摘要
地下工程施工对道路路基破坏产生的地下空洞等病害是导致城市道路路面坍塌事故频发的主要原因,探地雷达(GPR)以其无损、快捷以及浅层高分辨率的优势被广泛应用于道路地下病害检测中。针对目前GPR技术在地下病害一次性检测中存在的环境干扰严重和检测精度低的问题,提出了一种基于差值检测的道路地下病害检测方法。首先通过差值检测算法对配准后的不同时相雷达图像进行差值处理,识别出变化区域即病害可能出现区域,然后利用改进的核匹配追踪算法,识别并提取道路病害特征。根据回波波组形态、振幅和相位特性、吸收衰减特性等方面特征,初步建立地下病害属性划分标准,进而将不同种类病害分级以指导施工修复。对北京四环路部分路段进行应用实验,结果表明:该检测方法有效提高道路地下病害的检测精度至80%。该方法可实现道路病害检测由一次性检测技术向周期性监测技术的转换,为保障城市道路和地下管线安全提供有效的技术支撑。
Currently,the collapse accidents of the urban roads occur frequently because of underground disease,caused by underground construction,and the GPR technology is widely used in roadbed disease detection for its non- destructive,fast and shallow high- resolution advantages. To solve the problems of the environmental interference and low detection accuracy in one- time detection,a underground disease detection method based on the difference detection was proposed. Firstly,the difference detection algorithm is used to implement difference processing between the radar images with different time,which have been done the image registration,and the changing areas are identified,which are the possible disease area. Secondly,the road disease characteristics can be identified and extracted according to the improved kernel matching pursuit algorithm. Thirdly,the classification criteria of the underground disease property is established based on the wave form,amplitude,phase,and the absorption and attenuation characteristics,resulting in the different grade of the different diseases,and the classified results can be used to guide the repair construction. The application experiment is conducted in the ring road in Beijing,and the results show that the detection method can effectively improve the disease detection accuracy,which can be up to 80%. With this detection method,underground disease detection can be converted from disposable detection technology to periodic monitoring technology,providing effective technical support for the safety of the urban roads and underground pipeline.
出处
《科学技术与工程》
北大核心
2016年第12期83-88,共6页
Science Technology and Engineering
基金
国家自然科学基金(41504112)
煤炭资源与安全开采国家重点实验室开放课题(SKLCRSM14KFA04)资助
关键词
探地雷达
道路病害
差值检测
核匹配追踪
病害特征
GPR
road disease
difference detection
nuclear matching pursuit
disease features
