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積雪荷重が地すべり地表層の水分浸透特性に及ぼす影響 Effects of Snow Load on Water Infiltration in the Ground Surface Layer of a Landslide

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D02

Effects of snow load on water infiltration properties of the ground surface layer of a landslide

wa a a a a

Hikaru OSAWA, Sumio MATSUURA, Takashi OKAMOTO, Yuki MATSUSHI, Tomomi TERAJIMA, Tatsuya SHIBASAKI We studied the effects of snow load on the ground surface layer of a landslide in areas underlain by Neogene sedimentary rocks. We developed a new testing apparatus and named it consolidation permeability test, which can measure the soil permeability under loading weight conditions. According to the consolidation permeability test result, soil permeability decreased exponentially under loading conditions. Permeability was changed about 0.2 times under a load equal to the maximum water equivalent of snow (22 kN/m2). We assumed that a factor controlling hydraulic conductivity is the volume change of the shallow subsurface region due to the snow load.

N 6 N N m 5 6 ~ 6 N N 5 )3 0 6 N N 0 0 5 6 k O 6 N 6 6 s N ( m N N 6 N (( /,%0( N ( -1.2. ( N 6 N N 5 N

Osawa, H., et al. (2015): Proc. of 10th Asian regional conference of IAEG, Tp1-24

Normal stress (kPa) y=0.75e-0.046x

Kx

/K0 R

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