RD1500型探地雷达在滨海地区暗渠摸查中的应用

Application of RD1500 Ground Penetrating Radar to Culvert Survey in Coastal Area

为推动湛江生态崛起,湛江市进行了中心城区水系综合治理。在建设实施过程中,发现有13条暗渠需要清淤。为了更好、更快的对暗渠进行内部清淤及施工,应先进行暗渠线路的摸查,然而暗涵一般位于地下,仅凭观察难以准确定位地下暗渠走向。为顺利推动湛江市滨海地区暗涵摸查工作,使用了无损、快速的探地雷达技术。文章重点介绍了RD1500型探地雷达的工作原理、技术指标、结构组成并给出了其在滨海地区暗涵摸查工程中的应用实例。基于RD1500型探地雷达的新式管线摸查方式无需钻孔,不会对土体以及地下结构产生破坏,而且因其无需动土故探测效率远高于传统方法。探地雷达探测图像在暗渠处差异明显,可准确确定暗渠等目标的位置。因为管线周围介质与时间的不确定性明显,在探测时应选择有利于探地雷达工作的时段。

In order to promote the ecological rise of Zhanjiang city, Zhanjiang city has carried out comprehensive management of the central urban water system. During the process of construction, 13 culverts were found to be in need of dredging. In order to better and faster internal dredging and construction of culvert, culvert line should be explored first. However, culvert is generally located underground, and it is difficult to accurately locate the direction of underground culvert only by observation. In order to promote the dark cultwork in the coastal area of Zhanjiang city, the non-destructive and fast ground penetrating radar technology was used. In this paper, the working principle, technical index and structure composition of RD1500 GPR are introduced, and its application example in the dark culvert exploration project in coastal area is given. The new pipeline detection method based on RD1500 GPR does not require drilling, does not cause damage to soil and underground structure, and because it does not need to move soil, the detection efficiency is much higher than the traditional method. The GPR images are obviously different in the culverts, which can accurately determine the location of culverts and other targets. Because of the obvious uncertainty of the medium and time around the pipeline, the detection time should be selected to be favorable to the operation of GPR.