Abstract
A 3D finite element (FE) analysis has been carried out to propose a design chart for Sand-Jute geotextiles-Sand (SJS) reinforced low volume road section on soft subgrade foundation. The SJS (Jute geotextile with a thin layer of sand on each side of it) layer has been placed in between the subgrade soil and the top granular layer. In the present FE analysis, nonlinear behaviour of low volume road materials has been considered. The rutting behaviour of a low volume road section with jute geotextiles reinforcement layer has been investigated. Results of the FE analysis reveal that the improvement due to jute geotextiles is more pronounced in road sections with thin top granular layer than in other sections. An attempt has also been made to study the mobilization of tensile strength of jute geotextiles under small and large rut depths. In the case of large rut depth (75 mm), it has been found that a minimum thickness of the top granular layer of 0.2 m is adequate for woven jute geotextiles with stiffness of 20 kN/m. For benefit of the practising engineers dealing with designing jute geotextiles reinforced low volume road section, a design chart has been proposed for 50-mm rut depth.
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