[1]武贤龙,包小华,陈湘生,等.基于gprMax的衬砌脱空三维正演分析[J].深圳大学学报理工版,2023,40(2):127-135.[doi:10.3724/SP.J.1249.2023.02127]
 WU Xianlong,BAO Xiaohua,CHEN Xiangsheng,et al.3D forward modeling analysis of lining void detection based on gprMax[J].Journal of Shenzhen University Science and Engineering,2023,40(2):127-135.[doi:10.3724/SP.J.1249.2023.02127]
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基于gprMax的衬砌脱空三维正演分析()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第40卷
期数:
2023年第2期
页码:
127-135
栏目:
土木建筑工程
出版日期:
2023-03-15

文章信息/Info

Title:
3D forward modeling analysis of lining void detection based on gprMax
文章编号:
202302001
作者:
武贤龙 包小华 陈湘生 沈俊 崔宏志
深圳大学土木与交通工程学院,滨海城市韧性基础设施教育部重点实验室,广东深圳518060
Author(s):
WU Xianlong BAO Xiaohua CHEN Xiangsheng SHEN Jun and CUI Hongzhi
College of Civil and Transportation Engineering, Key Laboratory for Resilient Infrastructures of Coastal Cities MOE, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China
关键词:
隧道工程三维探地雷达无损检测时域有限差分衬砌脱空正演模拟波场分析
Keywords:
tunnel engineering three dimensional ground penetrating radar non-destructive detection finite difference time domain lining void forward analysis wave field analysis
分类号:
U452.11
DOI:
10.3724/SP.J.1249.2023.02127
文献标志码:
A
摘要:
衬砌脱空是一种常见的施工缺陷,会导致结构的劣化,降低隧道的安全性,需要在施工及运营阶段对隧道衬砌进行检测.利用基于时域有限差分法的gprMax软件,建立含脱空的隧道衬砌模型,对三维探地雷达的衬砌检测过程进行正演模拟,获取脱空的三维数据体.对脱空的响应特征进行分析,讨论了脱空对电磁波波形及波场分布的影响,结合工程实例验证了正演结果的可靠性.结果表明,脱空区电场强度随测线靠近中心而增强,依据这种变化可实现对脱空三维尺寸的探测;电磁波在脱空内部产生多次反射,引起围岩层中电磁波信号的多次震荡;金属部件会对脱空区信号产生较强的干扰,电场极值从大到小依次为无金属部件、单层钢筋网和双层钢筋网.研究结果对于推动三维探地雷达在隧道衬砌脱空检测中的应用,提高脱空检测的准确性具有参考价值.
Abstract:
Lining void is a common defect in tunnel construction, which might lead to the deterioration of tunnel structure and reduce tunnel safety. It is necessary to detect the tunnel lining in the stages of construction and operation. In this study, a three dimensional (3D) model of tunnel lining and surrounding rock is established based on finite difference time domain (FDTD) method, and the application of 3D GPR (ground penetrating radar) in lining detection is simulated forward to obtaine the 3D GPR data of void. The response characteristics of void in different measuring lines are analyzed, the influence of lining void on electromagnetic waveform and wave field distribution are discussed. Finally, the reliability of the forward modeling result is verified by a tunnel project. The results show that the electric intensity of void area increases as the measuring line is close to the center, and the three dimensions of void can be detected according to this change. In addition, the electromagnetic wave is reflected many times in the void, causing the concussion in the surrounding rock layer. Besides, the metal parts will cause strong interference to the signal of the void, and the extreme values of the electric field are metal-free parts, single-layer steel and double-layer steel in order from large to small. This study will provide valuable reference for promoting the application of 3D GPR in lining void detection and improving the accuracy of detection.

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备注/Memo

备注/Memo:
Received: 2021- 12-28; Revised: 2022-11-03; Accepted: 2022-12-10; Online (CNKI): 2023-02-07
Foundation: National Key R & D Program of China (2019YFC1511104); Peacock Team Plan of Shenzhen (KQTD20200909113951005)
Corresponding author: Professor BAO Xiaohua. E-mail: bxh@szu.edu.cn
Citation: WU Xianlong, BAO Xiaohua, CHEN Xiangsheng, et al. 3D forward modeling analysis of lining void detection based on gprMax [J]. Journal of Shenzhen University Science and Engineering, 2023, 40(2): 127-135.(in Chinese)
基金项目:国家重点研发计划资助项目(2019YFC1511104);深圳市孔雀团队计划资助项目(KQTD20200909113951005)
作者简介:武贤龙(1995—),深圳大学博士研究生.研究方向:深层地下结构抗震韧性.E-mail: szu_wxl@163.com
引文:武贤龙,包小华,陈湘生,等.基于gprMax的衬砌脱空三维正演分析[J].深圳大学学报理工版,2023,40(2):127-135.
更新日期/Last Update: 2023-03-30