Analysis of bearing capacity of layered soil
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Date
2022-10
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
Load bearing capacity of the foundation is the major concern in the field of geotechnical engineering. Ultimate bearing capacity can be defined as the least pressure at which soil undergoes shear failure. The ultimate bearing capacity of a foundation on layered soil is very important as it is a prerequisite to any design. The parameters upon which safe bearing capacity of soil depends are shape of the foundation, soil layering, depth of foundation, etc. The parameters selected for the present study were thickness of top layer of soil and width of the footing. For the present study, soil sample has been extracted from the site at Fazalpur in Rudrapur. Initially a numerical model was undertaken using finite element method (FEM), PLAXIS 3D. Three dimensional models in this study were represented using finite element analysis which in turn is based on Mohr coulomb failure criteria. The method used to analyse two layered soil systems was Meyerhof and Hanna method. The outcomes from PLAXIS 3D software and the classical approach (Meyerhof and Hanna) were compared. During the study it was observed that the bearing capacity of soil is directly proportional to the thickness of the top layer of the soil and inversely proportional to the length to width ratio of footing. The percentage variation between the results were from 2.32% to 14.89%. The variation was expected due to the detailed analysis of the soil layers in PLAXIS 3D while the manual method was based on Meyerhof and Hanna method.