INITIATION AND TRAVELING MECHANISMS OF THE MAY 2004 LANDSLIDE—DEBRIS FLOW AT BETTOU-DANI OF THE JINNOSUKE-DANI LANDSLIDE, HAKU-SAN MOUNTAIN, JAPAN

SOILS AND FOUNDATIONS

FAWU WANG¹  KYOJI SASSA¹ 

[1] Research Centre on Landslides, Disaster Prevention Research Institute, Kyoto University

关键词: case study;    fluidization;    grain-crushing;    groundwater;    landslide;    ring-shear test;    (IGC: D6);   

DOI  :  10.3208/sandf.47.141

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(14)In May 2004, a landslide occurred at the right flank of the Jinnosuke-dani landslide, and transformed into a debris flow after fluidization. By analysis of the monitored video images of the debris flow, field investigation on the source area of the landslide, and a series of simulation tests with a ring-shear apparatus on the initiation of the rainfall-induced landslide and its traveling process, the initiation and traveling mechanisms of the debris flow traveling in the valley were investigated. It is shown that concentrated groundwater flow was the main reason for the landslide initiation, and a rapid decrease of the mobilized shear resistance even under naturally drained condition caused the rapid landslide motion. During the debris motion in the valley, high potential for grain-crushing of deposits in upstream and lower potential for the downstream deposits controlled the traveling and depositing processes of the debris flow. Different grain-crushing potential of the valley deposits played an important role in the debris flow traveling and depositing processes.

【 授权许可】

Unknown