大地电磁测深法在水电工程勘察中的应用

The Application of Magnetotelluric Methodto the Investigation of Hydropower Engineering

水电工程中常常会遇到深厚覆盖层勘探、滑坡体勘探、隐伏断层调查、岩性界面勘探等问题,常规的钻探、硐探、槽探等手段施工周期长,经费也耗费巨大。而大地电磁测深法具有勘探深度深、精度高、仪器设备轻便等优点,能够在一些地形比较复杂区域进行高效率、高质量的勘探,与有限的钻探、硐探资料互补,获得更丰富的地质信息。通过几个工程应用实例,表明了大地电磁测深法能够在深厚覆盖层勘探、隐伏断层调查、滑坡勘探、岩性界面划分等方面取得很好效果,为后期该方法的进一步推广提供了指导依据。

Many problems such as deep overburden exploration,landslide survey,buried fault investigation,lithologic interface exploration,and so on are often encountered in the hydropower project.Conventional measures including drilling,cave exploration,tank exploration need long construction period and its cost is huge.However,the magnetotelluric method,with the advantages of deep exploration,high accuracy,light equipment,etc,is capable of performing high-efficiency and high-quality exploration in some complex terrain areas and can obtain richer geological information together with the limited data from drilling and exploration.In this paper,a few examples show that the magnetotelluric method can obtain good results in deep overburden exploration,buried fault investigation,landslide exploration and lithologic interface exploration,which provides some guidance for thefurther promotion of this method in the later period.