On the mechanism of the movements of the metamorphic rocks landslide : Mainly on the relationship between the ground water flow and the landslide movement

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  • 結晶片岩型地すべりの移動機構の研究 : 特に地下水流と移動の関係について
  • ケッショウヘン ガンケイ ジスベリ ノ イドウ キコウ ノ ケンキュウ トクニ

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Abstract

The authors have done many kind of researches on the Zentoku landslide in Tokushima Prefecture, and they have found an interesting fact on the influence of ground water level for lanndslide movement observed by pipe strain meters. Namely it has been found that the ground water level does not necessarily have an essential effect on landslide movement, and supplementally the ground water level also does not always correspond to the precipitations. It is well known through the existing researches that landslide movement has fairly close relationship with the ground water level, therefore landslide starts to move when the ground water level ascends over a certain level and it does not move when the ground water level is below the level. The reasons why ground water level has an essential influence on the landslide movement are considered to be the followings; The shearing strength of clay decreases with the increase of the water content in it, and it decreases also with the decrease of effective stress caused by the rising pore pressure. However, the landslide movement in Zentoku does not always correspond to the ground water level. The reason of the landslide, therefore, cannot be explaind by the usual idea. To give some solution to this problem, the authors have established a following new hypothesis from the results of researches that there possibly are rather big voids or openings, and the ground water flows through them with rather big velosity. The fissured or broken rock layers are eroded by ground water flows unceasingly, and voids and openings in the underground are enlarged, as the result of it, the soil mass possibly submits on them sometime. In some case the submission does not cause any other movement, but in some case it possibly causes the landslide movement because the submission decreases the shearing resistance on the vertical and side planes of the landslide mass, by the disturbance or failure of rocks.

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