暗挖地铁隧道下穿高速铁路路基沉降规律与控制措施研究

发布时间：2018-07-03 13:36

本文选题：城市地铁隧道 + 高速铁路　；参考：《北京交通大学》2015年硕士论文

【摘要】：随着我国高速铁路逐渐形成网络,今后必然会出现大量穿越高速铁路的交通工程,由于高速铁路的特殊性,新建公路和铁路与已建或在建高速铁路交叉跨越时,应优先选择公路或铁路下穿高速铁路方案。路基沉降是下穿高速铁路的关键技术问题,研究隧道下穿高速铁路路基沉降控制技术对确保高速铁路运营安全、满足工程建设需求具有重要意义和实用价值。本文从前人研究的基础上,从隧道下穿施工引起高速铁路路基沉降及轨道变形的机理出发,并根据国内外相关规范对高速铁路路基及轨道变形要求提出隧道下穿高速铁路路基沉降及轨道变形的控制标准,重点分析了穿越工程中不同影响因素对高速铁路路基沉降及轨道变形的影响规律,最后根据基于控制路基及轨道变形的思想提出穿越工程中的穿越可行性指标,并基于这种控制指标体系下对软土地层条件下不同辅助工法隧道穿越可行性研究。论文主要完成了以下的研究工作： (1)根据隧道开挖引起地层变形传递规律,分析了地层-路基-轨道板及铁轨三者之间相互作用关系,并分析了由于地层变形引起的路基沉降与轨道变形的机理。 (2)通过查阅国内外对高速铁路路基沉降与轨道变形的相关规范,结合国内实际穿越工程中的控制标准,根据安全性、适应性、经济性等原则提出了穿越工程中高速铁路路基沉降及轨道变形的控制标准。 (3)根据城市地铁隧道穿越高速铁路的工程特点,分析了穿越工程中高速铁路路基及轨道变形的影响因素,并采用FLAC3D对不同影响因素进行数值模拟,分析了隧道下穿高速铁路路基与轨道变形的时空分布规律。 (4)根据高速铁路路基“工后零沉降”控制理论,提出来基于控制高速铁路路基及轨道变形穿越可行性指标,并重点分析了软土地层在采取不同辅助工法条件下穿越可行性分析,为今后隧道下穿高速铁路工程提供指导。
[Abstract]:With the gradual formation of high-speed railway network in China, there will be a large number of traffic projects crossing the high-speed railway in the future. Because of the particularity of the high-speed railway, when the new highway and railway cross and cross with the existing or under construction high-speed railway, Priority should be given to highway or railway underpass high-speed railway schemes. The subgrade settlement is the key technical problem of the high-speed railway under the tunnel. It is of great significance and practical value to study the subgrade settlement control technology under the tunnel in order to ensure the operation safety of the high-speed railway and meet the needs of the engineering construction. On the basis of previous studies, this paper starts from the mechanism of subgrade settlement and track deformation of high-speed railway caused by tunnel underpass construction. According to the requirements of roadbed and track deformation of high-speed railway at home and abroad, the control standard of subgrade settlement and track deformation under tunnel is put forward. The influence of different factors on the subgrade settlement and track deformation of high-speed railway is analyzed emphatically. Finally, based on the idea of controlling subgrade and track deformation, the feasibility index of crossing is put forward. Based on the control index system, the feasibility of tunnel crossing with different auxiliary engineering methods in soft soil is studied. The main work of this paper is as follows: (1) according to the law of stratum deformation transfer caused by tunnel excavation, the interaction between stratum subgrade track plate and rail is analyzed. The mechanism of subgrade settlement and track deformation caused by ground deformation is also analyzed. (2) through consulting the relevant codes of subgrade settlement and track deformation at home and abroad, combining with the control standards in the domestic actual crossing engineering, the paper analyzes the mechanism of roadbed settlement and track deformation caused by ground deformation. According to the principles of safety, adaptability and economy, the paper puts forward the control standard of subgrade settlement and track deformation of high-speed railway in crossing project. (3) according to the engineering characteristics of urban subway tunnel crossing high-speed railway, The influencing factors of roadbed and track deformation of high-speed railway in crossing engineering are analyzed, and the numerical simulation of different influencing factors is carried out by FLAC3D. The spatial and temporal distribution of subgrade and track deformation under tunnel is analyzed. (4) according to the control theory of "zero settlement after construction" of high-speed railway subgrade, the feasibility index of controlling high-speed railway roadbed and track deformation crossing is put forward. The feasibility analysis of crossing the soft soil stratum under the condition of different auxiliary engineering method is analyzed emphatically, which provides guidance for the tunnel underpass high speed railway project in the future.
【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】：U456.3;U213.157

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