隧道衬砌致害机理与加固措施研究

发布时间：2018-05-19 01:40

本文选题：衬砌缺陷 + 致害机理　；参考：《西南交通大学》2017年硕士论文

【摘要】：近年来,伴随着我国交通的发展,公路隧道和铁路隧道大规模的建设,然而相当比例的运营隧道存在不同程度的衬砌缺陷和病害问题,严重影响了衬砌结构的安全性。本文综合运用理论分析和数值模拟提出缺陷的判定标准,同时搜集衬砌加固资料等多种技术研究手段,对隧道衬砌结构质量缺陷和病害的一般规律和衬砌结构安全系数的影响规律及隧道加固整治措施进行了深入研究,主要工作及研究成果总结如下:(1)研究了隧道的常见缺陷:衬砌厚度不足、钢筋数量不足、衬砌背后存在空洞。其中隧道衬砌厚度的不足和钢筋数量不足会直接导致隧道衬砌结构承载能力的降低,衬砌背后存在空洞时,衬砌结构承受较大侧压,其上边缘容易受拉开裂,当隧道存在渗漏水时,渗漏水通过空洞和裂缝进入衬砌结构,将造成渗漏、冻害等。(2)基于有限元分析软件建立了运营隧道衬砌厚度不足、背后空洞的缺陷模型,运用有限元分析软件进行数值模拟,分析了衬砌厚度不足和背后空洞缺陷出现时,衬砌结构内力的变化情况,并依据铁路隧道设计规范计算衬砌结构安全系数,并得出的变化规律。(3)针对不同缺陷,总结了相应的缺陷的判定标准,并对缺陷进行分级。根据缺陷的分级再考虑相应的对策。对现有的缺陷整治方法进行总结,并针对不同的缺陷等级,提出相应的整治措施,对隧道缺陷整治具有一定指导意义。
[Abstract]:In recent years, with the development of traffic in our country, highway tunnel and railway tunnel are built on a large scale. However, a considerable proportion of operating tunnels have different degree of lining defects and disease problems, which seriously affect the safety of lining structure. In this paper, theoretical analysis and numerical simulation are used to propose criteria for judging defects, and various technical research methods, such as collecting lining reinforcement data, are also collected. The general law of quality defects and defects of tunnel lining structure, the influence law of safety factor of lining structure and the measures of tunnel reinforcement and treatment are studied. The main work and research results are summarized as follows: 1) the common defects of the tunnel are studied: the thickness of lining is insufficient, the number of reinforcement is insufficient, and there are voids behind the lining. The insufficient thickness of tunnel lining and the insufficient number of reinforcement will directly lead to the reduction of the bearing capacity of tunnel lining structure. When there are holes behind the lining, the lining structure is subjected to greater lateral pressure, and the upper edge of the lining is susceptible to tensile cracking. When there is leakage water in tunnel, the leakage water enters the lining structure through holes and cracks, which will cause leakage, freezing damage, etc.) based on the finite element analysis software, the defect model of the tunnel lining thickness insufficiency and the cavity behind the tunnel is established. The finite element analysis software is used to simulate the internal force of the lining structure when the thickness of the lining is insufficient and the cavity defect appears behind the lining, and the safety factor of the lining structure is calculated according to the design code of the railway tunnel. According to different defects, the judgment standards of defects are summarized, and the defects are classified. Consider the corresponding countermeasures according to the classification of defects. The existing defect treatment methods are summarized and the corresponding regulation measures are put forward according to different defect grades, which has certain guiding significance for tunnel defect treatment.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U457.2

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