侯硐地區土石流材料—在不飽和狀態下剪力強度之研究
Date Issued
2004
Date
2004
Author(s)
陳奕豪
DOI
zh-TW
Abstract
Abstract
The theory of unsaturated soil has developed completely in the past twenty years, and it can extensively apply to evaluate the stability of unsaturated slope. Furthermore, the unsaturated soil properties are very much affected by the infiltration of rainwater. The study area in the Houtong area located Rueifang in Taipei County. The contents of this research include two parts: laboratory tests and numerical analyses. The tests conducted include isotropically consolidated undrained triaxial (CIU) test, soil-water characteristic curve test, consolidated drained triaxial (CD) test on unsaturated soil sample, etc. The analyses simulate the process of infiltration utilizing STABL computer programs.
As a result, the effective cohesion (c’) and the effective angle of friction are determined as 0 and 43.2°, respectively, according to the tests of soil samples from Datsu Greek. The intensity of stress of the soil increases slightly under the unsaturation condition. The unsaturated soil parameter (fb) ranges from 1.4° to 3.5° and has the nonlinear relationship with the suction of the substrate because of the few content of the fine sandy. In addition, the ability of water maintain of the soil sample from Datsu Greek is poor. Most water would flow out in the condition of low suction of the substrate. Therefore, the water content in the soil varies slightly at low suction of the substrate.
Moreover, the stabilization of the side slope is analyzed by STABL. The safety coefficient of the side slope is low with the value of Fs =1.28. Furthermore, the effect of the rainfall is significant to the safety factor of the side slope. The safety factor of the side slope is close to one while the penetration of the rainfall reaches 11.5 m. The slip level is mainly focus to the top of the side slope, which is consistent to the real situation of destruction in situ.
Subjects
邊坡穩定
降雨入滲
土石流材料
不飽和土壤
stability of slope
initiation zone of debris-flow
infiltration
properties of unsaturated soil
Type
thesis
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