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Title: 風化基岩中の選択流を考慮した浸透計算と斜面安定解析
Other Titles: Calculations for Matrix and Preferential Flows within Weathered Bedrock and Slope Stability
Authors: 堤, 大三  kyouindb  KAKEN_id
藤田, 正治  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-9376-2308 (unconfirmed)
SIDLE, Roy C.
林, 雄二郎  KAKEN_name
Author's alias: TSUTSUMI, Daizo
FUJITA, Masaharu
SIDLE, Roy C.
HAYASHI, Yujirou
Keywords: クラック
風化基岩
斜面安定性
リチャーズ式
選択流
fractures
weathered bedrock
slope stability
landslide
Richards' equation
preferential flow
Issue Date: 1-Apr-2005
Publisher: 京都大学防災研究所 / Disaster Prevention Research Institute Kyoto University
Journal title: 京都大学防災研究所年報. B = Disaster Prevention Research Institute annuals. B
Volume: 48
Issue: B
Start page: 631
End page: 637
Abstract: 土層中のパイプおよび風化基岩に発達したクラックを通した選択流が斜面安定性に及ぼす影響を検討するため,土層と大孔隙内の水流に関する水理モデルを用いて数値シミュレーションを行なった。数値シミュレーションにおいて,表土層と風化基岩層からなる斜面を想定し,それぞれに水理特性値を与え,土層および風化基岩層に関する浸透流計算を行なった。結果より,斜面表層に降った雨水が選択流路を通して迅速に基岩深部に輸送され,選択流路が風化基岩内部で閉塞している場合は,その閉塞点近傍の圧力水頭値の急激な上昇をもたらすことが確認された。この圧力水頭上昇によって,斜面が不安定化し,斜面崩壊の危険性が高まることが示された。
Numerical experiments were conducted to assess the effect of preferential flow through pipes and cracks within weathered bedrock on slope stability, using hydrological model in which water flows within both the matrix and macropores. The hillslope consists of soil and weathered bedrock layers. Hydraulic properties were assigned to the weathered bedrock as well as the soil layer, and the regolith flow calculations were conducted within the slopes. Results demonstrated that the preferential flow pathway rapidly transported rainwater to the deeper layer of the slope, and if the outlets of the preferential flow pathway remained within the slope, the pressure head increased around these points. This increase in pressure head caused a decrease in the factor of safety at the deeper layer of the slope.
URL: http://www.dpri.kyoto-u.ac.jp/dat/nenpo/no48/48b0/a48b0p63.pdf
URI: http://hdl.handle.net/2433/26542
Appears in Collections:No.48 B

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