Abstract
The use of geosynthetic reinforcement to enhance the ultimate load-bearing capacity and reduce the anticipated settlement of the shallow foundation has gained sufficient attention in the geotechnical field. The improved performance of the shallow foundation is achieved by providing one or more layers of geosynthetics below the foundation. The full wraparound technique proved to be efficient for the confinement of soil mass and reduction in settlement of foundation however lacks the literature to ascertain the performances of such footing under dynamic loading. In view of the above, the present study examines the effect of geosynthetic layers having a finite length with full wraparound ends as a reinforcement layer, placed horizontally at a suitable depth below the foundation using the finite element modeling (FEM) and evaluates the ultimate load-bearing capacity of a strip footing resting on loose and dense coarse-grained earth beds under seismic loading and further compared to those of footing resting on unreinforced earth bed. Moreover, the effect of horizontal seismic acceleration coefficient (k<sub>h</sub>) on the ultimate load-bearing capacity has been investigated by varying k<sub>h</sub> from 0.1 to 0.6 at an interval of 0.1, for both reinforced and unreinforced earth bed having loose and dense soil strata. Furthermore, this study demonstrates that by adopting the new practice of using the geosynthetic reinforcement with the full wraparound ends in foundations, it is possible to support relatively heavier structures under static as well as dynamic loading without allowing large footing settlements. From the outcomes of the present study, it is noted that the ultimate load-bearing capacity of footing resting on loose and dense sand bed found to be improved by 60% and 18% for soils having friction angle of 25° and 40°, respectively compared to respective unreinforced earth beds under static condition.
Highlights
Soil reinforcement is a method to enhance the stability of the overall structure by adopting the practices of the high tensile member below the foundation in the form of geosynthetics [27, 34]
To validate the numerical model used in the present study, a strip footing resting on the unreinforced earth bed is analyzed using the Mohr-Coulomb model (c-φ soil) and the values of the bearing capacity factor due to the cohesion component of soil (Nc) and bearing capacity factor from the component of unit weight (Nγ) are obtained by lower bound limit analysis using finite element modeling (FEM) and compared with values obtained by various researchers and discussed below
A numerical study using finite element method on the behavior of strip footing supported on reinforced earth bed is presented under static and various seismic
Summary
Sagar JAISWAL, Vinay Bhushan CHAUHAN geosynthetic reinforcement with the full wraparound ends in foundations, it is possible to support relatively heavier structures under static as well as dynamic loading without allowing large footing settlements. From the outcomes of the present study, it is noted that the ultimate load-bearing capacity of footing resting on loose and dense sand bed found to be improved by 60% and 18% for soils having friction angle of 25° and 40°, respectively compared to respective unreinforced earth beds under static condition. Keywords: reinforced earth bed, bearing capacity, strip footing, finite element method, pseudo-static analysis
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