Abstract:
This study was undertaken to assess the interaction behaviour of soil jute
geotextile. The thesis presents the results of an investigation into soil - jute
geotextile interaction by means of pullout tests. For this purpose a large size pullout
box was designed and constructed. Pullout test results can be severely affected by
boundary conditions, in particular by the lateral earth pressure developed on the
front wall of the box, short lengths of jute geotexti Ie, depth to length of
reinforcement ratio, relation between soil particle size and container volume, side
friction developed on the wall and soil dilatancy. In order to avoid this effect,
sleeves at the front wall and fiber glass sheets were used in the front and side walls
of the pullout box. Two types of untreated jute geotextiles samples were obtained
from BJMC and BJRI. Mechanical and Hydraulic properties of these jute geotextiles
were determined following the ASTM standard test methods. Dredged fill sand
samples used for the pullout test were collected from the stack yard of Kaliakoir By
Pass Construction Project, Joydevpur-Tangail Road, Gazipur, Bangladesh. The
Index and shear strength properties of sand samples were determined following
ASTM standard test methods.
Soil reinforcement interaction is a primary issue for designing'of any reinforced soil
structures. The soil to jute geotextile interaction parameters are influenced by
interaction mechanism between sand samples and jute geotextiles, physical and
mechanical properties of sand samples (density. grain size distribution, shear
strength of sand samples) and mechanical properties (tensile peak strength), shape
and geometry of jute geotextiles. The soil to jute geotextiles interface friction
parameters (interface friction angle "8" and coefficient of interaction "C;"") for
different surcharge pressures were investigated. For this purpose, a number of
pullout tests were carried out to evaluate the intcrface friction parameters of two
types of jute geotextiles (Wool Pack and DW Jute Bag) and sand samples. The
results of this study indicate that the dredged fill sand soils can be successfully
reinforced with jute geotextile rcinforcements and the coefficients of interaction (0)
are equal to 0.9 - 0.95 for all tests indicating good bonding between the tested soil
and jute geotextiles. Additionally an assessment of technical and economical feasibility of jute geotextile
reinforced steep sloped embankment is also presented in this study. It has been
highlighted that despite the extra cost involvement for jute geotextiles used as
reinforcements, the net benefit that can be accrued from the other components, e.g.
cost of sand, cost of clay, cost of saved lands, revenue earned from the saved lands
etc., can be very significant for different heights of embankments .
