地质雷达在兰州市北环路滑坡灾害应急勘查中的应用  

APPLICATION OF GEOLOGICAL RADAR IN EMERGENCY INVESTIGATION OF 8.9 LANDSLIDE DISASTER ON NORTH RING ROAD IN LANZHOU CITY

作　　者：陈芳 CHEN Fang(Gansu Scientific Information Center of Geology and Minerals,Lanzhou 730000,China)

机构地区：[1]甘肃地矿科技信息中心,甘肃兰州730000

出　　处：《甘肃地质》2024年第4期76-83,共8页Gansu Geology

摘　　要：近年来随着极端气候事件的不断增加,由此造成的地质灾害也在逐年加剧,尤其是滑坡灾害,由于其隐蔽性、突发性强,成因复杂,往往对人民生命财产安全构成严重威胁。针对滑坡灾害,如何快速、有效查明滑坡体厚度、物质组成、地下水埋藏、分布特征等基础参数,是判别滑坡稳定性、研判发展趋势的基础,更是应急处置工作中的关键环节。为此,本文选取兰州市北环路8·9滑坡,采用地质雷达对滑坡体进行快速勘探,并辅以常规的钻探手段予以验证,研究地质雷达技术在滑坡勘查中的实际效果。研究认为:(1)地质雷达探测的滑坡体厚度与钻孔揭露的滑体体厚度误差在毫米级,在拥有较高的探测精度的同时,还具有操作简单、数据高速传输、携带便捷等特点;(2)鉴于黄土地区多为上部黄土,下部泥岩、砂岩的二元结构复合型斜坡,上部黄土层多较为松散,孔隙较大,下部泥、砂岩多较为致密,质地较为坚硬,其上、下部分土体密度、孔隙率变化明显,有利于地质雷达电磁波波率回弹反射和效果量化,可有效应用在黄土滑坡灾害应急处置中。In recent years,with the increasing number of extreme weather events,geological disasters caused by them have been worsening year by year,especially landslide disasters.Due to their concealment,suddenness,and complex causes,they often pose a serious threat to people's lives and property safety.How to quickly and effectively identify basic parameters such as the thickness,material composition,groundwater burial,and distribution characteristics of landslide disasters is the basis for judging landslide stability and assessing development trends,and is also a key link in emergency response work.Therefore,this article selects the 8.9 landslide on the North Ring Road in Lanzhou City and uses geological radar to quickly explore the landslide body,supplemented by conventional drilling methods for verification,to study the actual effect of geological radar technology in landslide exploration.Research suggests that:the thickness of landslide bodies detected by geological radar has an error of millimeter level compared to the thickness of landslide bodies exposed by drilling,which not only has high detection accuracy,but also has the characteristics of simple operation,high-speed data transmission,and convenient portability;given that the loess areas are mostly composed of a binary structure composite slope with upper loess and lower mudstone and sandstone,the upper loess layer is mostly loose and has large pores,while the lower mudstone and sandstone layers are mostly dense and hard in texture.The density and porosity of the soil in the upper and lower parts vary significantly,which is conducive to the rebound reflection and quantification of the effect of geological radar electromagnetic waves.It can be effectively applied in emergency response to loess landslide disasters.

关 键 词：北环路8·9滑坡 地质雷达 应急勘查 应急处置 兰州市 

分 类 号：P631.3[天文地球—地质矿产勘探] P642.22[天文地球—地质学]