隧道施工缺陷对营运的风险性分析

发布时间：2018-05-05 06:31

本文选题：新建隧道 + 结构安全系数　；参考：《重庆交通大学》2015年硕士论文

【摘要】：当前我国已成为隧道工程最多、最复杂、发展最快的国家之一。随着目前我国公路隧道工程数量的增加和建设速度的加快,由于施工各方面的原因,部分已建和在建的公路隧道都出现了不同程度的质量问题,有的甚至影响了隧道的正常运营,同时这些缺陷又给隧道的安全运营带来了潜在的风险性。然而由于隧道结构施工工艺复杂,地质条件不确定,施工工序繁多,使其在施工过程中存在不少潜在危险源,这些都极易产生施工缺陷,从而对隧道施工与运营产生了较大的影响;这些缺陷不仅影响着围岩与结构稳定性,而且影响施工与运营安全。因此,开展隧道施工缺陷对衬砌结构安全性影响的研究十分重要。鉴于此,本文通过运用理论分析和数值模拟等研究手段,针对衬砌厚度不足、衬砌背后空洞和衬砌结构裂缝等这三种病害对衬砌结构安全性的影响进行了研究,主要工作和研究成果总结如下:①以新建柳梢沟隧道为研究对象,通过检测结果,总结了造成隧道衬砌厚度不足、衬砌背后空洞和衬砌裂缝的主要成因及病害形式,分析了国内外对这三种典型病害的研究现状。②基于地层-结构法原理,通过衬砌结构的受力原理,结合柳梢沟隧道的病害形式,建立衬砌厚度不足、衬砌背后空洞和衬砌裂缝的简化计算模型。③采用有限元数值模拟,建立隧道三维状态下的计算模型,分析了衬砌厚度不足、衬砌背后空洞和衬砌裂缝的出现对衬砌结构截面安全系数的影响;得出缺陷在衬砌结构不同位置以及沿隧道纵向不同长度上衬砌结构的应力和安全系数的变化规律。④通过对以上研究成果的比较分析,得出隧道衬砌结构在施工缺陷作用下结构的安全性影响变化;分析了结构的受力变化,得出衬砌结构在不同病害作用下结构的安全性,为隧道结构的安全性评价和后期的运营监测提供了依据。
[Abstract]:At present, China has become one of the countries with the most tunnel engineering, the most complex and the fastest development. With the increase in the number of highway tunnel projects and the acceleration of construction speed in our country, due to various reasons of construction, some highway tunnels that have already been built and under construction have appeared different degree of quality problems. Some even affect the normal operation of the tunnel, at the same time, these defects bring potential risks to the safe operation of the tunnel. However, due to the complex construction technology of tunnel structure, uncertain geological conditions and numerous construction procedures, there are many potential hazard sources in the construction process, which are easy to produce construction defects. These defects not only affect the stability of surrounding rock and structure, but also affect the safety of construction and operation. Therefore, it is very important to study the influence of tunnel construction defects on the safety of lining structure. In this paper, by means of theoretical analysis and numerical simulation, the effects of three kinds of diseases, such as insufficient lining thickness, cavity behind lining and cracks in lining structure, on the safety of lining structure are studied. The main work and research results are summarized as follows: 1. Taking the newly built Liuzigou tunnel as the research object, through the test results, the main causes and disease forms of the tunnel lining thickness deficiency, the cavity behind the lining and the lining cracks are summarized. Based on the principle of stratigraphic structure method and the stress principle of lining structure and the disease form of Liuchaigou tunnel, this paper analyzes the present research situation of these three kinds of typical diseases at home and abroad, and establishes the insufficient thickness of lining. The simplified calculation model of cavity and crack behind lining .3 the finite element numerical simulation is used to establish the calculation model of tunnel in three dimensional state, and the shortage of lining thickness is analyzed. The influence of the cavity behind the lining and the lining crack on the safety factor of the lining structure section; The variation law of stress and safety factor of lining structure in different position of lining structure and along tunnel longitudinal length is obtained. The influence of tunnel lining structure on the safety of the structure under the action of construction defects is obtained, and the stress change of the structure is analyzed, and the safety of the lining structure under the action of different diseases is obtained. It provides the basis for the safety evaluation of tunnel structure and the later operation monitoring.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U458

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