引大入秦工程盘道岭隧道病害成因及其整治技术研究
发布时间：2018-10-11 06:36
【摘要】：作为地下结构工程中的隧道结构，由于它自身所处的环境非常复杂，受许多因素的影响，这些因素包括：地质条件、水文条件、设计和施工等，使得建设完工后的隧道在运营期间不可避免地出现了许多病害，这些病害情况威胁着隧道结构的支撑性和安全性，本文以盘道岭隧道的两大病害衬砌渗漏水和衬砌裂缝着手，主要做了以下研究工作： (1)从目前隧道病害的现状出发，总结了衬砌渗漏水、衬砌裂缝的类型，以及对隧道结构造成的危害，又进一步分析了衬砌渗漏水和裂缝形成原因。 (2)由于盘道岭隧道有大量地下水的存在，而地下水矿化度高，水中化学离子含量变化异常，所以在盘道岭隧道洞内的9处典型的、较为严重的漏水点进行水化学分析，9个测点水化学分析的结果为5种类型，并且与1990年施工阶段的相同桩号处的离子种类、含量和矿化度进行对比，发现地下水中的离子含量平均而言，基本处于同一量级，变化不大。但是对9个桩号测点主要离子和矿化度等参数进行了归一化，发现地下水中HCO3-和SO42-具有很强的变化性，HCO3-和SO42-分别是衬砌侵蚀中硫酸盐侵蚀和溶出性侵蚀的主要例子含量，说明盘道岭隧道衬砌结构的侵蚀是以硫酸盐侵蚀和溶出性侵蚀为主的。由于盘道岭隧道高硫酸根离子的含量，造成地下混凝土结构性能的退化，而退化的程度是和腐蚀损伤度D有着直接的关系，腐蚀损伤度D造成了混凝土衬砌的力学指标的下降。 (3)在盘道岭隧洞内有多处衬砌出现裂缝，选择两处病害严重的洞段，选择两个典型断面进行仪器安装和观测，安装的测试项目有多点位移计、衬砌表面裂缝计、表面应变计和埋入式应变计，观测裂缝发展随时间一年的变化，研究裂缝发展的影响因素。从断裂力学的角度出发，计算裂缝衬砌的应力强度因子随着不同裂缝深度的变化的结果表达式，并使用有限元数值分析软件ABAQUS建立裂缝的数值模型，模拟裂缝的扩展，求得了不同裂缝深度下的应力强度因子，并与断裂力学强度因子的理论值数值进行比较，并且研究不同裂缝深度的影响。 (4)最后从隧道病害的原因出发，据隧道所在地的水文地质特性，全面系统的调查所有衬砌渗漏水的方式，渗漏出水的量，，水的性质，对渗漏水有针对性的制定治理措施，衬砌裂缝方面，从裂缝的特点出发根据不同的宽度和长度，使用不同材料，对纵斜向和环向裂缝进行治理，为今后隧道病害的治理提供帮助和参考。
[Abstract]:As a tunnel structure in underground structure engineering, because of its complex environment, it is affected by many factors, such as geological conditions, hydrological conditions, design and construction, etc. As a result, many diseases inevitably appear during the construction and completion of the tunnel, which threaten the support and safety of the tunnel structure. In this paper, the leakage of the two major diseases of the tunnel lining and the lining cracks are taken as the starting point. The main research works are as follows: (1) based on the present situation of tunnel diseases, this paper summarizes the leakage of lining, the types of cracks in lining, and the harm to tunnel structure. The reasons for the leakage of lining and the formation of cracks are further analyzed. (2) due to the existence of a large amount of groundwater in the Pandooling Tunnel, and the high salinity of groundwater, the variation of chemical ion content in the water is abnormal. So the hydrochemical analysis of 9 typical, more serious leakage points in the tunnel of Pandaoling Tunnel shows that the results of the chemical analysis of the 9 sites are 5 types, and the ion types of the same pile number in 1990 are the same as those in the construction stage in 1990. By comparing the content of ions with the degree of mineralization, it is found that the content of ions in groundwater is basically in the same order of magnitude, and there is little change in the content of ions in groundwater. However, the main ion and salinity parameters of 9 pile number measuring points were normalized. It was found that HCO3- and SO42- in groundwater had strong variability, and HCO3- and SO42- were the main examples of sulfate erosion and dissolution erosion in lining erosion, respectively. It shows that the erosion of the lining structure of Pandaoling tunnel is dominated by sulfate erosion and dissolution erosion. Because of the high content of sulfate ion in Pandaoling tunnel, the performance of underground concrete structure is degraded, and the degree of degradation is directly related to the corrosion damage degree D. The corrosion damage degree D causes the decrease of the mechanical index of concrete lining. (3) there are many cracks in the lining of Pandaoling tunnel, two seriously damaged sections of the tunnel are selected, and two typical sections are selected for installation and observation. The test items are multipoint displacement meter, lining surface crack gauge, surface strain gauge and embedded strain gauge. The variation of crack development with time is observed and the influencing factors of crack development are studied. From the angle of fracture mechanics, the stress intensity factor of crack lining is calculated with the change of crack depth, and the finite element numerical analysis software ABAQUS is used to establish the numerical model of crack to simulate the crack propagation. The stress intensity factors at different fracture depths are obtained, and compared with the theoretical values of fracture mechanical strength factors, and the effects of different fracture depths are studied. (4) finally, starting from the causes of tunnel diseases, According to the hydrogeological characteristics of the site of the tunnel, a comprehensive and systematic investigation of all the ways of leakage of lining, the quantity of leakage effluent, the nature of water, the establishment of targeted treatment measures for the leakage of water, and the aspects of cracks in the lining, According to the characteristics of cracks, according to different width and length, different materials are used to treat longitudinal and circumferential cracks, which can provide help and reference for the treatment of tunnel diseases in the future.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.2
