Extracting necessary pparameters from real landslide mass for mitigating landslide disaster

Abstract

This paper introduces ideas for extracting important parameters for landslide risk assessment from real landslide masses. The parameters included velocities estimated from mud spatters and therefore equivalent viscosities of fluidized soil masses. Mud spatters remaining on dwelling walls etc., which often show parabolic patterns, are used to estimate flow velocities. One example shows that the viscosity of a liquefied pyroclastic material is about two to three digits smaller than those obtained from torsional shear tests for sandy soil, indicating high potential for the fluidized volcanic products to travel fast a long distance even on this extremely gentle slope. Geometric parameters describing a deformed shape of a coherent landslide mass indicate ultimate load capacity that the landslide mass can bear. This capacity is less sensitive to the entire length of the landslide mass, and determines the distal reach of the soil mass. © 2007 Springer-Verlag Berlin Heidelberg.