探地雷达在多年冻土区特殊结构路基服役状态评价中的应用  

Application of Ground Penetrating Radar in Service Status Evaluation of Special Structure Subgrade in Permafrost Area

作　　者：刘军伟 闫景晨[1] 权磊 田波 LIU Junwei;YAN Jingchen;QUAN Lei;TIAN Bo(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Highway Research Institute of Ministry of Transport,Beijing 100088,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]交通运输部公路科学研究所,北京100088

出　　处：《路基工程》2024年第6期107-112,共6页Subgrade Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(2022-9022);国家自然科学基金项目(52178427);北京市自然科学基金资助项目(8222034)。

摘　　要：选取某高原高速公路(片块石路基、热棒路基和通风管路基)进行无损检测,运用探地雷达技术识别多年冻土区特殊结构路基类型、病害及下部冻土分布情况。结果表明:片块石路基通风层处波形杂乱呈区域化分布,热棒路基具备固定间距窄波幅月牙双曲线特征,通风管路基具备固定间距宽幅双曲线特征;对路基病害进行识别,发现检测段片块石路基部分孔隙被堵塞、热棒路基部分热棒失效、通风管路基存在不均匀沉降;通过路基下部多年冻土人为上限的识别及对比以往勘察数据,显示检测段特殊结构路基下方多年冻土均出现退化现象,多年冻土上限下移。Non-destructive testing was carried out on a highway(rubble subgrade,hot rod subgrade and ventilation pipe subgrade)in a plateau,and ground penetrating radar technology was used to identify the types of special structure subgrade,diseases and the distribution of frozen soil in the permafrost area.The results show that the waveforms at the ventilation layer of the rubble subgrade are disorganized and distributed regionally.The ventilation pipe subgrade has the characteristics of a fixed spacing wide-width hyperbola,and the hot rod subgrade has the characteristics of a fixed spacing narrow-amplitude lunate hyperbola.The subgrade diseases are identified,and it is found that some pores of the rubble subgrade in the tested section are blocked,the ventilation pipe subgrade has uneven settlement,and part of the hot rod subgrade fails.Through the identification of the artificial upper limit of permafrost under the subgrade and the comparison with the previous survey data,it is shown that the permafrost under the subgrade with special structure in the tested section is degraded,and the upper limit of permafrost is moved down.

关 键 词：探地雷达 多年冻土 特殊结构路基 路基检测 图像特征 

分 类 号：U416.1[交通运输工程—道路与铁道工程]