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Numerical Study of the Behaviour of a Circular Footing on a Layered Granular Soil Under Vertical and Inclined Loading

Singh Surja Pratap, Roy Amrit Kumar

Civil and Environmental Engineering Reports

2021

Vol. 31, no. 1

29--43

This paper aims to study the behaviour of a circular footing resting on two granular layers, i.e., a dense sand layer resting on loose sand strata, subjected to a vertical and an inclined loading (α=0°, 10°, 20°, 30°) using the finite element (FE) software PLAXIS-3D. The Mohr-Coulomb criterion is employed for the analysis of the model, in which two parameters are considered to vary significantly; (1) thickness of the top layer (dense layer) and (2) friction angle (ф) of both the layers. In the circular footing, the bearing capacity on the layered soil profile is assessed using the mechanism of punching shear failure following the desired area approach. The punching shear failure mechanism formed in dense sand has a parabolic shape at the ultimate load when the maximum mobilization of shear force through the failure surface is taken into account, otherwise, the punching failure is the actual failure while punching in the lower layer continues to a greater extent, depending on the interface load. Bearing pressure decreases as the inclination increases with respect to the vertical, along with bearing pressure increasing as the thickness of the dense sand layer increases. The software results compare well with data available from the literature.

The bearing capacity of layered subsoil

Szypcio Z., Dołżyk K.

Studia Geotechnica et Mechanica

2006

Vol. 28, nr 1

45-60

Various methods for calculation of the bearing capacity of a layered subsoil are analyzed. The values obtained are compared with the values calculated by means of PLAXIS Version 8, the latter being considered the correct ones. It is shown that Polish Standards and proposition modified by the authors are admissible to use only in the case of subsoil with a weak cohesionless lower layer, with small angle of friction. In engineering calculations, the bearing capacity of layered subsoil can be obtained based on a classic Terzaghi formula and average parameters of homogeneous subsoil.

Analizowano różne metody obliczania nośności granicznej podłoża warstwowego. Otrzymane wyniki porównywano z wynikami otrzymanymi przy użyciu programu PLAXIS Version 8. Wykazano, że stosowanie Polskiej Normy i uproszczonej autorskiej modyfikacji jest dopuszczalne jedynie w przypadku, gdy dolną warstwę podłoża stanowi słaby grunt niespoisty o małej wartości kąta tarcia wewnętrznego. W obliczeniach inżynierskich dopuszcza się obliczanie nośności granicznej podłoża warstwowego z wykorzystaniem klasycznej formuły Terzaghiego i uśrednionych wartości parametrów geotechnicznych.