地铁盾构隧道钢板衬加固效果的数值试验研究

发布时间：2018-05-07 06:33

本文选题：盾构隧道 + 钢板衬　；参考：《华南理工大学》2014年硕士论文

【摘要】：盾构隧道的优势使得它在城市地铁建设中得到广泛应用，并随着城市地下空间的进一步开发而将地下轨道交通建设推向高潮。然而，地铁盾构隧道的广泛运用也使得地铁盾构隧道的修复加固问题越来越突出。处于复杂工程地质条件下的地铁盾构隧道，，在受外部作业不利影响时，将会改变盾构隧道结构的受力状态，可能导致盾构隧道产生过大的横向变形，引发管片开裂、接缝张开、螺栓失效等现象，进而诱发隧道病害，给地铁隧道的正常运营带来安全隐患，甚至引发严重事故，造成重大损失。因此，对地铁盾构隧道结构的修复加固具有重要意义。目前，对横向变形地铁盾构隧道主要采用钢板衬加固，但对地铁盾构隧道钢板衬加固的研究较少，如何分析其加固效果尚待研究。本文以某地铁盾构隧道钢板衬加固工程为背景，采用数值试验研究手段，建立相应的精细数值模型，并针对典型工况进行数值分析，进而对地铁盾构隧道钢板衬加固效果进行系统研究。本文主要工作和研究成果如下：（1）总结了盾构隧道结构特性及其修复加固的研究现状；简述了钢筋混凝土结构钢板衬加固技术及数值试验研究的发展与现状。（2）依据某地铁盾构隧道钢板衬加固工程，结合MIDAS/FEA有限元分析软件的相关功能和特点，建立了相应的精细数值试验模型。（3）基于工程实践背景和研究需要，选取了数值试验研究的代表性工况，并结合数值计算结果，对比分析加固与未加固结构在典型工况下的结构受力与变形规律，进而分析结构的加固效果。（4）根据工程实际需要，在对比分析结构破坏特征的基础上，对地铁盾构隧道结构横向变形控制指标—“椭圆度”进行分析，进而分析得出了地铁盾构隧道结构在不同椭圆度下的受力状态及其加固效果，并应用于实际工程。
[Abstract]:The advantages of shield tunnel make it widely used in urban subway construction, and with the further development of urban underground space, the underground rail transit construction is pushed to the climax. However, the extensive use of subway shield tunnel also makes the subway shield tunnel repair and reinforcement more and more prominent. The shield tunnel under complex engineering geological conditions will change the stress state of shield tunnel structure when it is adversely affected by external operation, which may lead to excessive transverse deformation of shield tunnel, lead to segment cracking and joint opening. The failure of bolts can induce tunnel diseases, bring safety hidden trouble to the normal operation of subway tunnel, and even cause serious accidents, resulting in great losses. Therefore, it is of great significance to repair and reinforce the subway shield tunnel structure. At present, the steel plate lining is mainly used to reinforce the transverse deformation subway shield tunnel, but the research on the steel plate lining reinforcement of the subway shield tunnel is less, how to analyze its reinforcement effect remains to be studied. In this paper, based on the steel plate lining reinforcement project of a certain iron shield tunnel, the corresponding fine numerical model is established by means of numerical test, and the numerical analysis is carried out according to the typical working conditions. Furthermore, the reinforcement effect of steel plate lining of shield tunnel is studied systematically. The main work and research results of this paper are as follows: In this paper, the characteristics of shield tunnel structure and the present situation of its repair and reinforcement are summarized, and the development and present situation of steel plate lining strengthening technology and numerical test of reinforced concrete structure are briefly described. 2) according to the steel plate lining and strengthening project of a certain place of iron shield tunnel, combined with the relevant function and characteristics of MIDAS/FEA finite element analysis software, the corresponding fine numerical test model is established. 3) based on the engineering practice background and research needs, the representative conditions of numerical experimental research are selected, and combined with the results of numerical calculation, the stress and deformation laws of strengthened and unstrengthened structures under typical working conditions are compared and analyzed. Then the reinforcement effect of the structure is analyzed. 4) according to the actual needs of the project, on the basis of comparing and analyzing the structural failure characteristics, the paper analyzes the control index of transverse deformation of the shield tunnel structure of the subway-"ellipticity". The stress state and reinforcement effect of shield tunnel structure under different ellipticity are analyzed and applied to practical engineering.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U231.3

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