本文编号：2263211
[Abstract]:As a tunnel structure in underground structure engineering, because of its complex environment, it is affected by many factors, such as geological conditions, hydrological conditions, design and construction, etc. As a result, many diseases inevitably appear during the construction and completion of the tunnel, which threaten the support and safety of the tunnel structure. In this paper, the leakage of the two major diseases of the tunnel lining and the lining cracks are taken as the starting point. The main research works are as follows: (1) based on the present situation of tunnel diseases, this paper summarizes the leakage of lining, the types of cracks in lining, and the harm to tunnel structure. The reasons for the leakage of lining and the formation of cracks are further analyzed. (2) due to the existence of a large amount of groundwater in the Pandooling Tunnel, and the high salinity of groundwater, the variation of chemical ion content in the water is abnormal. So the hydrochemical analysis of 9 typical, more serious leakage points in the tunnel of Pandaoling Tunnel shows that the results of the chemical analysis of the 9 sites are 5 types, and the ion types of the same pile number in 1990 are the same as those in the construction stage in 1990. By comparing the content of ions with the degree of mineralization, it is found that the content of ions in groundwater is basically in the same order of magnitude, and there is little change in the content of ions in groundwater. However, the main ion and salinity parameters of 9 pile number measuring points were normalized. It was found that HCO3- and SO42- in groundwater had strong variability, and HCO3- and SO42- were the main examples of sulfate erosion and dissolution erosion in lining erosion, respectively. It shows that the erosion of the lining structure of Pandaoling tunnel is dominated by sulfate erosion and dissolution erosion. Because of the high content of sulfate ion in Pandaoling tunnel, the performance of underground concrete structure is degraded, and the degree of degradation is directly related to the corrosion damage degree D. The corrosion damage degree D causes the decrease of the mechanical index of concrete lining. (3) there are many cracks in the lining of Pandaoling tunnel, two seriously damaged sections of the tunnel are selected, and two typical sections are selected for installation and observation. The test items are multipoint displacement meter, lining surface crack gauge, surface strain gauge and embedded strain gauge. The variation of crack development with time is observed and the influencing factors of crack development are studied. From the angle of fracture mechanics, the stress intensity factor of crack lining is calculated with the change of crack depth, and the finite element numerical analysis software ABAQUS is used to establish the numerical model of crack to simulate the crack propagation. The stress intensity factors at different fracture depths are obtained, and compared with the theoretical values of fracture mechanical strength factors, and the effects of different fracture depths are studied. (4) finally, starting from the causes of tunnel diseases, According to the hydrogeological characteristics of the site of the tunnel, a comprehensive and systematic investigation of all the ways of leakage of lining, the quantity of leakage effluent, the nature of water, the establishment of targeted treatment measures for the leakage of water, and the aspects of cracks in the lining, According to the characteristics of cracks, according to different width and length, different materials are used to treat longitudinal and circumferential cracks, which can provide help and reference for the treatment of tunnel diseases in the future.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.2
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