The point of rotation and ultimate lateral resistance of underreamed piles have been computed in terms of passive resistance along the shaft and additional resistance on the surface of bulb(s) as well as bearing on the bottom and uplift resistances on the top of bulb(s). In this paper, an analytical procedure has been suggested to predict the ultimate lateral load capacity of the underreamed piles incorporating the influence of (i) size of bulb, (ii) position of bulbs, (iii) number of bulbs, (iv) length to diameter ratio of piles and (v) type of soil strata. However, the behaviour of these piles under lateral loads has not been properly investigated and the present guidelines for their design under lateral loads are mainly empirical. In many situations, these piles are also required to resist considerable amount of lateral loads besides vertical compressive and uplift loads.
Underreamed piles having one or more bulbs at specified locations along their depths have been extensively used in India to support a wide variety of structures in almost all types of soil strata.
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