Abstract
The aim of the present numerical study was to analyse the pressure settlement behaviour and bearing capacity of asymmetric plus shaped footing resting on loose sand overlying dense sand at varying embedment depth. The numerical investigation was carried out using ABAQUS software. The effect of depth of embedment, friction angle of upper loose and lower dense sand layer and thickness of upper loose sand on the bearing capacity of the asymmetric plus shaped footing was studied in this investigation. Further, the comparison of the results of the bearing capacity was made between the asymmetric and symmetric plus shaped footing. The results reveal that with increase in depth of embedment, the dimensionless bearing capacity of the footings increased. The highest increase in the dimensionless bearing capacity was observed at embedment ratio of 1.5. The increase in the bearing capacity was 12.62 and 11.40 times with respect to the surface footings F1 and F2 corresponding to a thickness ratio of 1.5. The lowest increase in the dimensionless bearing capacity was observed at embedment ratio of 0.1 and the corresponding increase in the bearing capacity was 1.05 and 1.02 times with respect to the surface footing for footings F1 and F2 at a thickness ratio of 1.5.
Highlights
The demand for multi-story buildings with an asymmetric plan has increased as a result of a shortage of construction land in metropolitan areas
It has been found from the literature [9], that the ultimate bearing capacity increased with the increase in the depth to width ratio of the strip footing
The effect of embedment depth on the bearing capacity of the strip footing was investigated in the literature, and it was reported that bearing capacity factors were dependent on internal angle of friction and embedment depth
Summary
The demand for multi-story buildings with an asymmetric plan has increased as a result of a shortage of construction land in metropolitan areas. According to a study on strip and circular footings resting on loose sand overlying dense sand [9,13], the bearing capacity factors for the footing on layered sand was dependent on the relative strength of both the layer and the thickness of the upper layer below the base of the footing [9] and the influence of upper layer thickness depends mainly on shear strength parameters and ratio of bearing capacity of the layers [13] It is evident from the above studies that no study was conducted so far for the asymmetric plus plan shaped footing resting on loose sand overlying dense sand. The parameters varied were angle of friction of both layers, thickness of upper loose sand layer and depth of embedment
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