地表水及地下水對土石流破壞型態之影響
Other Title
The Effects of Surface Runoff and Ground Water on the Occurrence of Debris Flow
Journal
地工技術
Journal Issue
74
Start Page
29
End Page
38
ISSN
1023-0327
Date Issued
1999-08
Author(s)
王幼行
Abstract
本文以水槽物理模型試驗，探求不同之供水模式對土石流發生之影響。供水模式一由水槽頂端供水，以印證高橋（Takahashi）的理論以逕流所增加之剪切力引起土體推移滑動。另一由水槽底部供水，即印證地下水由土體底部破碎之岩盤湧升，導致孔隙水壓快速上升，誘發土石流產生的現象。試驗結果顯示，頂部供水時，土體破壞的主因為逕流的沖刷、侵蝕。而由底部供水時，產生較大規模的破壞，破壞的主因為孔隙水壓上升，有效應力降低所致。而不同供水型態之破壞特徵，可提供為驗證現地土石流破壞型態之參考依據。
The objective of this paper is to explore the effects of different modes of water supply on the occurrence of debris flow. The physical model was used with water supplied from the upstream tank to simulate surface runoff, and with water supplied from hoses in the base to simulate the upwelling of ground water. It is found that the debris flow caused by surface runoff has a smaller scale and behaves more like erosion process. The debris flow caused by upwelling of ground water has massive movement and is induced by lowering of effective stress. The characteristics of the two different modes can be used to verify the field conditions with enough field evidences.
Subjects
土石流
水流模式
破壞型態
debris flow
water supply mode
type of failure
Type
journal article