高密度电法在毗卢洞石窟地质病害勘察中的应用

Application of High-density Electrical Methods to the Survey of Geo-hazards in Pilu Cave

以毗卢洞石窟保护工程治理工程为背景,介绍了高密度电法的基本原理和方法。结合石窟场区的工程地质条件,采用高密度电法对洞窟岩体裂缝及滑坡病害进行了地球物理勘察,以了解洞窟岩体裂隙的发育程度和滑坡的工程地质、水文地质条件对洞窟及院落地面、建筑变形的影响等,为工程地质勘察、稳定性评估及防治工程设计提供依据。结果表明:柳本真十炼窟岩体和千佛洞岩体裂缝比较发育,在地表水侵蚀风化和植物根系生长劈裂的作用下会进一步发展,对洞窟岩体的稳定将产生严重的影响;影响滑坡稳定的主要因素是呈连通状态的地下水和垂向发育的含水破碎带,且垂向发育的含水破碎带或不同岩性的含水软弱接触带构成滑坡后缘的依附面,对坡体的稳定形成不利影响。

To provide basis for the stability assessment and protection work design of Pilu Cave,high density electri-cal technique was applied to the geophysical prospecting of rock fracture and landslide disaster in the grotto.The effects of fracture development,engineering and hydrologic and geologic conditions on the deformation of grotto and ground surface were explored.Results indicated that rock fractures in the Liubenzhen Sculptures Grotto and Thou-sand Buddha Cave are well developed,and will develop further under the action of surface water erosion and plant’s root growth,posing severe adverse impact on the stability of the cave.Connected groundwater and vertically-devel-oped water-bearing fracture zone are main factors affecting the stability of landslide,and the water-bearing fracture zone together with the weak contact zone of different rocks forms the attachment surface of the landslide’s back edge,which is unfavorable for the slope stability.