【作者】 高江宁；

【导师】 刘学毅；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2004， 硕士

【摘要】 随着铁路运输和城市轨道交通的不断发展，有碴轨道体现出了维修工作量大、轨道变形快等缺点。所以世界各国都研究和开发了多种以少维修或不维修为特点的无碴轨道。整体道床就是一种广泛用于铁路隧道、站场、专用线以及城市有轨交通中的无碴轨道。 本文通过利用现有的二重连续弹性基础叠合梁模型和弹性地基梁模型，计算隧道中双侧沟钢筋混凝土支承块式整体道床纵横向最大弯曲应力。进而对扣件刚度、整体道床厚度、扣件间距和围岩基础抗力系数四个参数值进行研究，通过分析比较得出各参数的合理取值范围。 本文通过使用ANSYS有限元软件建立实体模型，对无仰拱和有仰拱两种工况下整体道床应力进行了计算和分析，得出整体道床的受力特点。在将结果与地基梁模型进行了比较后，认为边界条件的差异是两模型计算结果出现差异的主要原因。在计算仰拱上整体道床纵向应力时，二重叠合梁模型对整体道床基础的弹性抗力系数取值是不合理的，同时也没有考虑回填混凝土和仰拱变形的影响。按地基梁模型进行设计安全储备高，建议以后设计计算仍可使用，也可用实体模型进行更细致的应力计算和分析。 为了更好的对仰拱上整体道床受力进行分析，本文提出和建立了四重连续弹性基础叠合梁模型。对三个模型所得结果进行综合比较后，本文建议仰拱上的整体道床纵向应力可以采用二重叠合梁模型和四重叠合梁模型进行计算，也可用有限元软件建立实体模型进行更细致的应力计算和分析，二重叠合梁模型计算时基础的弹性抗力系数采用Ⅱ级围岩的弹性抗力系数。更多还原

【Abstract】 With the development of railway and urban transportation, ballasted track incarnate some shortcomings, such as too much maintenance work, high probability of distortion and so on. So many countries have researched and developed kinds of ballastless track, which could reduce even do not need maintenance work. Track on solid bed is a kind of ballastless track; it is widely used in railway tunnel, terminals, special line and urban railway transportation.In this paper, toward double-side channel reinforced concrete bearing block track on solid bed in tunnel, the maximal moment and bend stress in longitudinal and latitudinal is calculated utilizing existing continuously support double beam model and beam on elastic foundation model. The bend stress is also calculated using the solid model established by a Finite Element software ANSYS. Four parameters such as fastener rigidity, depth of track on solid bed, space between fasteners and resisting coefficient of wall rock foundation are studied and obtained their reasonable value range through analysis and compare.In this paper, the stress of the track slab with and without inverted arch is calculated and analyzed using a solid model established by Finite Element software-ANSYS, and the mechanics characteristic of the track slab is educed. After compare with the result of the foundation beam model, we can say the difference between the boundary condition of the two models is the main cause of the result discrepancy. When calculate the longitudinal stress of the track slab on inverted arch, the selection of the resistance coefficient of the wall rock in double beam foundationmodel is incompatible, and the influence of the distortion of the backfilled concrete and the inverted arch is not taken into account is another defect of the double beam model. This paper advise use foundation model to design because the safety capacity is high, a more detailed analysis can be carried through using solid model if necessary.A quadruple continuously supported beam model is brought forward and established to analyze the track slab on inverted arch more careful. Through the comparison between the three model’ s result, we can draw a conclusion that we can use double and quadruple continuously supported beam model to calculate the longitudinal stress of the track slab on inverted arch, and a more detailed stress analysis can be carried through using solid model established by finite element software if necessary. The foundation’ s elastic resistance coefficient should equal to that of the level II wall rock.更多还原