地铁盾构下穿高速铁路变形及受力影响研究

发布时间：2019-02-26 09:29

【摘要】：21世纪随着城市轨道交通及高速铁路的快速发展,地铁穿越高速铁路的工程不断出现。因此,在地铁盾构穿越高速铁路工程施工前,预测开挖引起的地层、路基和轨道等结构的最大变形和应力,研究轨道等结构的变形和应力规律,提出穿越路基型高速铁路采用的控制措施,对于地铁盾构穿越既有高速铁路工程具有非常重要的现实意义。本文以地铁十号线下穿京沪高铁和地铁十四号线下穿京津城际、京沪高铁为背景,应用大型有限元软件模拟了地铁盾构穿越高速铁路的动态施工过程。通过理论分析和数值模拟等方法,研究了地层条件、地铁埋深、双线水平间距和盾构施工参数(注浆效果、注浆压力和掌子面推力)等因素对地铁施工引起的地层、路基和轨道结构的变形及应力影响程度及其规律,提出地铁盾构穿越路基型高速铁路的建议控制标准及关键控制措施。主要完成以下四方面的工作： (1)阐述了盾构施工对高速铁路的影响是一个动态过程,同时也是地铁、地层和高速铁路结构相互作用的过程,提出了以地铁盾构、地层土体和高速铁路为主体三者构成了一个包含多元结构、多因素的综合作用体系,最终通过相互作用形成新的平衡。 (2)通过建立三维有限元模型,研究了地铁盾构穿越高速铁路工程中地层条件、地铁埋深、双线水平间距和盾构施工参数(注浆效果、注浆压力和掌子面推力)等因素对结构变形及受力的影响程度及规律,提出各影响因素与结构变形及应力之间的定性关系。 (3)以相关规范及本文研究内容为基础,提出了地铁下穿路基型高速铁路变形及应力的建议控制标准。 (4)提出从穿越工程影响来源、传播路径和保护对象三个方面考虑的施工关键控制措施,通过数值计算分析了三个方面的控制措施对高速铁路结构变形和应力控制能力的有效性。
[Abstract]:With the rapid development of urban rail transit and high-speed railway in the 21st century, the project of subway traversing high-speed railway appears constantly. Therefore, before the construction of subway shield through high-speed railway engineering, the maximum deformation and stress of strata, roadbed and track caused by excavation are predicted, and the deformation and stress law of track and other structures are studied. It is of great practical significance to put forward the control measures adopted through the high-speed railway through the base of the subway shield machine for the existing high-speed railway project. Based on the background of Beijing-Shanghai high-speed railway and Beijing-Tianjin high-speed railway under subway line 10 and Beijing-Tianjin intercity and Beijing-Shanghai high-speed railway, the dynamic construction process of subway shield machine passing through high-speed railway is simulated by using large-scale finite element software. By means of theoretical analysis and numerical simulation, the formation conditions, subway buried depth, two-line horizontal spacing and shield construction parameters (grouting effect, grouting pressure and palm surface thrust) are studied. The influence degree and law of deformation and stress of subgrade and track structure are discussed in this paper. The proposed control standard and key control measures for subway shield traversing high-speed railway are put forward. The main work is as follows: (1) the influence of shield construction on high-speed railway is a dynamic process, and it is also a process of interaction among subway, stratum and high-speed railway structure. Stratum and soil mass and high-speed railway as the main body constitute a multi-structural, multi-factor comprehensive action system, finally through the interaction to form a new balance. (2) through the establishment of a three-dimensional finite element model, the ground conditions, the buried depth of subway, the horizontal distance between two lines and the parameters of shield construction (grouting effect) are studied in the project of subway shield crossing through high-speed railway. The influence degree and law of grouting pressure and palm face thrust on the deformation and stress of the structure are discussed, and the qualitative relationship between the influence factors and the deformation and stress of the structure is put forward. (3) on the basis of the relevant codes and the research contents of this paper, the proposed control standards for deformation and stress of subway underpass high-speed railway are put forward. (4) the key control measures are put forward from three aspects: the source of influence, the path of propagation and the object of protection. The effectiveness of the control measures in three aspects to the deformation and stress control ability of high-speed railway structure is analyzed by numerical calculation.
【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】：U231.3;U455.43

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