高铁多层线下结构病害全波场无损检测方法与技术

摘要/Abstract

摘要：

摘要：为了评估全波场无损检测方法在高铁线下结构病害检测中的效果，进行了砂浆层缺陷与路基顶部缺陷2种情况下的三维有限元数值模拟分析，明确弹性波在多层线下结构中的传播特性.开展了预埋缺陷的1∶1的高铁模型试验，通过对采集数据进行分析与处理，评价缺陷的位置及空间分布.结果表明，弹性波在多层结构中传播，遇缺陷时其传播能量增大，卓越特征亦放大.现场检测结果与预埋缺陷位置及空间分布相吻合.这表明在高速铁路多层线下结构病害检测中全波场无损检测方法效果较好，并有巨大的发展空间.

关键词: , 高速铁路, 全波场, 无损检测, 线下结构

Abstract:

Abstract： A full-wavefield imaging detection system integrates the point-source/point-receiver scheme with the multi-directional imaging technique. It is equipped with an impacting hammer, a series of three-component velocity transducers and a signal capturing unit. To evaluate the feasibility of this system for detecting defect of high speed railway under-track structure, a full-scaled highway embankment model test with pre-setting defection was conducted and a 3-D numerical simulation using FEM was performed for comparison and mechanism study. The results are in agreement with the numerical ones on the processed scanning images. It is concluded that the full-wavefield imaging detection method exhibits high potential in inspecting the defects of high speed railway under-track structure by imaging.

Key words: high speed railway, full-wavefield, nondestructive testing； under-track structure

中图分类号:

U 238

汤政1,车爱兰1,冯少孔1，施有志2，范岩旻1. 高铁多层线下结构病害全波场无损检测方法与技术[J]. 上海交通大学学报（自然版）, 2015, 49(07): 1017-1022.

TANG Zheng1,CHE Ailan1,FENG Shaokong1,SHI Youzhi2,FAN Yanmin1. Detection Methods and Research About Full-wavefield Imaging Detection Method on High-Speed Railway Under-Track Structure[J]. Journal of Shanghai Jiaotong University, 2015, 49(07): 1017-1022.

参考文献

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