The Relation between Types of Landslide Surface and Dynamic Properties

Abstract

According to the results of the exploration of slide surface by the test pits, it was proved that the slide surface could be classifed into two types-the shearing type and the frictional type. Of these two types the shearing type used to be called “the slide surface”, and on constants of the shearing strength a report has already been made.The slide surface of the frictional type is the surface on which thin water layer works as a lubricating agent. So, in layers, such slide surfaces exist discontinuously with their angles of friction being very small and the surfaces unsteady.On the other hand, the slide surface of the frictional type isn't affected by the pore water pressure, and so when the slide surface of this type is distributed in the layers, the landslide occurs only when the pore water pressure works on the part of the slide surface of the shearing type.