Abstract
In the present paper, the interference effects on bearing capacity of two and three closely spaced strip footings resting on granular bed overlying clay are being studied. A simple analytical model is proposed to predict the load-carrying capacity and the interference factor of an interfered footing, when adjacent strip footings are optimally placed on the surface of a Granular Bed (GB) overlying clay and both the footings are simultaneously loaded. A punching shear failure mechanism is envisaged in the analytical model. The load-carrying capacity of the footing is taken as the sum of total shearing resistances along the two vertical planes through the edges of the strip footing in the upper granular layer and the load-carrying capacity of the soft clay beneath the GB. Insights gained from finite element simulations are used to develop the new modified punching shear model for interfering footing. Bearing capacity can be easily calculated by using the proposed punching shear model for interfering footing. The analytical model is validated with numerical analyses and previous experimental results and found to be in reasonably good agreement. The influence of different parameters such as granular bed thickness, width of footing, number of footings are carried out in this study. Doi: 10.28991/cej-2021-03091723 Full Text: PDF
Highlights
Spaced adjacent footings undergo the phenomenon of interference
A punching shear model was proposed by Meyerhof [4] for estimating the ultimate bearing capacity of footings on sand layers overlying clay
A single strip footing is placed on a granular bed overlying weak soil
Summary
Spaced adjacent footings undergo the phenomenon of interference. Interference alters the bearing capacity, settlement, rotational, and failure mechanism of footings. Several researchers have estimated the bearing capacity of a strong layer overlying a weak layer by different methods One such method is assuming that the upper layer spreads the footing load over a wider region on the lower layer surface, thereby minimizing the stress on the lower layer [3]. The load-carrying capacity (qu) of a surface footing is determined by Terzaghi and Peck’s [3] projected area model which is expressed as shown in Equation 1. A punching shear model was proposed by Meyerhof [4] for estimating the ultimate bearing capacity of footings on sand layers overlying clay. For surface strip footings on layered soil, Meyerhof and Hanna's [5] ultimate bearing capacity of dense sand on soft clay is expressed as shown below in Equation 2
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