Model studies of bearing capacity of rectangular foundation subjected to eccentric and inclined loads
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TECHNICAL PAPER
Model studies of bearing capacity of rectangular foundation subjected to eccentric and inclined loads Sujata Gupta1 · Anupam Mital1 Received: 11 May 2020 / Accepted: 23 September 2020 © Springer Nature Switzerland AG 2020
Abstract This study presents the behaviour of eccentrically inclined loaded rectangular foundation on unreinforced and geogrid reinforced sand carried out experimentally, theoretically and numerically. In the past, several works have been done relating to the estimate of the ultimate bearing capacity (UBC) of shallow foundations supported by geogrid reinforced sand. These researches are limited to strip, square and circular footings. It is found that the less attention was given to determine the UBC of the shallow rectangular foundation under eccentric and inclined load with different depth of embedment Df . Hence, the present study is based on the behaviour of eccentrically inclined loaded rectangular (surface and embedded) foundation on the unreinforced and geogrid reinforced sand bed. To determine the load–settlement behaviour and compare it with experimental observation, equally theoretical and numerical analysis (PLAXIS 3D) has also been conducted. Keywords Eccentric loading · Load inclination · Geogrid · Rectangular footing · Ultimate bearing capacity (UBC) · Reduction factor · PLAXIS 3D Abbreviations RF, RKR Reduction Factor for the unreinforced and reinforced case: respectively UBC Ultimate bearing capacity List of symbols B Width of foundation L Length of foundation t Thickness of foundation b Length of the reinforcement layer u Location of the top layer of reinforcement from the bottom the foundation h Vertical distance between two consecutive layers N Number of the reinforcement layer e Load eccentricity α Load inclination with the vertical Df Depth of embedment df Total depth from the bottom of the foundation to depth of reinforcement layer * Sujata Gupta [email protected] Anupam Mital [email protected] 1
ϒ Unit weight of sand Υd Dry unit weight of sand Υd(max) Maximum dry unit weight of sand Υd(min) Minimum dry unit weight of sand qu Ultimate bearing capacity q Surface surcharge Nc , Nq , NΥ Bearing capacity factors Sc , Sq , SΥ Shape factors dc , dq , dΥ Depth factors ic , iq , iΥ Inclination factors s Settlement B′ Effective width of the foundation A′ Effective area of the foundation Cu Coefficient of uniformity Cc Coefficient of curvature c Cohesion G Specific gravity D10 Effective particle size Dr Relative density (ϕ) Angle of internal friction emax Maximum void ratio emin Minimum void ratio fie Combined inclination-eccentricity factor ∝1 , ∝2 , ∝3 , ∝4 Constants
Department of Civil Engineering, National Institute of Technology, Kurukshetra, Haryana 136119, India
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Introduction The bearing capacity of soil plays an important role in the design of the foundation. Bearing capacity is the ability of soil which supports the fo
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