古牛坡隧道二次衬砌拆除方案研究
发布时间：2018-12-14 08:56
【摘要】：近年来,我国经济的腾飞伴随着交通行业的发展,隧道同样也得到广泛的利用,其方便快捷,节约时间成本,环境破坏小,因此隧道扮演着越来越重要的角色。然而,随着运营时间的不断推长,隧道的病害也愈加明显,成为当前隧道工程中不可忽视的问题。由于隧道的地质条件、气候因素、设计质量、管理方式、运营状况的影响,致使越来越的隧道出现衬砌裂缝、混凝土塌落、钢筋严重锈蚀、隧道漏水等问题。因此对隧道裂缝出现的原因进行分析和治理是隧道工程中一个重要研究点。隧道二次衬砌裂缝严重危害隧道安全运营,对隧道二次衬砌进行拆除并重新施作是目前治理该问题的一种主要手段。本文对依托工程进行了现场调查并探索了衬砌开裂原因,计算了二次衬砌的拆除进尺和拆除顺序,同时计算了爆破拆除时的炸药量,具体成果如下：(1)本文针对古牛坡隧道裂缝进行了现场调查,并统计了裂缝类型、深度、宽度、长度及走向,结合隧址区的地质资料和隧道设计资料,对裂缝产生的原因进行了分析,初步得出隧道裂缝产生的原因。(2)利用通用有限元软件ANSYS对古牛坡隧道二次衬砌的拆除进行了数值分析,依据以往工程经验,选取了2m、3m、4m、6m四种常见拆除进尺和先拱顶后拱腰及先拱腰后拱顶两种常见的拆除顺序进行讨论研究,从而得出较合理的拆除进尺和拆除顺序。(3)利用ANSYS/LS-DYNA软件建立隧道二次衬砌爆破拆除模型,并选取了四种常见装药量对隧道衬砌爆破拆除进行模拟分析,根据计算的位移应力进行综合分析,得到合理的装药量。
[Abstract]:In recent years, with the development of transportation industry, tunnel is also widely used, which is convenient and fast, saves time and cost, and has little environmental damage, so tunnel plays a more and more important role. However, with the continuous extension of operation time, tunnel diseases become more and more obvious, which can not be ignored in current tunnel engineering. Due to the influence of geological conditions, climate factors, design quality, management mode and operation conditions, more and more tunnel appear lining cracks, concrete collapse, serious corrosion of reinforcement, tunnel leakage and so on. Therefore, the analysis and treatment of tunnel cracks is an important research point in tunnel engineering. The second lining crack of tunnel seriously endangers the safe operation of tunnel. It is one of the main measures to solve this problem to demolish and reapply the secondary lining of tunnel. In this paper, the field investigation of the supporting project is carried out and the reasons for the lining cracking are explored. The demolition advance and the demolition sequence of the secondary lining are calculated, and the explosive quantity during the blasting demolition is calculated at the same time. The specific results are as follows: (1) the field investigation of the cracks in GuNiupo tunnel is carried out, and the types, depth, width, length and direction of the cracks are counted, combined with the geological data and tunnel design data in the tunnel area. The causes of cracks are analyzed, and the causes of tunnel cracks are preliminarily obtained. (2) the demolition of secondary lining of GuNiupo tunnel is numerically analyzed by using the universal finite element software ANSYS. According to the previous engineering experience, 2 ms is selected. This paper discusses and studies the removal sequence of four kinds of common removal ruler, first arch and then arch waist, and first arch waist and then arch top, respectively, which are 3 m, 4 m, 6 m, 3 m, 4 m and 6 m, respectively. Thus a reasonable demolition scale and demolition sequence are obtained. (3) the model of tunnel secondary lining blasting demolition is established by using ANSYS/LS-DYNA software, and four kinds of common charge quantity are selected to simulate the tunnel lining blasting demolition. According to the calculated displacement stress, the reasonable charge quantity is obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457
本文编号：2378334
[Abstract]:In recent years, with the development of transportation industry, tunnel is also widely used, which is convenient and fast, saves time and cost, and has little environmental damage, so tunnel plays a more and more important role. However, with the continuous extension of operation time, tunnel diseases become more and more obvious, which can not be ignored in current tunnel engineering. Due to the influence of geological conditions, climate factors, design quality, management mode and operation conditions, more and more tunnel appear lining cracks, concrete collapse, serious corrosion of reinforcement, tunnel leakage and so on. Therefore, the analysis and treatment of tunnel cracks is an important research point in tunnel engineering. The second lining crack of tunnel seriously endangers the safe operation of tunnel. It is one of the main measures to solve this problem to demolish and reapply the secondary lining of tunnel. In this paper, the field investigation of the supporting project is carried out and the reasons for the lining cracking are explored. The demolition advance and the demolition sequence of the secondary lining are calculated, and the explosive quantity during the blasting demolition is calculated at the same time. The specific results are as follows: (1) the field investigation of the cracks in GuNiupo tunnel is carried out, and the types, depth, width, length and direction of the cracks are counted, combined with the geological data and tunnel design data in the tunnel area. The causes of cracks are analyzed, and the causes of tunnel cracks are preliminarily obtained. (2) the demolition of secondary lining of GuNiupo tunnel is numerically analyzed by using the universal finite element software ANSYS. According to the previous engineering experience, 2 ms is selected. This paper discusses and studies the removal sequence of four kinds of common removal ruler, first arch and then arch waist, and first arch waist and then arch top, respectively, which are 3 m, 4 m, 6 m, 3 m, 4 m and 6 m, respectively. Thus a reasonable demolition scale and demolition sequence are obtained. (3) the model of tunnel secondary lining blasting demolition is established by using ANSYS/LS-DYNA software, and four kinds of common charge quantity are selected to simulate the tunnel lining blasting demolition. According to the calculated displacement stress, the reasonable charge quantity is obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457
【参考文献】
相关期刊论文 前1条
1 刘庭金,朱合华,丁文其;某高速公路隧道二次衬砌安全性分析[J];岩石力学与工程学报;2004年01期
，本文编号：2378334
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