摘要
Abstract
In consideration of the metro design and operation in Guangzhou, this paper establishes a finite element model analyzing monolithic track bed of underground line, analyzes the stress state of upper and lower surface of track slab. Finally, it presents the proper schemes with regard to the mesh reinforcement setting there, the design relating to connection between tunnel structure and the track bed in non-shielding section, applied types of railway sleeper and drainage way, etc.
The analytical result shows that with action of live load of train, upper and lower surface of track slab may be in tension or compression in both longitudinal and lateral directions, as a result, it is appropriate for the slab to be provided with double layer of reinforcement. The length of sleeper has little effect on slab stress and stress is increasing as the increase of the width of sleeper. For the underground monolithic track bed, besides convenient construction and dimensions required by fasteners anchoring shoud be guaranteed, small-size reinforced concrete long sleeper is recommended. In order to prevent water seepage at deformation joint on the bottom plate, in track bed design, the connection between track bed and foundation shall be strengthened with drainage and water guiding measures so that accumulated water could be led into the bed surface or drainage ditch timely and effectively. Herein bilateral drainage ditch is recommended. In order to solve poor drainage at the ditch just outside the circular tunnel, the structural height of the track may be increased properly to enlarge section size of the ditch at this segment. The height is advised to be increased to 780 mm.关键词
城市轨道交通/地下线整体道床/探讨Key words
urban track transportation/ underground monolithic track bed/ discussion on related design scheme分类
交通工程
