De-layer Observation Technique and Application in Complex Landslides

Landslide surveys and preventative analysis have shown that underground water is a sensitivity factor of landslide stability analysis. Therefore, it is important to obtain the underground water level at the site of a landslide. There are different types of underground water levels which this paper refers to as the de-layer underground water level in landslides, due to multiple substance composition and diverse permeability. The water level of a terminal borehole is synthesis level for borehole, and cannot distinguish multi-underground water levels by itself. The de-layer technique of underground water observation could solve the above problems. This paper introduces the systematic de-layer technique of underground water observation and analyzes the results and significance for landslide prevention using the examples of the Heping square landslide and the Huanglashi landslide in the reservoir region of the Three Gorges Project.