Bearing capacity of ring footings placed on dense sand underlain by a loose sand layer

Khatri, VN and Kumar, J and Das, PP (2020) Bearing capacity of ring footings placed on dense sand underlain by a loose sand layer. In: European Journal of Environmental and Civil Engineering .

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Abstract

The ultimate bearing capacity of a ring footing on loose sand deposit, with an inclusion of a dense sand layer on its top, has been determined numerically in a bound form by following the finite element limit analysis (FELA). The friction angles �1 and �2 were varied from 40° to 46° and 30° to 36° for the top dense sand and the bottom loose sand respectively. The Mohr-Coulomb�s yield criterion has been assumed to be applicable. The bearing capacity has been found to increase quite extensively with an increase in the thickness (Formula presented.) of the dense sand layer thickness up to a certain optimal thickness (Formula presented.) before attaining a constant value. The magnitude of (Formula presented.) has been found to lie generally between 1.5 and 4.7, and the corresponding maximum value of the bearing capacity with an inclusion of the dense sand layer varies in a wide range of 2.32�82.45 times the corresponding value for an unimproved loose sand deposit; the parameters (Formula presented.) and (Formula presented.) refer to the inner and outer radii of the ring, respectively. Similar to a ring footing on homogeneous sand deposit, the bearing capacity for different chosen combinations of internal friction angles of the two sand layers, tends to become maximum generally for a value of (Formula presented.) closer to 0.25. For the validation, the results for a ring footing on two-layered sand deposit were also determined by using the displacements based elastoplastic finite element (EP-FE) method. The results from the FELA were found to compare well with (i) the obtained solutions based on the EP-FE method, and (ii) the published results by using experiments and the method of stress characteristics. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

Item Type:	Journal Article
Publication:	European Journal of Environmental and Civil Engineering
Publisher:	Taylor and Francis Ltd.
Additional Information:	The copyright of this article belongs to Taylor and Francis Ltd.
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	02 Sep 2020 10:16
Last Modified:	02 Sep 2020 10:16
URI:	http://eprints.iisc.ac.in/id/eprint/66448

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