高速铁路隧道二次衬砌力学特性研究
发布时间：2019-03-28 08:15
【摘要】：近年来,以客运专线为重点的全国铁路网建设已经全面展开并得到了蓬勃发展,铁路隧道建设数量和总长度均位居世界第一。隧道建设规模的日益扩大与隧道建设理论不完善的矛盾日益突出,以经验设计方法为主导的隧道设计理论将迎来巨大的挑战。本文重点关注隧道二次衬砌支护结构,通过理论分析、工程试验和数值计算相结合的技术手段对二次衬砌结构力学特性展开深入研究,对二次衬砌结构设计方案的优化提供借鉴。主要取得了以下研究成果： (1)从现象上分析二次衬砌结构的承载特性。基于ABAQUS平台建立实际工程的三维有限元模型,运用扩展有限元法(XFEM)对于二次衬砌裂缝进行分析,指出二次衬砌裂缝分布规律、裂缝扩展过程、裂缝外观表现形式及发生机制。地层条件对于二次衬砌裂缝的分布和裂缝类型有着重要影响,随着地层侧压力系数的不断增大,先后在拱顶内侧产生纵向裂缝,结构左右两侧外部产生环向裂缝和结构底部外侧产生环向裂缝。 (2)从机理上分析二次衬砌结构的承载特性。采用数值模拟方法,引入混凝土塑性损伤本构模型,分析得到二次衬砌结构的承载特性。明确二次衬砌结构的弹塑性典型破坏过程,拱脚是最易破坏区域,应采取加固措施；对于钢筋混凝土二次衬砌和素混凝土二次衬砌两类结构类型,得出其在不同地层条件下的破坏规律,总结了配筋对于增强二次衬砌力学性能所发挥的作用；通过数值解与解析解的比较,验证了数值分析的可靠性。 (3)依托贵广高速铁路贺街隧道实验段工程现场监测实例,并结合二次衬砌受力工程案例统计分析,得到二次衬砌背后受力特点。指出二次衬砌最不利受力状态出现在拆模时,初支-二衬接触压力呈现出较大的分布离散性,而且二次衬砌所受荷载实际上是初支传递过来的形变压力,与规范上采用松散体高度计算得到的松散压力是不同的；拱顶接触压力较小。
[Abstract]:In recent years, the construction of national railway network, which focuses on passenger dedicated railway lines, has been carried out in an all-round way and has been vigorously developed. The number and total length of railway tunnel construction rank first in the world. The contradiction between the increasing scale of tunnel construction and the imperfection of tunnel construction theory is becoming more and more prominent. The tunnel design theory dominated by empirical design method will face a huge challenge. This paper focuses on the secondary lining supporting structure of tunnel. By means of theoretical analysis, engineering test and numerical calculation, the mechanical characteristics of secondary lining structure are studied deeply. It provides reference for the optimization of the design scheme of secondary lining structure. The main results are as follows: (1) the bearing characteristics of the secondary lining structure are analyzed from the phenomenon. Based on the ABAQUS platform, the three-dimensional finite element model of practical engineering is established. The crack distribution law and crack propagation process of the secondary lining are analyzed by using the extended finite element method (XFEM), and the crack distribution law of the secondary lining is pointed out. The appearance of fracture and its occurrence mechanism. The formation conditions have an important influence on the distribution and type of cracks in the secondary lining. With the increasing of pressure coefficient on the side of the stratum, longitudinal cracks occur successively on the inside of the arch. There are circumferential cracks on the left and right sides of the structure and circumferential cracks on the outer side of the bottom of the structure. (2) the bearing characteristics of the secondary lining structure are analyzed from the point of view of mechanism. Using numerical simulation method and introducing plastic damage constitutive model of concrete, the bearing characteristics of secondary lining structure are analyzed. The typical elasto-plastic failure process of secondary lining structure is defined, and the arch foot is the most vulnerable area, so reinforcement measures should be taken. For two types of structures, reinforced concrete secondary lining and plain concrete secondary lining, the failure law of reinforced concrete secondary lining under different stratum conditions is obtained, and the effect of reinforcement on strengthening the mechanical properties of secondary lining is summarized. The reliability of the numerical analysis is verified by comparing the numerical solution with the analytical solution. (3) based on the example of on-the-spot monitoring in the experimental section of Hejie tunnel of Guiguang high-speed railway, and combined with the statistical analysis of the secondary lining stress engineering case, the stress characteristics behind the secondary lining are obtained. It is pointed out that when the most unfavorable stress state of the secondary lining occurs when the mould is removed, the contact pressure between the initial support and the second lining presents a large distribution dispersion, and the load on the secondary lining is actually the deformation pressure transmitted from the initial support. It is different from the loose pressure calculated by the height of loose body in the standard. The contact pressure of the arch is small.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.4
[Abstract]:In recent years, the construction of national railway network, which focuses on passenger dedicated railway lines, has been carried out in an all-round way and has been vigorously developed. The number and total length of railway tunnel construction rank first in the world. The contradiction between the increasing scale of tunnel construction and the imperfection of tunnel construction theory is becoming more and more prominent. The tunnel design theory dominated by empirical design method will face a huge challenge. This paper focuses on the secondary lining supporting structure of tunnel. By means of theoretical analysis, engineering test and numerical calculation, the mechanical characteristics of secondary lining structure are studied deeply. It provides reference for the optimization of the design scheme of secondary lining structure. The main results are as follows: (1) the bearing characteristics of the secondary lining structure are analyzed from the phenomenon. Based on the ABAQUS platform, the three-dimensional finite element model of practical engineering is established. The crack distribution law and crack propagation process of the secondary lining are analyzed by using the extended finite element method (XFEM), and the crack distribution law of the secondary lining is pointed out. The appearance of fracture and its occurrence mechanism. The formation conditions have an important influence on the distribution and type of cracks in the secondary lining. With the increasing of pressure coefficient on the side of the stratum, longitudinal cracks occur successively on the inside of the arch. There are circumferential cracks on the left and right sides of the structure and circumferential cracks on the outer side of the bottom of the structure. (2) the bearing characteristics of the secondary lining structure are analyzed from the point of view of mechanism. Using numerical simulation method and introducing plastic damage constitutive model of concrete, the bearing characteristics of secondary lining structure are analyzed. The typical elasto-plastic failure process of secondary lining structure is defined, and the arch foot is the most vulnerable area, so reinforcement measures should be taken. For two types of structures, reinforced concrete secondary lining and plain concrete secondary lining, the failure law of reinforced concrete secondary lining under different stratum conditions is obtained, and the effect of reinforcement on strengthening the mechanical properties of secondary lining is summarized. The reliability of the numerical analysis is verified by comparing the numerical solution with the analytical solution. (3) based on the example of on-the-spot monitoring in the experimental section of Hejie tunnel of Guiguang high-speed railway, and combined with the statistical analysis of the secondary lining stress engineering case, the stress characteristics behind the secondary lining are obtained. It is pointed out that when the most unfavorable stress state of the secondary lining occurs when the mould is removed, the contact pressure between the initial support and the second lining presents a large distribution dispersion, and the load on the secondary lining is actually the deformation pressure transmitted from the initial support. It is different from the loose pressure calculated by the height of loose body in the standard. The contact pressure of the arch is small.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.4
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