Landslide Influence Zone: a Hidden Hazard


Continuing urbanisation brings construction into landslide prone areas. Since 1940s it has been understood that earth pressures acting on the structures within the sliding body may significantly differ from those in the stable slopes. Design codes reflect this knowledge and recommend application of landslide pressures for construction in permanent landslides. It is less clear, however, what kind of design pressures should be used outside of the sliding body in the landslide proximity. This question is relevant for both permanent landslides and one-time events. Of particular practical interest is the area just below the lower boundary of the landslide compression zone. Intuitively, there should be a transition zone, within which high landslide pressures subside to the regular (at rest) earth pressures in the stable slope. This presentation attempts to determine dimensions of this “landslide influence zone” and the lateral earth pressures within it, providing some insights for design considerations.