隧道结构开裂病因力学正演分析

发布时间：2018-04-04 10:29

本文选题：扩展有限元　切入点：裂缝形态　出处：《西南交通大学》2015年硕士论文

【摘要】：衬砌结构破坏的不可预测性及严重破坏性一直是隧道工程界的瓶颈问题。由于隧道病害中尤以隧道衬砌结构开裂最为常见,且危害性极大,其产生和发展轻则引起隧道渗漏水,严重情况下会破坏隧道结构的稳定性,威胁行车安全,影响隧道乃至整个线路的安全运营,引起巨大的经济损失。故本文旨在找到裂缝表观特征与其产生原因之间的对应,即有效的根据表观特征判断可能的产生原因。主要工作如下：针对隧道衬砌结构,尤其是二次衬砌的开裂情况,利用材料开裂机理的分析和双线铁路隧道标准断面参数的一个算例,对比分析扩展有限元法和ANSYS模拟裂缝的方法,证明扩展有限元法是相对合适的模拟办法。其二,对已知的隧道衬砌结构开裂原因进行了搜集和整理,采用其原因与力学相关与否进行分类,并定性地给出了一些开裂原因的判别标准,最后确定了本文研究的主要病害因素。利用扩展有限元方法(XFEM)进行裂缝出现和开展的数值模拟。由于扩展有限元方法能较好地描述衬砌开裂的走向、长度等开裂形态以及扩展规律,故本文利用ABAQUS扩展有限元就几种常见的隧道病害进行模拟,得出衬砌结构在这些病害下的开裂形态。这些隧道病害包括：各个位置上的衬砌背后空洞、混凝土减薄以及偏压情况。而出现的裂缝形态分为纵向裂缝和环向裂缝,分布在二次衬砌上的相应部位。数值模拟中一种病害原因往往得到一种开裂状态,而不同的病害原因所导致的开裂状态有时会很类似,所以如何初步地找到观察得到的裂缝开裂特征与其原因之间的对应关系,是本文研究的重点。
[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.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U457.2

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