發(fā)布時(shí)間：2018-04-04 10:29

  本文選題：擴(kuò)展有限元　切入點(diǎn)：裂縫形態(tài)　出處：《西南交通大學(xué)》2015年碩士論文

【摘要】：襯砌結(jié)構(gòu)破壞的不可預(yù)測(cè)性及嚴(yán)重破壞性一直是隧道工程界的瓶頸問(wèn)題。由于隧道病害中尤以隧道襯砌結(jié)構(gòu)開(kāi)裂最為常見(jiàn),且危害性極大,其產(chǎn)生和發(fā)展輕則引起隧道滲漏水,嚴(yán)重情況下會(huì)破壞隧道結(jié)構(gòu)的穩(wěn)定性,威脅行車(chē)安全,影響隧道乃至整個(gè)線路的安全運(yùn)營(yíng),引起巨大的經(jīng)濟(jì)損失。故本文旨在找到裂縫表觀特征與其產(chǎn)生原因之間的對(duì)應(yīng),即有效的根據(jù)表觀特征判斷可能的產(chǎn)生原因。主要工作如下：針對(duì)隧道襯砌結(jié)構(gòu),尤其是二次襯砌的開(kāi)裂情況,利用材料開(kāi)裂機(jī)理的分析和雙線鐵路隧道標(biāo)準(zhǔn)斷面參數(shù)的一個(gè)算例,對(duì)比分析擴(kuò)展有限元法和ANSYS模擬裂縫的方法,證明擴(kuò)展有限元法是相對(duì)合適的模擬辦法。其二,對(duì)已知的隧道襯砌結(jié)構(gòu)開(kāi)裂原因進(jìn)行了搜集和整理,采用其原因與力學(xué)相關(guān)與否進(jìn)行分類(lèi),并定性地給出了一些開(kāi)裂原因的判別標(biāo)準(zhǔn),最后確定了本文研究的主要病害因素。利用擴(kuò)展有限元方法(XFEM)進(jìn)行裂縫出現(xiàn)和開(kāi)展的數(shù)值模擬。由于擴(kuò)展有限元方法能較好地描述襯砌開(kāi)裂的走向、長(zhǎng)度等開(kāi)裂形態(tài)以及擴(kuò)展規(guī)律,故本文利用ABAQUS擴(kuò)展有限元就幾種常見(jiàn)的隧道病害進(jìn)行模擬,得出襯砌結(jié)構(gòu)在這些病害下的開(kāi)裂形態(tài)。這些隧道病害包括：各個(gè)位置上的襯砌背后空洞、混凝土減薄以及偏壓情況。而出現(xiàn)的裂縫形態(tài)分為縱向裂縫和環(huán)向裂縫,分布在二次襯砌上的相應(yīng)部位。數(shù)值模擬中一種病害原因往往得到一種開(kāi)裂狀態(tài),而不同的病害原因所導(dǎo)致的開(kāi)裂狀態(tài)有時(shí)會(huì)很類(lèi)似,所以如何初步地找到觀察得到的裂縫開(kāi)裂特征與其原因之間的對(duì)應(yīng)關(guān)系,是本文研究的重點(diǎn)。
[Abstract]:The lining structure damage unpredictability and serious destruction has been a bottleneck problem for the field of tunnel engineering. Due to tunnel diseases especially in tunnel lining cracking is the most common, and the harm, the emergence and development of light caused by the infiltration of Water Leakage tunnel, severe cases can damage the stability of tunnel structure, threat to traffic safety safe operation, and the influence of tunnel line, causing huge economic losses. Therefore, this paper aims to find the apparent crack characteristics and corresponding reasons, which effectively according to the apparent characteristic of possible causes. The main work is as follows: the tunnel lining structure, especially the two lining crack, a a numerical example using material cracking mechanism analysis and double track railway tunnel standard cross-section parameters, comparative analysis of extended finite element method and ANSYS simulation of crack proof, extended finite element The simulation method is relatively suitable way. Second, the cracking of tunnel lining of known be collected and used its causes and mechanical related or not classified, and give a qualitative criterion of some cracking reasons, finally determined the main factors of disease in this study. By using the extended finite element method (XFEM) were carried out numerical simulation and crack. Due to the lining cracking can better describe the extended finite element method, the length of crack shape and propagation, so this paper uses ABAQUS extended finite element on several common tunnel diseases were obtained in the simulation, the lining structure under the crack shape. These diseases include these tunnels disease: behind the various positions of the lining concrete hollow, thinning and bias. The fracture morphology appeared divided into longitudinal cracks and circumferential cracks, distribution in the two lining The corresponding part of the building. A numerical simulation of the disease causes often get a cracking, cracking state and causes of diseases caused by different sometimes very similar, so how to find the preliminary observation of cracking characteristics and causes of the relationship, is the focus of this paper.

【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(lèi)號(hào)】：U457.2

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 方孝伍;水工涵閘工程混凝土裂縫成因與抗裂技術(shù)研究[D];河海大學(xué);2004年

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本文編號(hào)：1709560