坡地災害引起土石流發生機制之整合研究─總計畫暨子計畫：邊坡破壞引發土石流之機制研究-以土石流源頭為對象(2/2)
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
DOI
922625Z002009
Abstract
ABSTRACT
In recent years, debris flows have caused tremendous damages and
loss of life as well as properties in Taiwan. In order to prevent reoccurrence of
debris flows and to reduce damages by suitable methods, it is very important to
understand the causes and the conditions as flows occurred.
The engineering properties of debris-flow materials, which show
distinctive characteristics in different regions, are important factors that
influence the occurrence of debris flows. In this research, two areas selected to
study are in Taipei County: the Chongher area, located at Chinshan, and the
Houtong area, located at Rueifang. These two sites were attacked by debris
flows during typhoon Xangsen in 2000. Moreover, the geological conditions of
the two sites are distinct from the regions studied in previous researches which
focused mainly on the middle and eastern parts of Taiwan.
The work of this study includes laboratory tests, numerical simulation,
and statistical analysis. The tests are to examine the engineering properties of
the materials, including mechanical and hydraulic properties, for stability
analyses under saturated and unsaturated conditions. The numerical simulation
of the infiltration process utilizes ABAQUS computer program to investigate
the change in slope stability from unsaturated into saturated conditions. The
influencing factors examined are rainfall intensity, rainfall duration,
permeability of soil, gradient of slope, etc. Additionally, numerical results are
compared and comparable with those from limit equilibrium analysis
performed by STABL program.
Finally, the characteristics of debris flows in three regions of Taiwan,
the north, the central, and the east, are examined based on the information of
debris-flow cases in these regions. A software of geographic information
system (GIS) ArcView8.X, is used to establish the database of influencing
factors such as topographic factors, etc. Then, using a statistical software SPSS
and making multivariable analysis on the happened and not happened cases, the
difference in conditions for debris flows to occur is distinguished. Accordingly,
suggestions based on the results of this study for various regions of Taiwan are
also proposed.
Publisher
臺北市：國立臺灣大學土木工程學系暨研究所
Type
report
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