探地雷达在临海市古长城内部结构检测中的应用分析

doi:10.11720/wtyht.2024.0091

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Abstract

Non-destructive testing of the internal structural characteristics of ancient buildings is the key to preserving cultural relics.To determine the structures and internal defects of the ancient Great Wall in Linhai City,this study performed non-destructive testing of the wall structures in different orientations using a ground-penetrating radar (GPR) combining 100 MHz and 270 MHz antennas.The testing results show significant structural stratification in the ancient Great Wall.The GPR signal-reflected images reveal clear internal wall defects like pores,cracks,voids,and other hidden dangers.This study demonstrates the reliability of the GPR in detecting structures and defects of ancient walls,there by providing technical support for the structural protection of the ancient Great Wall.

Key words： ancient Great Wall in Linhai City ground-penetrating radar structural testing defect detection atlas analysis

Received: 19 March 2024 Published: 08 January 2025

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	Articles by authors
	Hao YANG
	Jie ZOU
	Dan-Dan CHENG
	Jing-Lan YU

Cite this article:

Hao YANG,Jie ZOU,Dan-Dan CHENG, et al. Application of ground-penetrating radar in detecting the internal structures of the ancient Great Wall in Linhai City[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1741-1746.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0091 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1741

Schematic diagram of the main structure of Linhai Ancient Great Wall

Schematic diagram of GPR detection

因素名称	因素符号	相关公式	符号含义
埋深	h	h= $12$ vt	v—电磁波波速,m/ns t—双程走时,ns
衰减系数	β	$β = 2 π f ε μ 12 1 + σ 2 π f ε 2 - 1 12$	f—电磁频率,Hz μ—介质磁导率,H/m σ—介质电导率,mS/m
介电常数	ε_r	$v = c ε r$	c—光速,3×10⁸m/ns
反射系数	r	$r ≈ ε i - ε i + 1 ε i + ε i + 1$	/
水平分辨率	Δx	$Δ x = 14 12 λ H 0 + 116 λ 2$	H₀—垂直测距,m λ—电磁波波长,m
垂直分辨率	Δh	$Δ h = 14 λ$	/

Key factors of GPR detection principle

Relative permittivity of different media

Antenna frequency and GPR parameter settings for different survey lines

GPR data processing before(a) and after(b) comparison diagram

Detection results of outer wall structural layer

Map of GPR detection results for survey line 1

Map of GPR detection results for survey line 2

Map of GPR detection results for survey line 3

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