利用高密度电阻率法确定滑坡面研究

高密度电阻率法探测是滑坡面探测的有效手段，而适宜的现场工作方案和相应的资料解译模型是获取可靠探测成果的前提。针对高密度电阻率法探测中常用的4类电极排列方式，即温纳、施龙贝格、偶极、二极装置，利用有限元方法二维正演模拟建立了均质土坡滑面、软弱夹层滑面、堆积层滑面、构造破碎带滑面的标准地电模型剖面；明确了进行不同类型滑坡工程地质调查时不同电测装置的探测能力和视电阻率异常模式；提出了复杂地质条件卜斜坡问题探测数据有效处理的设计比值参数方法。最后给出2个利用高密度电阻率法进行滑坡工程地质调查的典型研究实例。

APPLICATION OF MULTI-ELECTRODES ELECTRICAL METHOD TO DETECTION OF SLIDE-FACE POSITION

Multi-electrodes electrical method(MEM) is an effective tool for landslide survey,and the suitable in-situ working scheme and its data analyzing model are the base to obtain believable results. The ideal electrical models are given to figure slide-face in homogeneous soil slope,soft interlayer,and geological structure. Two dimensional apparent resistivity sections are formed with finite element method corresponding to four kinds of routine in-situ data collecting arrays,which are Wenner array,Schlumberger array,dipole-dipole array and pole-pole array. The ideal electric array and abnormal resistivity pattern are determined by analyzing the sections. An innovative data interpretation procedure for locating slide-face position in complex geological conditions is propoped,and a series of case study for slope survey with MEM are made. By analyzing the study result,it is shown that dipole-dipole array and Schlumberger array have the stronger exploration capabilities,and pole-pole array can explore the object inside wider area than other arrays with the same electrode. The apparent resistivity patterns of different types of landslide are different even if the landslide is investigated with the same electrical array. The ration parameter method can improve the capability of two dimensional apparent resistivity section to reflect the distribution of object inside landslide.