Abstract:
This study described a bearing capacity of loose sand with composite geotextile:Polyfelt
PEC75 , PEC100 , PEC200 used for reinforcement of unpaved roads. The tension-strain
behaviour of composite geotextile under axisymmetric loading condition same as the mechanism
of this study and effects of the different case between unsoaked and soaked, namely: Modified
CBR test. A method of test performed in laboratory. Firstly tested on loose sand overlain by
compacted sand. Secondly tested on loose sand overlain by compacted sand with reinforced
composite geotextile with fixed-end. Lastly tested on loose sand overlain by compacted with
reinforced composite geotextile with free-end. A modified CBR test was carried out which
considered the reinforcing mechanism. Finite element method was utilized to back-analyze the
result of the modified CBR test. And results of the finite element analyses fit with the
experimental data.
It can be concluded that there is not significant difference between unsoaked and soaked,
also at different loading condition at speed 1 mm/min and 5 mm/min. When a different grade of
composite geotextile provided various bearing capacity of soil-geotextile system. This study has
confirmed the findings of number of previous investigations by showing that the bearing capacity
of a sand layer over a loose sand subgrade is increased about 40, 60 and 120 % by the
incorporation of a layer of geotextile Polyfelt PEC75, PEC100 and PEC200 at the sand-loose sand
interface, respectively.