Rajyalakshmi, K. and M R, Madhav
(2022)
Bearing Capacity of Thin Ring Footing on Reinforced Foundation Bed Over Soft Ground.
In: Indian Geotechnical Conference, IGC 2020, 17 December 2020 through 19 December 2020, Virtual, Online.
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Abstract
A reinforced foundation bed (RFB), a composite of granular material and geosynthetic reinforcement, enhances the bearing capacity of shallow foundation in soft ground due to the shear resistance mobilized along the granular fill–geosynthetic interface. This paper presents a simple approach to estimate the ultimate bearing capacity of a ring footing on RFB over soft ground, based on Meyerhof’s analysis of ultimate bearing capacity of footings on two-layered soils. The values provided by Keshavarz and Kumar [2] for the bearing capacity factor Nc for rough ring footings on a c-ɸ soil are incorporated in the formulation. The proposed model considers the effect of axial resistance mobilized by a single circular sheet of geosynthetic reinforcement due to interfacial shear stresses developed over its top and bottom surfaces together with shear resistances of the granular fill along the outer and inner edges of the ring and that of the soft ground to arrive at the total ultimate bearing capacity of the reinforced two-layer system. A parametric study quantifies the effects of various parameters (considering the shear resistance on the outer face of the footing alone and the resistance on the inner face together with that on the outer face) on the degree of bearing capacity improvement. Predictions compare well with experimental results of Shalaby [8] for relatively smaller thickness of granular layer. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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