地铁预制板轨道自密实混凝土充填层受力分析

Stress analysis of self-compacting concrete filling layer of metro precast slab track

文章以深圳地铁14号线板式轨道自密实混凝土充填层施工为背景,对地铁预制板轨道自密实混凝土结构受力进行分析,建立轨道结构ANSYS 有限元仿真模型,对自密实混凝土基本性能参数进行测试,计算地铁预制板轨道动静态受力。结果表明:14 号线自密实混凝土充填层最大压应力、最大剪切应力均分布在轨道板承轨台下方,最大压应力为 0.068 MPa,小于自密实混凝土层的 2 天抗压强度16.3 MPa;最大剪切应力为0.173 MPa,小于自密实混凝土层与轨道板的 2 天黏结强度 0.335 MPa;浇筑 2 天后自密实混凝土充填层即满足轨道车通行条件;建议 3 天后进行轨道车作业。相关研究对预制板轨道施工有较强的指导意义。

Based on the construction of self-compacting concrete filling layer of metro slab track of Shenzhen metro line 14,this paper analyzes the stress of self-compacting concrete structure of metro precast slab track,establishes the ANSYS finite element simulation model of track structure,tests the basic performance parameters of self-compacting concrete,and calculates the dynamic and static stress of metro precast slab track.The results show that the maximum compressive stress and maximum shear stress of the self-compacting concrete filling layer of line 14 are distributed under the track bearing platform,and the maximum compressive stress is 0.068 MPa,which is less than the self-compacting concrete layer 2 days’ strength by 16.3 MPa.The maximum shear stress of self-compacting concrete filling layer is 0.173 MPa,which is less than the 2 days’ bonding strength between self-compacting concrete layer and track slab by 0.335 MPa.Two days after pouring,the filling layer self-compacting concrete meets the traffic conditions of railcars.It is suggested to run railcar operation after three days.This paper has strong guiding significance for the construction of precast slab track.