礫石層土石流發生特性之研究

A STUDY ON THE INITIATION CHARACTERISTICS OF DEBRIS FLOW IN GRAVELLY DEPOSITS

10.29417/JCSWC.199305_24(1).0007

林炳森(P. S. Lin)；馮賜陽(T. Y. Feng)；李俊明(C. M. Lee)

土石流 ； 礫石層 ； Debris Flow ； Gravelly Deposits

中華水土保持學報

24卷1期（1993 / 05 / 01）

55 - 64

繁體中文

本研究主要分爲兩部分，第一部分爲：以無限長邊坡穩定分析法爲依據，忽略水流流速之影響，並考慮水流對土體之滲流力，推導出土石流發生之臨界條件。第二部分係以水槽試驗結果驗證此臨界條件對於林口臺地礫石層土石流發生特性之適用性。由試驗結果顯示：於本試驗情況下，有地表逕流之臨界公式可解釋各試體係因沿坡面之推移力大於土體抗剪強度而破壞，證實公式之有效性，惟須加入沖刷作用之影響，方可確切表示礫石層受地表逕流作用而發生土石流之特性。

This study was divided into two parts. Firstly, according to the infinite slope analysis method and considering the influence of seepage force, the critical state of debris flow was conducted. Secondly, the water flume model test was performed to examine the suitability of the critical state of debris flow at Linkou Terrace. The experimental results show that the critical state of debris flow conducted previously is in good agreement with the experimental observations, which can explain that the samples fail because the driving force along the failure plane is larger than the shear strength of soils. The critical state of debris flow may appear more exactly when considering the effect of surface erosion.