Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Experimental Study on Pullout Capacity of Vertical Shallow Multi-Plate Helical Piles in Sand
Swapnali S. Pawar, Post Graduate student, Dinesh Bishnoi, Post Graduate student, Upendra M., Post Graduate student, Venkateswarlu P., Post Graduate student and Jignesh B. Patel
Helical piles are structural elements which are not only capable of resisting compressive and tensile loads but which can also counterbalance the overturning moments. Current uses of helical piles range from shallow to deep foundation types. Present investigation has been carried out on use of helical multi plate piles as shallow foundation piles and their pullout resistance in dense sands. The pile models cylindrical multi plate helical pile (CMHP) and tapered multi plate helical piles (TMHP) were used to investigate the effect of varying plate geometry of TMHP from the CMHP on pullout load for different embedment depths. Both model piles TMHP and CMHP exhibited increased pullout load capacities with increasing embedment depths. It was observed that the TMHP show improvement in pullout capacity as compared to the CMHP only after a certain embedment depth was reached. For embedment ratio more than 2.5, TMHP shows marginal improvement over CMHP while for embedment ratio less than 2.5 CMHP shows better results than TMHP. Experimental results of pullout load capacity are in good agreement with theoretical model results given by Mitsch and Clemence.
|article #3146; publication #1050 (India2018)|