基于HHT信号分析的GFRP锚杆锚固质量无损检测方法研究  

Research on non-destructive testing method of GFRP bolts based on HHT signal analysis

作　　者：张景科[1,2] 李凯[3] 张瀚 王南[1,2] 郭青林[4] 赵林毅[4] ZHANG Jingke;LI Kai;ZHANG Han;WANG Nan;GUO Qinglin;ZHAO Linyi(Key Laboratory of Mechanics on Disaster and Environment in Western China,Ministry of Education,Lanzhou University,Lanzhou,Gansu 730000,China;College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou,Gansu 730000,China;China Petroleum Pipeline Corporation,Langfang,Hebei 065000,China;National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites,Dunhuang Academy,Dunhuang,Gansu 736200,China)

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000 [2]兰州大学土木工程与力学学院,甘肃兰州730000 [3]中国石油天然气管道工程有限公司,河北廊坊065000 [4]敦煌研究院国家古代壁画与土遗址保护工程技术研究中心,甘肃敦煌736200

出　　处：《岩石力学与工程学报》2021年第7期1460-1472,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划项目(2020YFC1522200)。

摘　　要：为优化土遗址GFRP锚固体系无损检测信号反演分析过程,采用希尔伯特-黄等信号处理方法,对多种完整锚固和缺陷锚固模型的检测信号进行分析。分析过程中首先通过巴特沃斯滤波法消除检测信号中的噪声,然后对消噪后的信号依次进行傅里叶和希尔伯特-黄变换(HHT)分析。试验发现,该处理方法能较为清晰地识别缺陷和杆底反射信号,从而更精确地反演出缺陷位置和锚固长度。此外,利用完整模型和缺陷模型杆底反射的时间差反演出的空浆缺陷长度也与预设工况相近。研究结果为土遗址GFRP锚固长度和空浆缺陷的位置与大小的反演提供了较为系统的分析方案。Aiming to optimize the retrieval and analysis process of non-destructive testing(NDT)of GFRP anchorage system in earthen sites,the Hilbert-Huang transform(HHT)method was used in this study to analyze the test signals of various intact and defective anchoring models.In the process of analysis,the noise in the detected signal is firstly eliminated by Butterworth filter method,and then the signal after denoising is analyzed by Fourier and HHT methods successively.It is found that this method can clearly identify the defect and the reflection signal of the bottom of the rod,so as to reverse the defect position and the anchorage length more accurately.It is also shown that the pulp defect length,reversed according to the difference of the reflection times of complete and defect models,is accordance with the given conditions.The results provide a systematic analysis scheme for the inversion of the anchorage length of soil GFRP and the location and size of the pulp defect.

关 键 词：土力学 土遗址 GFRP锚杆 无损检测 希尔伯特-黄变换(HHT) 锚固长度 缺陷位置 

分 类 号：TU41[建筑科学—岩土工程]