高速铁路线下结构典型病害分析及快速无损检测方法研究  

Typical defects' analysis and nondestructive detection method for undertrack structures of high speed railways

作　　者：钟鹏飞[1] 车爱兰[1] 冯少孔[1] 张腾瑜 ZHONG Pengfei CHE Allan FENG Shaokong ZHANG Tengyu(School of Naval Architectural, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, Chin)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《振动与冲击》2017年第11期154-160,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(11372180);中国铁路总公司科技研究开发计划重大课题(2013G004-A-1)

摘　　要：随着我国高速铁路运营时间的增长和运营里程的加大,高铁线下结构出现了贯穿裂缝、层间离隙、脱空汲水等病害现象。其中CA砂浆层由于施工工艺、高速荷载及负压等影响出现了较普遍的层间离隙现象,局部还存在离缝及破损等病害,此类病害有可能引起列车振动的增大、噪音以及高速行驶时的安全隐患。针对高铁线下结构CA砂浆层病害的特点,基于弹性波在多层介质中的传播特性,结合现场可操作性以及检测速度的要求,提出了一种基于弹性波的检波器阵列式组合的快速检测方法。通过三维有限元数值模拟以及现场测试,对该方法的关键技术问题,包括评价标准、检测精度以及检测效率进行了研究。结果表明该方法可有效检测CA砂浆层层间离隙的空间分布,具有数据采集方便、检测速度快、检测精度高等优点。Along with the fast growth on operation time and mileage of China＇s high-speed railway, its underline structures have appeared many diseases and defects, such as through cracks, segregations, voids and so on. Due to the primary defaults on construction and negative pressure in operation, the segregations are universally appeared in CA mortar layer and what’s more, serious cracks and damages are exited in somewhere. These mentioned defects will lead to overlarge vibration and safety problems on running carriages. Aimed at the characteristics of defects in CA mortar layer, a combination rapid detection method of three-dimensional array is developed based on the elastic wave propagation in multi-layer medium. By three-dimensional finite element simulation and field tests, the key technical problems of this method are studied, including evaluation standard, detection accuracy and efficiency. The results show that this method is feasible for detection on segregations and defects in CA mortar, as well as its advantages on convenient data acquisition, good testing speed and high precision.

关 键 词：高速铁路 CA砂浆层 层间离隙 弹性波 快速检测方法 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3