【摘要】：沉管隧道因其現(xiàn)場(chǎng)施工工期短且不妨礙航運(yùn)等特點(diǎn)越來越多的在跨江跨海工程中使用。我國(guó)沉管法施工近幾年來逐漸得到重視，發(fā)展迅速。沉管節(jié)段接頭是沉管隧道即薄弱又關(guān)鍵的位置，節(jié)段接頭剪力鍵作為連接沉管管節(jié)節(jié)段的重要手段，剪力鍵的深入研究必然對(duì)節(jié)段接頭安全性具有重要意義，同時(shí)在抵抗剪力作用過程中各剪力鍵各自承擔(dān)比重尚未研究，明確節(jié)段接頭剪力鍵承擔(dān)比可以為剪力鍵設(shè)計(jì)提供指導(dǎo)幫助。本文以港珠澳沉管隧道為工程背景，在其特定的工程背景下進(jìn)行剪力鍵應(yīng)力與地基沉降量之間關(guān)系探討和節(jié)段接頭剪力鍵剪力承擔(dān)比研究。 本文主要研究?jī)?nèi)容如下： 1）建立實(shí)際工程沉管尺寸有限元模型，模擬可能出現(xiàn)的四種工況，確定剪力鍵受力最不利工況，，以此作為物理試驗(yàn)研究工況。 2）確定物理模型試驗(yàn)?zāi)Ｐ拖嗨票�、相似判�?jù)，檢驗(yàn)裝配式剪力鍵方案可行性。 3）建立物理模型試驗(yàn)有限元模型，對(duì)其數(shù)值結(jié)果與物理試驗(yàn)測(cè)試結(jié)果進(jìn)行對(duì)比，論證物理模型試驗(yàn)有限元模型可靠性。 4）描述解釋物理模型試驗(yàn)剪力鍵破壞特征，總結(jié)剪力鍵應(yīng)力與地基沉降量之間關(guān)系，確定節(jié)段接頭剪力鍵建立承擔(dān)比。
[Abstract]:Sinking pipe tunnel is more and more used in cross-river and sea-crossing projects because of its short site construction period and without hindering shipping. In recent years, the construction of sinking pipe method in China has been paid more and more attention and developed rapidly. The sinking pipe segment joint is the weak and key position of the sinking pipe tunnel. The shear key of the segment joint is an important means to connect the sinking pipe segment, and the in-depth study of the shear key is bound to be of great significance to the safety of the segment joint. At the same time, in the process of resisting shear force, the specific gravity of each shear key has not yet been studied, and the clear shear key bearing ratio of segmental joint can provide guidance and help for the design of shear key. In this paper, the relationship between shear bond stress and foundation settlement and the shear bond shear load ratio of segmental joints are studied under the specific engineering background of Hong Kong-Zhuhai-Macao immersed pipe tunnel. The main contents of this paper are as follows: 1) the finite element model of sinking pipe size in practical engineering is established, four possible working conditions are simulated, and the most unfavorable conditions of shear bond force are determined, which is used as the research condition of physical test. 2) to determine the similarity ratio and similarity criterion of the physical model test model, and to test the feasibility of the assembled shear key scheme. 3) the finite element model of physical model test is established, and the numerical results are compared with those of physical test, and the reliability of finite element model of physical model test is demonstrated. 4) describe and explain the failure characteristics of shear keys in physical model tests, summarize the relationship between shear bond stress and foundation settlement, and determine the bearing ratio of shear keys in segmental joints.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U452.11;U455.49

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