黄土地区小净距地铁隧道施工动态分析及二次衬砌优化研究
发布时间：2018-08-17 14:37
【摘要】：论文以西安地铁四号线雁南四路站~大唐芙蓉园站区间存车线大断面小间距隧道为研究对象,采用数值模拟分析和现场监测方法对黄土地区的浅埋小间距隧道的施工工艺、施工参数和变形规律进行了分析研究,并在此基础上对二次衬砌的厚度进行优化。论文的研究成果为西安市地铁四号线小间距隧道的施工提供了科学依据与技术指导。论文主要的工作及取得的成果如下:(1)隧道的开挖方法:论文基于实际工程背景,选取合适的计算参数,通过有限元软件对目前三种常用的大断面隧道的开挖方式进行分析,通过比较土体位移和支护结构的受力分析,得出了最优的施工方法。(2)施工参数优化:根据理论研究和以往经验选取大、小断面掌子面之间合理的间距,对不同间距的隧道施工过程进行三维数值模拟分析,分别比较地表沉降、支护结构变形和受力以及塑性区的分布情况,得到掌子面之间的间距为3倍洞径时较为合适。(3)隧道受力和变形规律:依据论文的优化结果通过数值模拟对隧道的开挖全过程的土体和支护结构的受力和变形规律进行分析总结,得出大断面小间距黄土隧道在开挖过程中的变形和受力特点,即地表最大沉降位置和支护结构的位移趋势;在此基础上和现场监测数据进行对比,验证了数值模拟结果的可靠性,为下一步隧道的施工提供理论上的指导。(4)二次衬砌优化:基于隧道设计的相关内容,通过有限元软件对不同厚度二次衬砌结构的受力情况进行求解,得到大断面隧道衬砌结构的内力分布和变形情况,研究了大断面衬砌结构的受力随厚度的变化规律,得到衬砌结构中受力最不利位置在拱腰仰拱处。基于不同厚度衬砌结构的受力情况,参考相关规范求出不同厚度衬砌结构的安全系数和配筋量。根据计算结果建立以工程造价为目标的数学模型,并以强度条件和配筋率为约束条件,通过对目标函数进行求解,分别计算出不同厚度衬砌结构的造价,得到满足约束条件的混凝土厚度为60cm时二衬造价最低。
[Abstract]:This paper takes Yannan Silu Station of Xi'an Metro Line No. 4 ~ Datang Furong Yuan Station as the research object, adopts numerical simulation analysis and field monitoring method to construct the shallow buried small spacing tunnel in loess area. The construction parameters and deformation law are analyzed and studied, and the thickness of secondary lining is optimized. The research results of this paper provide scientific basis and technical guidance for the construction of small spacing tunnel of Xi'an Metro Line No. 4. The main work and achievements are as follows: (1) the excavation method of tunnel: based on the actual engineering background, the paper selects the appropriate calculation parameters, and analyzes the excavation methods of three kinds of large section tunnel in common use by finite element software. The optimum construction method is obtained by comparing the displacement of soil mass with the stress of supporting structure. (2) Optimization of construction parameters: according to theoretical research and previous experience, reasonable spacing between large and small section face is selected. Three-dimensional numerical simulation analysis of tunnel construction process with different spacing is carried out to compare the surface settlement, deformation and stress of supporting structure and the distribution of plastic zone, respectively. When the distance between the face of the palm is 3 times the diameter of the tunnel, it is more suitable. (3) the law of tunnel stress and deformation: according to the optimization result of the paper, the stress and deformation of soil and supporting structure during the excavation of tunnel are simulated by numerical simulation. Law for analysis and summary, The deformation and stress characteristics of loess tunnel with large section and small spacing during excavation are obtained, that is, the maximum settlement position of the surface and the displacement trend of the supporting structure, and on this basis, the deformation and stress characteristics of the loess tunnel are compared with the field monitoring data. It verifies the reliability of the numerical simulation results and provides theoretical guidance for the next tunnel construction. (4) Secondary lining optimization: based on the relevant contents of tunnel design, The internal force distribution and deformation of large section tunnel lining structure are obtained by solving the stress situation of secondary lining structure with different thickness by finite element software, and the variation law of force and thickness of large section lining structure is studied. It is found that the most disadvantageous position of the lining structure is at the arch-waist invert. Based on the stress condition of lining structure with different thickness, the safety factor and reinforcement quantity of lining structure with different thickness are calculated by referring to relevant codes. According to the result of calculation, a mathematical model with the aim of engineering cost is established, and the cost of lining structure with different thickness is calculated by solving the objective function with the strength condition and reinforcement ratio as the constraint condition. When the thickness of concrete satisfying the constraint condition is 60cm, the cost of the second lining is the lowest.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455
本文编号：2187953
[Abstract]:This paper takes Yannan Silu Station of Xi'an Metro Line No. 4 ~ Datang Furong Yuan Station as the research object, adopts numerical simulation analysis and field monitoring method to construct the shallow buried small spacing tunnel in loess area. The construction parameters and deformation law are analyzed and studied, and the thickness of secondary lining is optimized. The research results of this paper provide scientific basis and technical guidance for the construction of small spacing tunnel of Xi'an Metro Line No. 4. The main work and achievements are as follows: (1) the excavation method of tunnel: based on the actual engineering background, the paper selects the appropriate calculation parameters, and analyzes the excavation methods of three kinds of large section tunnel in common use by finite element software. The optimum construction method is obtained by comparing the displacement of soil mass with the stress of supporting structure. (2) Optimization of construction parameters: according to theoretical research and previous experience, reasonable spacing between large and small section face is selected. Three-dimensional numerical simulation analysis of tunnel construction process with different spacing is carried out to compare the surface settlement, deformation and stress of supporting structure and the distribution of plastic zone, respectively. When the distance between the face of the palm is 3 times the diameter of the tunnel, it is more suitable. (3) the law of tunnel stress and deformation: according to the optimization result of the paper, the stress and deformation of soil and supporting structure during the excavation of tunnel are simulated by numerical simulation. Law for analysis and summary, The deformation and stress characteristics of loess tunnel with large section and small spacing during excavation are obtained, that is, the maximum settlement position of the surface and the displacement trend of the supporting structure, and on this basis, the deformation and stress characteristics of the loess tunnel are compared with the field monitoring data. It verifies the reliability of the numerical simulation results and provides theoretical guidance for the next tunnel construction. (4) Secondary lining optimization: based on the relevant contents of tunnel design, The internal force distribution and deformation of large section tunnel lining structure are obtained by solving the stress situation of secondary lining structure with different thickness by finite element software, and the variation law of force and thickness of large section lining structure is studied. It is found that the most disadvantageous position of the lining structure is at the arch-waist invert. Based on the stress condition of lining structure with different thickness, the safety factor and reinforcement quantity of lining structure with different thickness are calculated by referring to relevant codes. According to the result of calculation, a mathematical model with the aim of engineering cost is established, and the cost of lining structure with different thickness is calculated by solving the objective function with the strength condition and reinforcement ratio as the constraint condition. When the thickness of concrete satisfying the constraint condition is 60cm, the cost of the second lining is the lowest.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455
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