土壤液化與土石流關係之理論整理

The Relationship between Soil Liquefaction and Debris Flow

洪耀明(Yao-Ming Hong) ； 張庭瑜(Ting-Yu Chang)

《水保技術》 7卷4期 (2012/10) Pp. 222-227

https://doi.org/10.30040/JSWCT.201210.0003

摘要

本研究整理國內外土石流形成機制，首先討論Takahashi（1977;1978）基於無限邊坡觀點下所發展的土石流臨界移動模式，並依地表水位及滲流高度，討論土石流移動之臨界坡度。隨後討論液化啟動土石流之過程，首先歸納土石液化形成基本條件，推得臨界水力坡降；其次討論蘇苗彬及陳育志（2003）所提出之土石流啟動與液化形成條件。最後討論Istomina（1957）因土壤滲流造成之液化現象，並依均勻係數，將液化現象分為液態化及淘刷兩種現象。希望藉由相關研究理論之整理，了解土石流形成之原因。

關鍵字

土石流 ； 土壤液化 ； 臨界坡度

並列摘要

This study collected and summaried the formation mechanism of debris flow. Firstly, based on the viewpoint of infinite slope, the critical movement model of debris flow developed by Takahashi(1977;1978) was discussed. The critical slope of debris flow is obtained by the known surface water level and seepege height. Secondly, the debris flow triggered by soil liquefaction was also discussed. The critical hydraulic gradient was obtained by the conditon of soil liquefaction. The condition of debris flow and soil liquefaction developed by Su and Chen (2003) was also discussed. Finally, the soil liquefaction due to seepage flow developed by Istomina(1957) was discussed. Based on the uniformity coefficients, the soil liquefaction can be classified into fluidization and scouring. Above discussions may be helpful for the understand of debris flow.

並列關鍵字

Debris Flow ； Soil Liquefaction ； Critical Slop