Development of 3D Subsurface Models for Landslide Investigation Using Spatial Interpolation Technique

Landslides events in Malaysia are often triggered by rainfall due to the tropical climate which has resulted in large numbers of casualties and massive economic losses. To prevent this disastrous events, subsurface investigation is essential to facilitate slope characterization and establish effective slope stabilization measures. This paper presents the integration of borehole drilling, electrical resistivity and seismic refraction method to characterize a residual soil slope in Malaysia. Borehole drilling was used to obtain soil stratigraphy, to locate groundwater level and to obtain undisturbed soil samples for geotechnical laboratory testing. The electrical resistivity method was adopted to measure resistivity distribution of the subsurface materials while seismic refraction method was used to measure the travel time of seismic waves refracted at the interfaces between subsurface layers of different velocities.