Model Test for Slope Stabilized by Anchored Geotextile/Geonet System
Date Issued
2010
Date
2010
Author(s)
Fong, Kao-Yuan
Abstract
Anchored geotextile/geonet system (AGS) is a method for protecting slopes. A geotextile or geonet is covered over the surface of a slope, driven by ground anchors through its reinforced openings into the underlying soil mass, and fixed on the slope. The fabric can provide confining strength to prevent failure on the slope surface, and the anchors can maintain stability of the slope. There are many successful application cases abroad. However, there are no research nor application for in-situ slope of this slope protection method in Taiwan. From economical and ecological view points, the use of AGS as a protection method for slopes not only decreases the expenses and duration of construction, but also improves the environment.
Model tests are used to understand the reinforced slope failure behavior and the mechanism of failure of this system. This research is to establish a series of model tests on slopes formed by sandy soil. The change of slope angle, anchorage force, anchor type, and seepage condition were probed in this study. The particle image velocimetry (PIV) measurement technique was used to investigate the soil movement during failure process, and limit equilibrium method was used to derive the factor of safety of failure plane.
The results of steel wire anchored slope tests show that dry slope tests have a failure shape similar to a wedge, and wet slope tests have a circular failure surface. The results of soil nail anchored slope tests show that the failure zone is equal to the reinforced soil which moves horizontally forward. The geotextile can prevent soil loss during the whole test. Even if single row of anchorage force is lost, the other row of anchorage force can still help prevent further failure.
Subjects
slope
reinforced slope
anchored geotextile/geonet system
model test
Type
thesis
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