2012 Fiscal Year Final Research Report

Mechanisms of long travelling Aratozawa Landslide on gentle sliding surface in consolidated silt

Research Project

Project/Area Number	23658136
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Forest science
Research Institution	Forestry and Forest Products Research Institute
Principal Investigator	OKADA Yasuhiko 独立行政法人森林総合研究所, 水土保全研究領域, 主任研究員 (50360376)
Project Period (FY)	2011 – 2012
Keywords	崩壊 / 地すべり / 土石流
Research Abstract	Skeletal structure in soil from a sliding surface of Aratozawa Landslide was investigated to reveal the sliding mechanisms using Cryo-SEM. Many cylindrical and latticed grains were found in silt stone that formed the sliding surface of the landslide, while those were not found in the tufa that overlay the silt. Crushing of cylindrical and latticed grains was likely leading to pore-fluid pressure build-up resulting in the long travelling distance (300m) on the gentle slope (< 4 degrees) of the Aratozawa Landslide.

(3 results)