Movement of the Kokugawa landslide in the snow season of 2012

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  • 2012年積雪期に発生した国川地すべりの運動特性
  • 2012ネン セキセツキ ニ ハッセイ シタ コクガワ ジスベリ ノ ウンドウ トクセイ

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Abstract

The Kokugawa landslide occurred on 7th March 2012 in Joetsu, Niigata Prefecture. To clarify the characteristics of the landslide's movement, we analyzed the form of the landslide movement and displacement based on LiDAR data, aerial photography, field measurements, and trench profiles. The landslide slope was divided into initiation, transfer, and deposition zones. The massmovement type of the landslide was complex earthslide-earthflow, which initially occurred as a rotational slide in the initiation zone, transformed into an earthflow in the transfer zone, and then reached the deposition zone. The velocity of the mass reaching the deposition zone declined to 0.11m/h by 10th March. The movement lasted for 16days due to continuous movement with a velocity of less than 1m/h. The linear movement of the mass along the slope direction at the transfer zone continued after the mass had reached the deposition zone. Deflection and slowdown of the mass did not occur, except at the landslide toe, probably due to the generation of excess pore pressure by undrained loading on the impermeable alluvial clay layer, which caused a significant decrease in shear resistance in the clay layer. Snow in the deposition zone was pushed by the landslide and formed a swelled snow wall around the mass. This suggests that the snow wall confined the lateral spread of the mass in the deposition zone, but the mass did not entrain much snow at its base and interior.

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