滑坡体高密度电阻率正反演模拟及其在工程抢险中的应用

Forward and reverse modeling of high density resistivity of land sliding and its application in the emergency project

为了选定合适的地球物理勘探手段,在收集工作区前期的资料的基础上进行数值模拟,选取合适的勘探手段及观测系统能够提高工作效率,满足工程抢险的要求。本次研究利用历史钻探资料,通过高密度电法正反演模拟,得到不同地层的电阻率值差异情况,证明了高密度电法在某高速公路滑坡地质灾害抢险勘探中对滑坡面可以进行有效地识别,同时预测该滑坡面位于卵石土和砂泥岩的接触带上,平均深度约6m。以高密度电法在河南省某高速公路滑坡勘探中的应用为实例,利用高密度电阻率法在滑坡地质灾害发生后快速、无损的开展工作,为工程抢险的设计、施工提供基础探测数据、对滑坡发展情况做出合理预测,同时对现场进行的钻孔布设,地质灾害评估提供了指导性意见。

In order to select an appropriate geophysical exploration means,we do the numerical simulation based on prelim-inary data of work area,and then select the appropriate exploration means and observation system to improve efficiency and meet the requirements of the project rescue.Referring to the historical drilling data,the author get resistivity differences in dif-ferent formations by using forward and reverse modeling,which proves the high density resistivity could identify the sliding surface effectively in a highway landslide disaster rescue and exploration and predict this sliding surface locating on the zone-of-contact between gravel soil and sand shale with the average depth of about 6km.Taking the application of the high density resistivity method in a highway landslide survey in Henan Province for example,the author provides the basic data after the landslide disaster for the engineering rescue design and construction by using the high density resistivity method rapidly and non-destructively.At last,we make a reasonable prediction of landslide development while offering the guidance for drilling laid and geological hazard assessment.