地质雷达和高密度电法在岩溶厂址的应用

Application of ground-penetrating radar and high-density resistivity methods in karst sites

工区强岩溶地层为三叠系碳酸盐岩,表现为岩溶管道、溶蚀孔隙、溶洞、溶蚀沟槽等,岩溶发育存在不均一、不规则、发育程度差别大等特点。本次物探工作选用地质雷达、高密度电法两种地球物理勘探方法查明岩溶发育情况。地质雷达方法采用多次覆盖点测法,压制干扰波,增强对地下介质分辨力,其对场地溶蚀槽沟、浅埋无充填溶洞、含水裂隙通道具有较高的分辨率;高密度电法利用三级排列优点,在提高分辨率的情况下,压制反演假异常,其对查明场地内深埋不规则溶洞形态、规模、延展方向有较好的效果。

The strong karst development area are Triassic carbonate rocks,which are characterized by karst pipelines,dissolution pores,karst caves,dissolution trenches,etc.The karst development is uneven,irregular and largely different in development degree.The prospecting in this studyusedtwo kinds of geophysical exploration methods,including ground penetrating radar and high density resistivity methods to find out characteristics of karst development.The method of ground penetrating radar using multiple coverage points to suppress interference waves and enhance resolution of underground media,had a higher resolution on the site dissolution trenches,shallow buried unfilled caves,water containing fracture channel.The method of high density resistivity using the advantages of three pole arrangement to improve the resolution and suppress false inversion anomaly,had a better effect to identify shape,size,extention direction of deep buried irregular cave in the site.