基于自然电位法的滑坡监测实验研究

Rainfall is one of the critical factors to induce landslides, therefore understanding the process of rainwater infiltration and dynamic evolution of groundwater level is meaningful to the monitoring and early warning of landslides. Based on the electrokinetic mechanism, the pore water flow could produce self-potential (SP) responses. Examining the subsurface hydrodynamic process through the observed SP data may deliver insights for the monitoring and early warning of landslides. Relying on an indoor landslide experiment with imposing artificial rainfall to stimulate the rainwater infiltrating the slope, this work synchronously measures the variations of SP, pore-water pressure inside the slope, and the deformation variations at the slope surface. The experimental results show that (1) the SP response is evidently related to the pore pressure variation, which could reflect the evolution of the water flowing patterns inside the slope, and (2) the deformation of the slope surface occurs after the lower part of the slope reaching saturation, which means the surface deformation lagging behind the SP and pore water pressure changing. Our observations indicate that the SP method has great potential application in the monitoring of landslides.