Landslide Investigation of Mountainous Expressway Based on Ultra-High Density Resistivity Method

Ultra-high density resistivity method is a completely new resistivity investigation technique, by laying out electrodes at one time, it can acquire potential information from any combined electrodes, the acquired information is 40 times of the conventional high-density resistivity method, then the section´s resistivity value can be acquired via utilizing 2.5-D inverse analytical method, in this way, the inverse results is more exactly. This paper has applied ultra-high density resistivity method in the landslide investigation of some mountainous expressway, the investigation results indicated this method is effective in determining landslide´s scope, scale, sliding surface location and depth, fault and fracture zone and distribution characters of groundwater, moreover, it has the efficient and convenient advantages, which means it could be employed in the practice of landslide, fault and fracture zone investigation.