【作者】 彭超；

【导师】 彭华；

【作者基本信息】 北京交通大学 ， 道路与铁道工程， 2010， 硕士

【摘要】 近年来城市轨道交通发展迅速,隧道开挖下穿既有地面线路的情况日益增多,而施工引起的地层沉降会导致轨道结构变形,这势必对线路的安全运营造成不利影响。当前盾构法已成为城市地铁施工中一种重要的施工方法,盾构推进引起地层移动的主要因素有盾构直径、埋深、土质、施工条件等。本文以土压平衡盾构机为例,使用通用有限元分析软件ABAQUS,采用整体法分析法,建立土体、道床、路基、轨道整体模型,选取合理的参数,模拟盾构施工过程,主要研究成果有以下几个方面：(一)通过对比盾构参数变化条件下轨道变形规律的差异,包括单线条件下改变开挖深度、直径、以及双线条件下超前开挖,为施工提供合理建议。(二)建立车辆—轨道垂向耦合动力学模型,分析盾构施工后所产生的轨道的静不平顺对轨道动力特性和车辆走行性能的影响,主要分析钢轨、车体垂向加速度、钢轨动位移及轮轨力的变化规律,为线路运营提供合理建议。更多还原

【Abstract】 In recent years, with the rapid development of urban rail transit, number of cases like tunnel excavation through existing line grows rapidly. The ground settlement caused by the excavation will lead to the deformation of the track structure, which inevitably effects the operation and safety of the whole line. Currently, shield excavation becomes an important method in the construction of city subway. The following factors cause the ground movement in shield excavation:shield diameter, shield depth, the property of soil and construction conditions, etc. In this paper, it has taken the earth pressure balance shield tunneling machine as an example, using integral analysis method. By the general-purpose finite element analysis software ABAQUS, it builds the whole model of soil, track bed,subgrade and the track. The process of shield excavation was simulated with the reasonable parameters. Following are the main research findings:(1) Comparing the basic rules of track structure deformation in the excavation process with different shied conditions which includes shied diameter, depth and one tunnel excavated in advance, it proposes some reasonable construction suggestion.(2) The vertical vehicle-track coupling model was built to analysis the impact on dynamic characteristics of the track and vehicle running behavior caused by the excavation static irregularity from the excavation. The mainly analysis objects are the vertical acceleration of rail and vehicle,the dynamic displacement of rail and the wheel-rail contact force. It also gives some operation suggestions.更多还原