摘要
交通基础设施在长期服役中易产生空洞等潜在病害,影响结构安全与耐久性。基于gprMax构建多类路基模型,采用三维FDTD正演模拟,系统分析不同介质、空洞尺度与埋深条件下的GPR B-scan响应特征。结果显示:含水空洞顶部与底部均呈典型衍射双曲线,空洞双程时间差可用于反演深度尺寸;空洞内部多次反射叠加显著增强界面反射强度。研究揭示了含水空洞的电磁响应规律,为GPR图像解译及路基病害识别提供理论基础。
Subsurface voids in transportation infrastructure pose risks to structural safety and durability.This study constructs multiple subgrade models using gprMax and performs three-dimensional FDTD forward simulations to systematically analyze GPR B-scan responses under varying media,void sizes,and burial depths.Results show that water-filled voids exhibit typical diffraction hyperbolas at both top and bottom interfaces,and the two-way travel-time difference can be used to estimate void depth.Multiple internal reflections within voids significantly enhance interface reflection intensity.The findings reveal the electromagnetic response characteristics of water-filled voids,providing a theoretical basis for accurate GPR interpretation and subgrade defect identification.
作者
张珠皓
姜凯
Zhang Zhuhao;Jiang Kai(Shandong Urban Construction Vocational College,Jinan Shandong 250000,China;School of Qilu Transportation,Shandong University,Jinan Shandong 250000,China;Shandong High-speed Jinan Development Co.,Ltd.,Jinan Shandong 250000,China)
出处
《山西建筑》
2026年第8期90-94,共5页
Shanxi Architecture
基金
山东省自然科学基金创新发展联合基金:三维探地雷达数据快速智能解译与路基路面隐蔽病害量化判识方法研究(项目编号:ZR2025LZN003)。
关键词
探地雷达
正演模拟
含水空洞
B-scan
Ground Penetrating Radar(GPR)
forward modeling
water-voids
B-scan
