鐵路工程越來(lái)越多,高鐵車(chē)致動(dòng)載對(duì)下穿盾構(gòu)結(jié)構(gòu)的影響日益凸顯。本文運(yùn)用數(shù)值模擬的動(dòng)力計(jì)算方法,旨在研究車(chē)致動(dòng)載對(duì)下方盾構(gòu)管片的動(dòng)力影響,主要內(nèi)容如下:1)采用錯(cuò)縫拼裝管片的精細(xì)化模型做動(dòng)力計(jì)算,為較好地模擬無(wú)限巖土體,建立有限元—無(wú)限元耦合計(jì)算模型,基于無(wú)限元單元的定義規(guī)則,采用MATLAB程序化批量處理修改無(wú)限元單元,極大地提高了計(jì)算效率。2)分析得出下穿盾構(gòu)區(qū)間的動(dòng)應(yīng)力響應(yīng)規(guī)律,明確了結(jié)構(gòu)受車(chē)致動(dòng)載的危險(xiǎn)部位。與均質(zhì)圓環(huán)模型對(duì)比分析,得出管片錯(cuò)縫拼裝的計(jì)算模型可以更好地模擬實(shí)際工程中螺栓的受力與錯(cuò)縫拼裝對(duì)管片的作用。3)研究了車(chē)致動(dòng)載對(duì)下穿盾構(gòu)地層的衰減規(guī)律,通過(guò)非線性擬合得出應(yīng)力沿地層深度變化曲線公式。與目前常用的擬靜力法作對(duì)比分析,可以看出相比于動(dòng)力計(jì)算法有30%至45%的安全儲(chǔ)備,是一種偏保守的通用設(shè)計(jì)方法。4)建立不同埋深工況的錯(cuò)縫拼裝模型,分析了不同工況下各分析點(diǎn)管片與螺栓的應(yīng)力響應(yīng)規(guī)律。管片所受總應(yīng)力由隧道初始應(yīng)力與車(chē)致荷載動(dòng)應(yīng)力共同影響,由于二者分別隨著埋深增加而增大和減小,因此隨著埋深的變化,二者對(duì)各分析點(diǎn)影響的比重不同,總的應(yīng)力變化趨勢(shì)也有所不同。5)比較分析了兩種MJS加固方式的應(yīng)力變化規(guī)律,得出MJS加固方式對(duì)模擬施工開(kāi)挖的初始應(yīng)力影響遠(yuǎn)遠(yuǎn)大于車(chē)致荷載對(duì)管片的動(dòng)應(yīng)力影響。6)基于車(chē)致荷載下各工況的應(yīng)力水平,通過(guò)結(jié)構(gòu)疲勞壽命預(yù)測(cè)公式,得到各工況下的疲勞壽命,總結(jié)得出了不同埋深下管片疲勞壽命的影響規(guī)律。
[Abstract]:At present, there are more and more existing railway projects under the shield tunnel, and the influence of the moving load of the high-speed train on the structure of the shield tunneling is becoming more and more prominent. In this paper, the dynamic calculation method of numerical simulation is used to study the dynamic effect of vehicle driving load on the bottom shield segment. The main contents are as follows: 1) dynamic calculation is done by using the refined model of staggered joint assembly segment, in order to simulate the infinite rock and soil better. Based on the definition rules of infinite element, the finite element coupling model is established, and the infinite element is modified by MATLAB program batch processing. The calculation efficiency is greatly improved by .2) the law of dynamic stress response in the interval of shield tunneling is obtained by the analysis of the finite element and infinite element coupling model, which is based on the definition rule of infinite element. The dangerous part of the structure subjected to the moving load of the vehicle is identified. Compared with the homogeneous ring model, it is concluded that the calculation model of segment disjoint assembly can better simulate the force of bolt and the action of staggered joint assembly on segment in practical engineering. 3) the attenuation law of vehicle driving load on underpass shield formation is studied. The formula of stress variation curve along formation depth is obtained by nonlinear fitting. Comparing with the pseudostatic method, it can be seen that there is a 30% to 45% safety reserve compared with the dynamic calculation method, and it is a conservative general design method .4) to establish the fault joint assembly model with different buried depth working conditions. The stress response of segments and bolts at different analysis points under different working conditions is analyzed. The total stress of the segment is influenced by both the initial stress of tunnel and the dynamic stress of vehicle-induced load. Because they increase and decrease with the increase of burying depth, the proportion of influence of them on each analysis point is different with the change of buried depth. The trend of total stress change is different from that of 5. 5) the stress variation law of two kinds of MJS reinforcement methods is compared and analyzed. It is concluded that the effect of MJS reinforcement on the initial stress of simulated construction excavation is much greater than that on segment dynamic stress by vehicle-induced load (.6). Based on the stress level of each working condition under vehicle-induced load, the fatigue life prediction formula of structure is obtained. The fatigue life under different working conditions is obtained, and the influence of different buried depth on fatigue life of pipe is summarized.
【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】：2017
【分類號(hào)】：U455.43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蔣紅光;邊學(xué)成;陳云敏;蔣建群;;高速鐵路軌道-路基列車(chē)移動(dòng)荷載模擬的全比尺加速加載試驗(yàn)[J];土木工程學(xué)報(bào);2015年09期

2 郭瑞;何川;封坤;唐銳;;弱抗力地層盾構(gòu)隧道失穩(wěn)破壞的模型試驗(yàn)研究[J];鐵道學(xué)報(bào);2015年03期

3 董新平;;盾構(gòu)襯砌整環(huán)破壞機(jī)理研究[J];巖土工程學(xué)報(bào);2014年03期

4 封坤;何川;蘇宗賢;;南京長(zhǎng)江隧道原型管片結(jié)構(gòu)破壞試驗(yàn)研究[J];西南交通大學(xué)學(xué)報(bào);2011年04期

5 徐干成;李成學(xué);王后裕;趙月;胡萍;;地鐵盾構(gòu)隧道下穿京津城際高速鐵路影響分析[J];巖土力學(xué);2009年S2期

6 董亮;趙成剛;蔡德鉤;張千里;葉陽(yáng)升;;高速鐵路無(wú)砟軌道路基動(dòng)力特性數(shù)值模擬和試驗(yàn)研究[J];土木工程學(xué)報(bào);2008年10期

7 莫海鴻;鄧飛皇;王軍輝;;營(yíng)運(yùn)期地鐵盾構(gòu)隧道動(dòng)力響應(yīng)分析[J];巖石力學(xué)與工程學(xué)報(bào);2006年S2期

8 陳俊生;莫海鴻;;盾構(gòu)隧道管片施工階段力學(xué)行為的三維有限元分析[J];巖石力學(xué)與工程學(xué)報(bào);2006年S2期

9 劉英城;;盾構(gòu)機(jī)穿越高速鐵路的施工[J];隧道建設(shè);2006年S2期

10 張海波,殷宗澤,朱俊高,李翠霞;盾構(gòu)法隧道襯砌施工階段受力特性的三維有限元模擬[J];巖土力學(xué);2005年06期

相關(guān)碩士學(xué)位論文 前2條

1 劉強(qiáng);列車(chē)荷載下地鐵管片及接頭動(dòng)力響應(yīng)及疲勞壽命研究[D];中南大學(xué);2014年

2 張飛進(jìn);盾構(gòu)施工穿越既有線地表沉降規(guī)律與施工參數(shù)優(yōu)化[D];北京工業(yè)大學(xué);2006年

，

本文編號(hào)：2086631