基于轨道振动的CA砂浆层劣化识别研究综述

REVIEW ON THE DETERIORATION IDENTIFICATION OF CEMENT ASPHALT(CA) MORTAR LAYER BASED ON TRACK VIBRATION

CA砂浆层是无砟轨道连接轨道板与底座板的关键结构层,在列车荷载和温度等因素的影响下,CA砂浆层难以避免会出现离缝、脱空等劣化现象,严重时会显著增加轨道的振动响应,影响列车安全运营。文中从理论研究、有限元分析、试验研究3个方面回顾了CA砂浆层劣化对轨道振动的影响研究,综述基于轨道振动的CA砂浆层劣化损伤识别方法,主要包括冲击回波无损检测、探地雷达法、弹性波法、机械阻抗法和传感器检测,以及3种数据处理思路,结构模态参数分析、动力响应和机器学习。最后,在文献调研的基础上对研究现状进行了简要总结,指出了现有研究的不足,并提出了关于CA砂浆层劣化识别方法的思考与建议。

The CA mortar layer is the key structural layer that connects the track slab and the base plate of the ballastless track. Under the influence of train loading and temperature changes, the CA mortar layer may suffer from deterioration such as cracks and voids. In severe cases, it will significantly increase the vibration response of the track system and affect the safe operation of the train. This paper reviews the impact of CA mortar layer deterioration on track vibration from three aspects, which are, theoretical research, finite element analysis, and experimental tests. The identification methods of deterioration damage of CA mortar layer based on track vibration are reviewed,including impact echo nondestructive testing, ground penetrating radar, elastic wave method, and mechanical impedance method, and sensor for detecting. Three data processing ideas are also obtained, which are structural modal parameter analysis, dynamic response, and machine learning. Finally, a brief summary of the research status is concluded based on the literature research. The main shortcomings of the existing research works are listed, and the suggestions for identification method of CA mortar layer deterioration are put forward.