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Research on the Bearing Performance of Prefabricated New Type Subway Track Slab with Basalt Fiber
Urban Rail Transit Pub Date : 2022-11-04 , DOI: 10.1007/s40864-022-00178-7
Dan Liu , Zexu Zhao , Mengdi Wu , Peigang Li , Junqi Li , Xiaoyi Qian

Currently, most ballastless tracks in Chinese subways are traditional cast-in-situ concrete structures, which require long construction progress. In contrast, prefabricated ballastless tracks can greatly reduce the construction period. However, there are few theoretical and experimental analyses on the prefabricated new type of subway slab track. Hence, to study the mechanical properties of the new type of subway track slab, static bending crack tests of one standard slab track and nine prefabricated full-scale track slabs with basalt fiber were carried out in this paper. The influence of the reinforcement arrangement method and the basalt fiber content on the performance of the track slabs was studied. Results showed that with the increase in the basalt fiber content in the range of 0.1–0.3%, the load–strain curve growth rate increased, the stiffness decreased, and the flexural resistance reduced. All the specimens exhibited a linear portion (elastic) and then a nonlinear portion (plastic) followed by flexural failure. During the elastic stage, the basalt fiber helped to improve the rigidity of the track slab. During the plastic stage, the influence of the basalt fiber content on the failure load varied with different reinforcement arrangements. With the reinforcement arrangement F2 and 0.1% basalt fiber content, the specimen had the smallest load–strain curve growth rate and the best overall flexural performance and crack resistance, and its strain was 23.35 με at an elastic limit of 95 kN. The results can provide a reference for the design of the prefabricated slab ballastless track.



中文翻译:

玄武岩纤维预制新型地铁轨道板的承载性能研究

目前,我国地铁无砟轨道大多为传统现浇混凝土结构,施工进度较长。相比之下,预制无砟轨道可以大大缩短工期。然而,关于预制新型地铁板式轨道的理论和实验分析较少。为此,为研究新型地铁轨道板的力学性能,本文对1条标准板式轨道和9条玄武岩纤维预制全尺寸轨道板进行了静态弯曲裂纹试验。研究了配筋方式和玄武岩纤维含量对轨道板性能的影响。结果表明,随着玄武岩纤维含量在0.1-0.3%范围内的增加,载荷-应变曲线的增长率增加,刚度降低,抗弯阻力降低。所有试样都呈现出线性部分(弹性),然后是非线性部分(塑性),随后出现弯曲破坏。在弹性阶段,玄武岩纤维有助于提高轨道板的刚度。在塑性阶段,玄武岩纤维含量对破坏载荷的影响随着不同的加固布置而变化。在配筋F2和玄武岩纤维含量0.1%的情况下,试件的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为95 kN时其应变为23.35 με。研究结果可为预制板式无砟轨道设计提供参考。所有试样都呈现出线性部分(弹性),然后是非线性部分(塑性),随后出现弯曲破坏。在弹性阶段,玄武岩纤维有助于提高轨道板的刚度。在塑性阶段,玄武岩纤维含量对破坏载荷的影响随着不同的加固布置而变化。在配筋F2和玄武岩纤维含量0.1%的情况下,试件的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为95 kN时其应变为23.35 με。研究结果可为预制板式无砟轨道设计提供参考。所有试样都呈现出线性部分(弹性),然后是非线性部分(塑性),随后出现弯曲破坏。在弹性阶段,玄武岩纤维有助于提高轨道板的刚度。在塑性阶段,玄武岩纤维含量对破坏载荷的影响随着不同的加固布置而变化。在配筋F2和玄武岩纤维含量0.1%的情况下,试件的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为95 kN时其应变为23.35 με。研究结果可为预制板式无砟轨道设计提供参考。玄武岩纤维有助于提高轨道板的刚度。在塑性阶段,玄武岩纤维含量对破坏载荷的影响随着不同的加固布置而变化。在配筋F2和玄武岩纤维含量0.1%的情况下,试件的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为95 kN时其应变为23.35 με。研究结果可为预制板式无砟轨道设计提供参考。玄武岩纤维有助于提高轨道板的刚度。在塑性阶段,玄武岩纤维含量对破坏载荷的影响随着不同的加固布置而变化。在配筋F2和玄武岩纤维含量0.1%的情况下,试件的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为95 kN时其应变为23.35 με。研究结果可为预制板式无砟轨道设计提供参考。试样的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为 95 kN 时的应变为 23.35 με。研究结果可为预制板式无砟轨道设计提供参考。试样的载荷-应变曲线增长率最小,整体抗弯性能和抗裂性能最好,在弹性极限为 95 kN 时的应变为 23.35 με。研究结果可为预制板式无砟轨道设计提供参考。

更新日期:2022-11-04
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