混凝土试块中不同空洞几何形态的地质雷达图像特性测试与分析  

Test and Analysis of GPR Image Characteristics of Geometrical Morphology of Different Voids in the Concrete Test Block

作　　者：王艳辉[1,2,3,4] 丁冠军 崔广炎 李宇杰[6] WANG Yanhui;DING Guanjun;CUI Guangyan;LI Yujie(State Key Laboratory of Advanced Rail Autonomous Operation,Beijing Jiaotong University,Beijing 100044,China;School of Traffic and Transportation,Beijing Jiaotong University,Beijing 100044,China;Beijing Research Center of Urban Traffic Information Sensing and Service Technology,Beijing Jiaotong University,Beijing 100044,China;Research and Development Center of Transport Industry of Technologies and Equipment of Urban Operation Safety Management,Beijing Jiaotong University,Beijing 100044,China;Asset Maintenance Management Department,Beijing Mass Transit Railway Operation Co.,Ltd.,Beijing 100044.China;Department of Technology,Beijing Mass Transit Railway Operation Co.,Ltd.,Beijing 100044,China)

机构地区：[1]北京交通大学先进轨道交通自主运行全国重点实验室,北京100044 [2]北京交通大学交通运输学院,北京100044 [3]北京交通大学北京市城市交通信息智能感知与服务工程技术研究中心,北京100044 [4]北京交通大学城市轨道交通运营安全管理技术及装备交通运输行业研发中心,北京100044 [5]北京市地铁运营有限公司资产维护管理部,北京100044 [6]北京市地铁运营有限公司技术部,北京100044

出　　处：《铁道学报》2024年第10期152-162,共11页Journal of the China Railway Society

基　　金：北京市自然科学基金(L231001)。

摘　　要：根据施工现场隧道无筋衬砌空洞病害情况,构建足尺寸的混凝土试块物理模型,并设置不同几何形态空洞,模拟无筋衬砌空洞病害。利用探地雷达(GPR)检测得到不同龄期、不同天线频率和不同病害对比情况下的空洞病害数据,进行地质雷达图像特性测试与分析。结果表明:混凝土试块中空洞病害检测的最佳天线频率为800 MHz,最佳检测时间为第17天左右;最大幅值A T和电磁波能量E T可作为空洞早期识别的重要特征参数;不同形状空洞的电磁波振幅属性与混凝土龄期关系呈现为“W”形曲线规律;当空洞和不密实病害同时存在时,最大幅值A T更适合不密实病害的辨识研究。本研究可为隧道无筋衬砌空洞及不密实病害的检测和辨识提供理论依据,并为施工现场隧道无筋衬砌空洞病害的检测时间与天线选择提供参考。According to the condition of voids in tunnel unreinforced linings at the construction site,a physical model of a full-size concrete test block was constructed and voids of different geometric shapes were set up to simulate the void defects in the unreinforced lining.Ground penetrating radar(GPR)was used to detect the void defect data under different ages,different antenna frequencies,and different defect comparisons,then the characteristics of the GPR image were tested and analyzed.Results demonstrate that the optimal antenna frequency for void detection of the unreinforced lining is 800 MHz,the optimal detection time is about the 17th day,and the maximum amplitude A T and electromagnetic wave energy E T can be used as important characteristic parameters for voids identification in the early days.The relationship between the electromagnetic wave amplitude properties of voids in different shapes and the concrete age shows a“W”shaped curve rule.When void and uncompacted defects exist at the same time,the A T is more suitable for the identification of uncompacted defects.This study can provide a theoretical basis for the identification of tunnel unreinforced lining voids and uncompacted defects,and provide a reference for the selection of the detection time and antenna of tunnel unreinforced lining voids in the construction site.

关 键 词：地质雷达 物理模型试验 无筋衬砌 空洞病害 特性测试与分析 

分 类 号：U455.91[建筑科学—桥梁与隧道工程]