COMPARATIVE STUDY ON LATERAL CAPACITY OF UNDERREAMED MONOPILE IN COHESIONLESS SOIL

Abstract

The loads of the structures are transferred to the soil by foundation. Foundations of structures are subjected to different modes of loading. For weak soil and heavy construction of structures pile foundation are better choices. Pile foundations are usually used in harbor structures, bridges, high rise structures and chimneys where both axial and lateral loads are expected to act on the foundation. For the improvement of lateral capacity, many researchers have developed different techniques. The new improvement techniques have been found costly. Under-reamed piles have mechanically formed enlarged base that forms an inverted cone and can only be formed in stable soils. They are used in normal ground condition also where economics are favorable. Under reamed 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. In many situations, these piles are also required to resist considerable amount of lateral loads besides vertical compressive and uplift loads. However, the behaviour of these piles under lateral loads has not been properly investigated Used to increase the load-carrying capacity of pile foundation under compression, tension, and lateral loading with least deflection compared to other piles. This thesis work is to study the behavior of under-reamed piles under cyclic loading. The numerical analysis is done by PLAXIS-3D software. The analysis is done on under-r-eamed piles in sand. The study focuses on the lateral capacity of under-reamed pile under the influence of differentsize and geometry of under-ream. The study is done under lateral loading condition on under-reamed piles in sand.