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隧道建设(中英文) ›› 2019, Vol. 39 ›› Issue (8): 1284-1292.DOI: 10.3973/j.issn.2096-4498.2019.08.009

• 研究与探索 • 上一篇    下一篇

冲击回波法精细探测公路隧道衬砌空洞的模型试验及分析

方晓正1, 2, 薛亚东1, 2   

  1. (1. 同济大学岩土及地下工程教育部重点实验室, 上海 200092; 2. 同济大学地下建筑与工程系, 上海 200092)
  • 收稿日期:2019-04-15 修回日期:2019-07-15 出版日期:2019-08-20 发布日期:2019-09-04
  • 作者简介:方晓正(1994—),男,广东普宁人,同济大学土木工程专业在读硕士,研究方向为岩石隧道安全及风险。 Email: fxzharry@foxmail.com。
  • 基金资助:

    上海市科学技术委员会资助项目(18DZ1205902)

Experimental Analysis of Refined Detection of Void behind Tunnel Lining Using ImpactEcho Method

FANG Xiaozheng1, 2, XUE Yadong1, 2   

  1. (1. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,  Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China)
  • Received:2019-04-15 Revised:2019-07-15 Online:2019-08-20 Published:2019-09-04

摘要:

为研究空洞缺陷尺寸以及监测点和震源点的位置对检测结果的影响,根据冲击回波法的特点,设计并进行一系列空洞直径不同时混凝土板的检测试验,模拟检测公路隧道衬砌的壁后空洞。采用快速傅里叶变换分析振动加速度信号,研究应力波的频域信号特征,以探索冲击回波法探测衬砌空洞的可能性与机制。试验结果表明,冲击回波法在探测衬砌空洞缺陷中显示出较为良好的检测效果,影响检测效果的因素主要包括空洞缺陷直径、测点布置和激振位置等。

关键词: 公路隧道, 冲击回波法, 隧道衬砌, 壁后空洞, 傅里叶分析

Abstract:

The influence of void size, the location of monitoring points and vibration source points on the detection results is very important. Hence, a series of detection tests on concrete decks with defects of various diameters are designed and carried out to simulate and dectete the void condition behind tunnel lining based on the characteristics of impactecho method. In order to explore the possibility and mechanism of detecting lining void by impactecho method, the fast Flourier transform (FFT) method is employed to analyze the vibration acceleration signal; and the characteristics of frequency domain signal from stress wave are studied. The experimental results show that the impactecho method performs well in detection of lining void condition; and the main factors affecting the detection effect include void diameter, arrangement of monitoring points and location of seismic source.

Key words: highway tunnel, impactecho method, tunnel lining, void behind lining, Fourier analysis

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