基于声发射技术的板式无砟轨道层间离缝演化
陈家璐何越磊路宏遥
Interlayer Cracks Evolution in Slab Ballastless Track Based on Acoustic Emission Technology
CHEN JialuHE YueleiLU Hongyao
-
作者信息:上海工程技术大学城市轨道交通学院， 201620， 上海
-
Affiliation:School of Urban Rail Transportation, Shanghai University of Engineering Science, 201620, Shanghai, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2025.04.028
-
中图分类号/CLCN:U213.2+4
-
栏目/Col:研究报告
摘要:
［目的］板式无砟轨道作为典型的层状结构体系，其层间界面的黏结状态直接影响着列车运行的安全。对此，有必要采用微观宏观结合的方式研究板式无砟轨道层间离缝演化。［方法］制作混凝土-砂浆复合试件，并对部分试件进行植筋锚固。应用声发射技术，开展复合试件界面法向性能试验。利用声发射监测系统对复合试件破坏过程进行全程监测，分别获得层间界面离缝演化过程中宏观上的荷载-时间曲线与微观上离缝出现的声发射累计振铃计数指标。［结果及结论］层间界面发生脱黏破坏过程可分为三个阶段，即界面咬合阶段、离缝稳定扩展阶段及界面失稳破坏阶段；植筋后复合试件层间界面脱黏破坏位移值及脱黏破坏过程中对应的声发射振铃计数均明显增加。通过声发射技术可以对层间界面状态进行科学评价，从宏微观层面上验证了植筋能够有效地增加复合试件界面黏结性能。
Abstracts:
［Objective］ Slab ballastless track is a typical layered structure system, and the bonding state of its interlayer interface directly affects the safety of train operation. Therefore, it is necessary to study the interlayer evolution of slab ballastless track by combining micro and macro methods. ［Method］ Concrete-mortar composite specimens are made and partial are anchored with embedded bars. Acoustic emission technology is used to carry out interface normal performance tests on the composite specimens. The entire failure process of composite specimens is monitored by the acoustic emission monitoring system, and the macroscopic load-time curve during the evolution of interlayer interface cracks and the microscopic acoustic emission cumulative ringing count index of the cracks are obtained respectively. ［Result & Conclusion］ The interlayer interface debonding failure process can be divided into three stages: the interface engagement stage, the crack stable expansion stage, and the interface instability break stage. After rebar implantation, both the displacement value of the composite specimen interlayer interface debonding failure and the corresponding acoustic emission ringing count during the debonding failure process are increased significantly. The acoustic emission technology can be used to evaluate the state of the interlayer interface scientifically, and it is verified from both the macro and micro levels that the rebar implantation can effectively increase the bonding performance of the composite specimen interface.
- 上一篇: 高铁物流运输模式及其可行性
- 下一篇: 上软下硬地层拱柱法暗挖地铁车站施工变形规律研究
过刊浏览
资料下载
友情链接