高密度电阻率法和探地雷达在昆明长水国际机场岩溶勘查中的应用

Multi-electrode Resistivity Method and Ground Penetrating Radar(GPR) in the Karst Exploration in Kunming Changshui International Airport

随着机场、铁路等基础设施建设快速发展,岩溶区不良地质现象给工程建设、安全生产和人民群众的生命财产带来了不同程度的威胁。但岩溶发育的不确定性和多样化,使得准确圈定岩溶位置成为解决岩溶的难题之一。近年来,在岩溶勘查中主要采用的物探方法是高密度电阻率法,但在裂隙节理发育地区,岩溶多发育溶蚀带及溶洞,岩溶体积小,高密度电阻率法推断的岩溶体顶、底板埋深存在一定误差。通过高密度电阻率法和探地雷达相结合,在工区先进行高密度电阻率法,在高密度电阻率法异常部位再采用探地雷达进行探测,两种方法各自发挥优点,在勘查中取得了明显的效果。

With the rapid development of construction of airports, railways and other infrastructures, adverse geological phenomena in the Karst region have brought different levels of threat project construction, production safety and people＇s lives and properties. However, the uncertainty and diversity of Karst development has made ac- curate delineation of Karst position become one of the difficulties to solve the Karst. In recent years, geological prospecting method mainly used in the Karst exploration is high density resistivity method （HDRM）. However, in the fissure and joint developed region, the Karst is mostly developed in corroded zone and caves. Because the Karst volume is small, the top and bottom plate buried depth of the Karst body inferred by high density resistivity method have certain errors. By multi-electrode resistivity method and ground penetrating radar （GPR）, in the work area, the prospecting will be realized firstly by the high density resistivity method, and then by the ground penetrating ra- dar in abnormal positions based on the high density resistivity method. The two methods play their advantages re- spectively and have achieved obvious effect in exploration.