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砂防学会誌,Vol.55,No.3,p.12-20,2002
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パイプの存在が斜面崩壊に与える影響の実験的検討
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Examination of the influence of soil pipes on slope failure
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論文
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多 田 泰 之* 奥 村 武 信** 久保田 哲 也***
Yasuyuki TADA, Takenobu OKUMURA and Tetsuya KUBOTA
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Abstract
Soil pipes developed in the forest slope function as collector and/or drain of soil water and play an important role in the runoff process. Soil pipes often detected on the collapsed slope suggest that these pipes influence the slope stability. However, this problem has not been examined in detail. In this paper, the influence of the soil pipes on slope stability is examined using the model slopes with a simplified pipe system and artificial rainfall equipment. Studies on the change in runoff components and pore water pressure and the characteristics of soil mass movement are summarized as follows:(1)While pipe system function as a drain system, the pore water pressure is depressed and the slope increases stability;(2)When the pipe system is plugged, the pore water pressure in the vicinity of the plug is elevated and the slope becomes unstable;(3)The position of the deepest slip plane corresponds to the highest elevation in the pore water pressure;(4)When the pipe system is plugged after the pore water pressure become steady, the soil mass moves rapidly and to a distance.
Key words:soil pipe, pore pressure, surface failure, slope stability
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砂防学会誌 Vol.55 No.3(242)September 2002
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