城市轨道交通盾构下穿既有高速铁路的相互作用研究

发布时间：2018-01-16 14:13

本文关键词：城市轨道交通盾构下穿既有高速铁路的相互作用研究　出处：《北京交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：城市轨道交通因其快速、便捷、方便、舒适、占地少、载客量大以及运营安全等特点作为支撑城市正常运行的大动脉在全国各大城市得到了迅速大规模的发展。同时,经过高速铁路建设和对既有铁路的高速化改造,我国已拥有全世界最大规模以及最高运营速度的高速铁路网。两者的线路在特定的空间位置不可避免地产生交叉。为了减少土地占用和对既有交通的影响,同时为了降低工程成本和对周围环境的影响,城市轨道交通下穿既有高铁线路成为主要形式,但下穿施工会导致既有高铁线路变形,产生轨道不平顺等现象,影响列车运行的平稳性和乘客的舒适性,并给列车运行安全带来隐患,同时列车的运行会给下穿施工和隧道的运营带来激扰,对两者相互作用关系进行研究显得十分必要。本文以某城市轨道盾构下穿既有高铁线路为工程背景,利用ABAQUS有限元软件对盾构开挖施工进行了仿真,研究了开挖沉降规律；并基于车辆-轨道耦合动力学理论建立了车辆-轨道-路基-下穿隧道耦合精细化动力学模型,分析了隧道开挖施工、运营与既有高速铁路线路列车运行的相互影响。主要研究成果如下： (1)建立了大尺度、精细化、接近工程实际的无砟轨道-路基-地基开挖模型和车辆-无砟轨道-路基-下穿隧道耦合动力学模型基于有限元软件ABAQUS丰富的岩土材料本构模型,建立了无砟轨道-路基-下穿隧道实体模型,利用生死单元技术模拟土体开挖、管片安装、盾尾脱空、壁后注浆等盾构施工过程；依靠轮轨动力学原理,通过Explicit模块罚函数接触属性建立车辆-无砟轨道-路基-下穿隧道耦合动力学模型。 (2)揭示了盾构开挖过程中既有高铁轨道结构的沉降规律并考虑不同埋深和开挖半径的影响基于所建立的无砟轨道-路基-地基开挖模型,研究了盾构开挖至距高铁线路不同位置处,既有高铁轨道的沉降规律,并对不同隧道埋深、不同开挖直径的工况进行沉降规律对比分析,结合现有的高速铁路设计规范对开挖导致的不均匀沉降进行评估。 (3)分析了盾构开挖至不同位置处和不同速度的高铁列车通过时既有轨道结构和下穿隧道的动力响应在所建立的车辆-无砟轨道-路基-下穿隧道模型基础上,将盾构施工导致的不平顺赋予给无砟轨道结构,探索开挖至距既有高铁线路不同位置处列车运行时轨道结构的动力响应,并对不同速度列车运营进行对比,研究表明,各车辆系统动力指标均在安全范围之内。 (4)研究了开挖离缝扩展后各结构的动态响应规律在ABAQUS模型中,离缝区域之外轨道板与砂浆层设置tie绑定接触属性(模拟实际中的“粘结”作用),在离缝区域采用铁路通用的正弦曲线模拟层间离缝,分析了0～15mm离缝量下各结构层的动态响应。
[Abstract]:Because of its fast, convenient, convenient and comfortable, urban rail transit occupies less land. As the main artery supporting the normal operation of the city, the large passenger capacity and operation safety have been developed rapidly and large-scale in the major cities of the country. At the same time, through the high-speed railway construction and high-speed transformation of the existing railway. China has the world's largest high-speed railway network with the highest operating speed. The two routes inevitably cross in a specific space. In order to reduce land occupation and the impact on existing traffic. At the same time, in order to reduce the cost of the project and the impact on the surrounding environment, urban rail transit under the existing high-speed rail lines become the main form, but the construction will lead to the deformation of existing high-speed rail lines, resulting in track irregularity and other phenomena. It affects the smooth running of the train and the comfort of the passengers, and brings hidden trouble to the safety of the train operation. At the same time, the running of the train will cause disturbance to the construction of the underpass and the operation of the tunnel. It is necessary to study the relationship between them. In this paper, based on the engineering background of an existing high-speed railway under a city rail shield, the excavation construction of shield is simulated by using ABAQUS finite element software, and the law of excavation settlement is studied. Based on the vehicle-track coupling dynamics theory, the vehicle-track-subgrade and underpass tunnel coupling fine dynamic model is established, and the tunnel excavation construction is analyzed. The interaction between operation and train operation of existing high-speed railway lines. The main research results are as follows: 1) the large-scale, fine and close engineering model of ballastless track subgrade foundation excavation and vehicle-ballastless track subgrade underpass tunnel coupling dynamics model is established. Based on the abundant constitutive model of geotechnical material of finite element software ABAQUS, the solid model of ballastless track, subgrade and underpass tunnel is established, and the earth excavation and segment installation are simulated by the birth and death element technique. Shield construction process, such as shield tail emptying and grouting at the back of the wall; Based on the wheel-rail dynamics principle, the coupled dynamic model of vehicle-ballastless track subgrade and underpass tunnel is established by the contact attribute of Explicit module penalty function. The settlement law of the existing high iron track structure during shield tunneling is revealed and the influence of different buried depth and excavation radius is considered. Based on the model of ballastless track subgrade and foundation excavation, the settlement law of existing high-speed railway track from shield excavation to different positions of high-speed railway line is studied, and the different tunnel depth is also studied. The settlement law of different excavation diameters is compared and analyzed, and the uneven settlement caused by excavation is evaluated in combination with the existing design code of high-speed railway. The dynamic response of the existing track structure and the underpass tunnel when the high-speed train is excavated to different positions and at different speeds by shield tunneling is analyzed. Based on the model of vehicle-ballastless track subgrade and underpass tunnel the irregularity caused by shield construction is assigned to ballastless track structure. This paper explores the dynamic response of track structure when the train is running at different locations from the existing high-speed railway line, and compares the train operation with different speeds. All vehicle system dynamic indicators are within the safety range. (4) the dynamic response of each structure after the expansion of the excavated seams is studied. In the ABAQUS model, the tie binding contact property is set between the track plate and the mortar layer outside the off-seam area (to simulate the "bond" effect in practice). In this paper, the sinusoidal curve is used to simulate the interlayer seams in the seams area. The dynamic response of each structure layer is analyzed under 0 ~ 15mm seams.
【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】：U455.43;U211

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