| Summary: | 碩士 === 淡江大學 === 土木工程學系 === 85 === This paper presents an analytical method to evaluate the
stability of geosynthetic-reinforced embankments. Variational
approach developed by Castillo and Revilla is adopted and
extended.The reinforcing inclusion that resists extension only
is modeled as an anisotropic layer of strengthened soil. Since
transfer mechanism of shear stress between inclusion and the
adjacent soil matrix are adhesive and frictional forces, the
constraint provided by the inclusion propagates from the
interface of these two materials toward a limit distance of
soil. The reinforcing inclusion is then considered as a
strengthened layer with certain thickness.Several conclusions
can be drawn after the preliminary investigation of the
reinforced embankment:The most possible failure surface is
altered by the existence of strengthened anisotropic layer of
soil.From the study of a single reinforcement placed on various
position, a poor reinforcing zone is found in the upper area of
the embankment. Reinforcement embedded in this zone contributes
little in stabilizing the embankment. This area expands from top
of embankment farther into the soil mass for low cohesion soil
and for gentle slope.Increase of reinforcement number or
strength expands the failure surface deeper into the soil,
failure surface also passes farther away of the toe.For the
reinforced embankment with the failure surface passes through
the toe, inclusion placed at the same level as the toe
contributes little stabilizing effect.
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