地铁盾构隧道管片接头抗渗与耐久性能演化研究
发布时间：2018-12-20 14:36
【摘要】：作为重大基础设施城市轨道交通多修建于地下,存在服役环境复杂、可维修性差以及维护成本高等特点。对于轨道交通普遍采用的盾构隧道而言,其管片接头是衬砌的连接的重要部位同时也是薄弱环节,其耐久性问题相对突出且对隧道整体耐久性能有极其重要影响。 本文依托国家基础研究发展计划(973)《地下结构性能与环境耦合作用机制》(2011CB013802)等课题为依托,以长沙地铁隧道实际工程为背景,采用理论分析,试验模拟以及数值仿真等手段,对地下环境下地铁隧道管片接头耐久性能演化进行系统地研究。 (1)在总结管片接头服役环境常见影响因素的基础上,从材料和结构两方面分析了管片接头耐久性问题,提出了以抗渗性能为指标的耐久性能评价标准。 (2)针对管片接头服役环境,进行了地下水环境下管片接头防水材料——三元乙丙橡胶加速老化试验,得出了水环境下橡胶材料的性能劣化规律。由此构建了接缝防水材料时变演化模型,分析了超弹性材料参数性能劣化规律。 (3)设计管片接头抗渗性能试验装置,进行了多种接触状态下接头抗渗性能试验,着重研究了接头渗流发生后其渗流变化规律。将接头渗流视为平面狭缝渗流问题,提出了接头应力—渗流耦合模型,推导了接触界面应力—渗流耦合方程,分析了接头变形状态与渗流关系问题。 (4)采用数值计算方法,从局部与整体两个层次分别建立管片接头应力松弛演化模型及盾构隧道三维多尺度混合模型,引入防水材料时变演化模型,分析了衬砌结构在服役周期内接触压力变化及趋势,结合接触边界应力—渗流耦合方程,揭示了管片接头在全寿命周期内的耐久性能演化过程,并据此对管片接头维护提出了合理建议。 (5)通过盾构隧道三维多尺度混合模型给出了隧道服役的一种典型差异沉降情况,分析计算了此工况下管片接头在不同外界水压下的耐久性能演化过程及寿命预测值,绘制了管片接头寿命评估图,并以此结果为基础评估了管片接头满足耐久性要求的外界条件。
[Abstract]:As a major infrastructure urban rail transit is mostly built underground which has the characteristics of complex service environment poor maintainability and high maintenance cost. For shield tunnel which is widely used in rail transit, the segment joint is an important part of lining connection and is also a weak link. The durability problem is relatively prominent and has an extremely important impact on the overall durability of the tunnel. Based on the National basic Research and Development Program (973), "Coupling Mechanism of Underground structure performance and Environment" (2011CB013802), and taking the actual project of Changsha Metro Tunnel as the background, this paper adopts theoretical analysis. By means of experimental simulation and numerical simulation, the durability evolution of segment joints in underground subway tunnel is studied systematically. The main contents are as follows: (1) on the basis of summarizing the common influencing factors of segment joint service environment, the durability problem of segment joint is analyzed from two aspects of material and structure, and the evaluation standard of durability is put forward, which takes impermeability as index. (2) in view of the service environment of segment joint, the accelerated aging test of ethylene propylene diene rubber (EPDM), a waterproof material for segment joint under groundwater environment, was carried out, and the performance deterioration rule of rubber material in water environment was obtained. A time-varying evolution model of jointed waterproofing material was established, and the degradation rule of hyperelastic material parameters was analyzed. (3) the impermeability test equipment of segment joint is designed, and the seepage resistance test of joint under various contact conditions is carried out, and the seepage variation law of joint seepage is studied emphatically. The joint seepage is regarded as a plane slit seepage problem. A joint stress-seepage coupling model is proposed. The contact interface stress-seepage coupling equation is derived and the relationship between the joint deformation state and seepage flow is analyzed. (4) the stress relaxation evolution model of segment joint and the three-dimensional multi-scale mixed model of shield tunnel are established by numerical calculation method, and the time-varying evolution model of waterproof material is introduced. The variation and trend of contact pressure during the service cycle of lining structure are analyzed. Combined with the contact boundary stress-seepage coupling equation, the evolution process of durability performance of segment joints during the whole life cycle is revealed. Based on this, reasonable suggestions are put forward for segment joint maintenance. (5) A typical differential settlement of tunnel service is given by using the three-dimensional multi-scale hybrid model of shield tunnel, and the evolution process and life prediction value of segment joints under different external water pressure are analyzed and calculated. The life evaluation diagram of segment joint was drawn, and the external condition of segment joint meeting durability requirement was evaluated on the basis of the result.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.3;U455.43
本文编号：2388137
[Abstract]:As a major infrastructure urban rail transit is mostly built underground which has the characteristics of complex service environment poor maintainability and high maintenance cost. For shield tunnel which is widely used in rail transit, the segment joint is an important part of lining connection and is also a weak link. The durability problem is relatively prominent and has an extremely important impact on the overall durability of the tunnel. Based on the National basic Research and Development Program (973), "Coupling Mechanism of Underground structure performance and Environment" (2011CB013802), and taking the actual project of Changsha Metro Tunnel as the background, this paper adopts theoretical analysis. By means of experimental simulation and numerical simulation, the durability evolution of segment joints in underground subway tunnel is studied systematically. The main contents are as follows: (1) on the basis of summarizing the common influencing factors of segment joint service environment, the durability problem of segment joint is analyzed from two aspects of material and structure, and the evaluation standard of durability is put forward, which takes impermeability as index. (2) in view of the service environment of segment joint, the accelerated aging test of ethylene propylene diene rubber (EPDM), a waterproof material for segment joint under groundwater environment, was carried out, and the performance deterioration rule of rubber material in water environment was obtained. A time-varying evolution model of jointed waterproofing material was established, and the degradation rule of hyperelastic material parameters was analyzed. (3) the impermeability test equipment of segment joint is designed, and the seepage resistance test of joint under various contact conditions is carried out, and the seepage variation law of joint seepage is studied emphatically. The joint seepage is regarded as a plane slit seepage problem. A joint stress-seepage coupling model is proposed. The contact interface stress-seepage coupling equation is derived and the relationship between the joint deformation state and seepage flow is analyzed. (4) the stress relaxation evolution model of segment joint and the three-dimensional multi-scale mixed model of shield tunnel are established by numerical calculation method, and the time-varying evolution model of waterproof material is introduced. The variation and trend of contact pressure during the service cycle of lining structure are analyzed. Combined with the contact boundary stress-seepage coupling equation, the evolution process of durability performance of segment joints during the whole life cycle is revealed. Based on this, reasonable suggestions are put forward for segment joint maintenance. (5) A typical differential settlement of tunnel service is given by using the three-dimensional multi-scale hybrid model of shield tunnel, and the evolution process and life prediction value of segment joints under different external water pressure are analyzed and calculated. The life evaluation diagram of segment joint was drawn, and the external condition of segment joint meeting durability requirement was evaluated on the basis of the result.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.3;U455.43
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