裂缝条件下盾构管片氯盐侵蚀数值模拟与耐久性能研究
发布时间：2018-09-17 07:22
【摘要】：地铁在迅猛发展的同时也日益暴露出很多问题,随之逐渐开始了针对地铁结构耐久性问题的研究。本文以973国家重点基础研究计划项目(2011CB013802)课题二“地下结构性能与环境耦合作用机制”为依托,针对带裂缝盾构隧道管片混凝土结构在氯离子侵蚀和荷载耦合作用下的耐久性能展开相关研究。主要研究内容如下： (1)基于已完成的氯离子侵蚀和荷载耦合作用下管片性能试验(人工环境试验)数据总结提炼出了管片混凝土结构在氯离子侵蚀下的表面氯离子浓度、扩散系数等参数的时变表达式； (2)结合所得相关参数,基于Comsol Multiphysics软件建立氯离子侵蚀管片混凝土模型,以侵蚀时间、氯盐侵蚀溶液浓度为试验因子进行氯离子侵蚀机制数值模拟研究,探讨了侵蚀时间及氯盐侵蚀溶液浓度对氯离子在混凝土内部扩散的影响,并将数值模拟结果与人工环境试验结果进行了对比分析； (3)对混凝土裂缝的成因及表征参数进行分析,进而建立考虑裂缝的氯离子侵蚀机制数值模拟模型,以裂缝宽度及深度作为试验因子探讨裂缝对氯离子侵蚀的影响,进一步分析裂缝的影响范围及其对氯离子侵蚀的作用,并建立了考虑裂缝的氯离子侵蚀模型； (4)通过理论分析,确定管片结构的荷载裂缝计算表达式,结合考虑裂缝的氯离子侵蚀模型建立耦合裂缝、侵蚀环境、荷载作用下管片耐久性能评价模型。图44副,表34个,参考文献94篇。
[Abstract]:With the rapid development of subway, many problems have been exposed day by day. This paper is based on the "Coupling Mechanism of Underground structure performance and Environment", Project II of the 973 National key basic Research Program (2011CB013802). The durability of the segmented concrete structure of shield tunnel with cracks under the action of chloride ion erosion and load coupling is studied in this paper. The main research contents are as follows: (1) based on the experimental data of segment performance under chloride ion erosion and load coupling (artificial environment test), segment concrete structure is extracted under chloride ion erosion. The concentration of chlorine ions on the surface, The time-varying expression of diffusion coefficient and other parameters. (2) based on Comsol Multiphysics software, the model of chloride ion erosion segment concrete is established. The mechanism of chloride ion erosion was numerically simulated by chloride solution concentration as experimental factor. The effects of erosion time and chloride solution concentration on chloride ion diffusion in concrete were discussed. The numerical simulation results are compared with the results of artificial environment test. (3) the causes and characterization parameters of concrete cracks are analyzed, and the numerical simulation model of chloride erosion mechanism considering cracks is established. The influence of crack width and depth on chloride ion erosion is discussed, the influence range of crack and its effect on chloride ion erosion are analyzed, and a chloride erosion model considering crack is established. (4) through theoretical analysis, the calculation expression of load crack of segment structure is determined. Combined with chloride ion erosion model considering crack, the coupled crack, erosion environment and durability evaluation model of segment under load are established. 44 pairs of figs, 34 tables and 94 references.
【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】：U455.43
[Abstract]:With the rapid development of subway, many problems have been exposed day by day. This paper is based on the "Coupling Mechanism of Underground structure performance and Environment", Project II of the 973 National key basic Research Program (2011CB013802). The durability of the segmented concrete structure of shield tunnel with cracks under the action of chloride ion erosion and load coupling is studied in this paper. The main research contents are as follows: (1) based on the experimental data of segment performance under chloride ion erosion and load coupling (artificial environment test), segment concrete structure is extracted under chloride ion erosion. The concentration of chlorine ions on the surface, The time-varying expression of diffusion coefficient and other parameters. (2) based on Comsol Multiphysics software, the model of chloride ion erosion segment concrete is established. The mechanism of chloride ion erosion was numerically simulated by chloride solution concentration as experimental factor. The effects of erosion time and chloride solution concentration on chloride ion diffusion in concrete were discussed. The numerical simulation results are compared with the results of artificial environment test. (3) the causes and characterization parameters of concrete cracks are analyzed, and the numerical simulation model of chloride erosion mechanism considering cracks is established. The influence of crack width and depth on chloride ion erosion is discussed, the influence range of crack and its effect on chloride ion erosion are analyzed, and a chloride erosion model considering crack is established. (4) through theoretical analysis, the calculation expression of load crack of segment structure is determined. Combined with chloride ion erosion model considering crack, the coupled crack, erosion environment and durability evaluation model of segment under load are established. 44 pairs of figs, 34 tables and 94 references.
【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】：U455.43
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