铁路隧道整体式衬砌地质雷达检测模拟试验研究  

Simulation Test of GPR Detection of Integral Lining of Railway Tunnel

作　　者：杨艳青[1] 贺少辉[1] 江波[2] 齐法琳[1,2] 刘建瑞[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国铁道科学研究院基础设施检测研究所,北京100081

出　　处：《铁道学报》2012年第9期93-98,共6页Journal of the China Railway Society

基　　金：铁道部科技研究开发计划项目(2008G017-A)

摘　　要：根据我国铁路隧道模筑混凝土整体式衬砌结构,足尺寸施做整体式衬砌试件模型,并设置衬砌背后空洞、回填不密实等典型工况,进行地质雷达检测模拟试验。试验结果表明:地质雷达扫描图能反映各种预先设置的衬砌背后空洞、回填不密实等衬砌异常情况;并出现强反射区、同相轴连续等典型特征;衬砌及衬砌背后回填不密实厚度在准确测定各介质层相对介电常数条件下,能够进行定量分析,检测精度可达±4cm;衬砌背后空洞厚度则可通过其与反射波振幅比的线性关系计算。模拟试验结果可为实际工程地质雷达检测结果定性、定量解释提供参考。According to the prevailing integral lining construction of moulded concrete of railway tunnels in Chi- na, the specimen model of integral lining by the whole size was built and some typical conditions were set such as cavities and uncompacted backfill behind the lining. Ground penetrating radar（GPR） detection and simula- tion were conducted. The test results show as follows： Pre-set lining abnormalities can be reflected in the GPR scan by characteristics typical of the strong reflection zone and a continuous phase axis; the thickness of the lin- ing and uncompacted backfill behind the lining can be analyzed quantitatively under the condition that relative dielectric constants of all dielectric layers are measured accurately, and the accuracy of detection can reach ±4 cm; the thickness of cavity behind the lining can be calculated by its linear relationship with the reflection am- plitude of the back wave. The results are of important reference value to qualitative and quantitative interpreta- tion of GPR detection in actual engineering.

关 键 词：隧道工程 整体式衬砌 地质雷达 模拟试验 

分 类 号：U231.4[交通运输工程—道路与铁道工程]