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Interference of Two Closely Spaced Strip Footings Embedded in Cohesionless Fibre-Reinforced Foundation Soil Bed
The present study pertains to the analyses of two closely spaced strip footings embedded at shallow depths and supported on fibre-reinforced cohesionless soil medium using finite element method software ABAQUS. For the analyses, the two footings are considered to be symmetrical and foundation soil reinforced only in vicinity of the footings. Further, a case of footings embedded in unreinforced cohesionless soil medium is taken up for comparison. Mohr-Coulomb plasticity model with non-associated flow rule is used to model the foundation soil medium inputting the equivalent soil properties of the fibre-reinforced soil in reinforced zone. Discretizing the domain with four node continuum plane strain elements (CPE4R), the mesh, domain sizes, and reinforcement zone are optimized. The effect of interference on bearing capacity and settlement aspects measured at permissible conditions have been studied by varying clear spacing between the footings, percentage of fibre reinforcement, and depth of footing embedment. The results are presented in terms of non-dimensional interaction factors defined as the ratio of bearing capacity/settlement of interfering footings resting on reinforced medium to the same measured for that of an isolated footing resting on unreinforced medium. It has been observed that the interference affects predominantly on the behaviour of an isolated footing embedded both in reinforced and unreinforced soil medium. Interaction factor for bearing capacity is found to be greater than one whereas the same for settlement is observed to be less than one, for interfering footing embedded in fibre-reinforced soil. However the same are contrary for interfering footing embedded in unreinforced soil. In the zone of major interference, with increase in percentage of fibre-reinforcement, the bearing pressure is found to enhance and settlement lowers considerably compared to unreinforced case.
Interference of Two Closely Spaced Strip Footings Embedded in Cohesionless Fibre-Reinforced Foundation Soil Bed
The present study pertains to the analyses of two closely spaced strip footings embedded at shallow depths and supported on fibre-reinforced cohesionless soil medium using finite element method software ABAQUS. For the analyses, the two footings are considered to be symmetrical and foundation soil reinforced only in vicinity of the footings. Further, a case of footings embedded in unreinforced cohesionless soil medium is taken up for comparison. Mohr-Coulomb plasticity model with non-associated flow rule is used to model the foundation soil medium inputting the equivalent soil properties of the fibre-reinforced soil in reinforced zone. Discretizing the domain with four node continuum plane strain elements (CPE4R), the mesh, domain sizes, and reinforcement zone are optimized. The effect of interference on bearing capacity and settlement aspects measured at permissible conditions have been studied by varying clear spacing between the footings, percentage of fibre reinforcement, and depth of footing embedment. The results are presented in terms of non-dimensional interaction factors defined as the ratio of bearing capacity/settlement of interfering footings resting on reinforced medium to the same measured for that of an isolated footing resting on unreinforced medium. It has been observed that the interference affects predominantly on the behaviour of an isolated footing embedded both in reinforced and unreinforced soil medium. Interaction factor for bearing capacity is found to be greater than one whereas the same for settlement is observed to be less than one, for interfering footing embedded in fibre-reinforced soil. However the same are contrary for interfering footing embedded in unreinforced soil. In the zone of major interference, with increase in percentage of fibre-reinforcement, the bearing pressure is found to enhance and settlement lowers considerably compared to unreinforced case.
Interference of Two Closely Spaced Strip Footings Embedded in Cohesionless Fibre-Reinforced Foundation Soil Bed
Ekbote, Anupkumar G. (author) / Nainegali, Lohitkumar (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 454-464
2019-03-21
Conference paper
Electronic Resource
English
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