Abstract
In this study, three dimensional (3-D) finite element analysis are performed to evaluate the effect of geo-textile interlayer on the performance of flexible pavement. The main objective of this study is to evaluate the improvement in stress distribution of flexible pavement due to the application of geo-jute at three specific positions i.e., subgrade-base interface, base-asphalt layer interface, and within asphalt layers. Stress, strain and displacement values are investigated and compared for the application of geo-jute interlayer on various positions. Moreover, to better understand the mechanistic behavior of geo-jute on pavement subgrade, a separate 3-D finite element model is developed to simulate the California bearing ratio (CBR) test on geo-jute reinforced soil. Results showed that the inclusion of geo-jute on flexible pavement significantly improves the pavement performance by producing lower stress, strain, and displacement at top of the subgrade. Moreover, the bearing capacity of subgrade soil increased more than 20% due to the inclusion of geo-jute.
Highlights
The flexible pavement under wheel loads is considered as a homogeneous and elastic half-space in Boussinesq’s theory, which can be used to determine the stresses, strains, and deflections in the subgrade if the modulus ratio between the pavement and the subgrade is close to unity [1]
Al-Qadi et al performed a laboratory study to validate the performance of geogrids and geotextiles and observed that geosynthetics can substantially improve the performance of pavement [11]
Considering the above literature review, this study focuses on the determination of stresses, strains and deflections of various layers of a flexible pavement under an instantaneous rectangular loading by 3-D finite element modeling due to geo-jute application
Summary
The flexible pavement under wheel loads is considered as a homogeneous and elastic half-space in Boussinesq’s theory, which can be used to determine the stresses, strains, and deflections in the subgrade if the modulus ratio between the pavement and the subgrade is close to unity [1]. Pavements are layered systems with better materials on top, and it cannot be assumed as a homogeneous mass. To overcome this limitation, Burmister developed two- and three-layer system, where tangential and radial stresses are considered as identical on the axis of symmetry [3, 4]. In 1968, Duncan et al first introduced the finite element method for pavement analysis [5]
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