Methods to Increase Load Carrying Capacity of...

Methods to Increase Load Carrying Capacity of Piles: A Review

Author Name : K. G. Dighe, Dr. A. I. Dhatrak, Prof. R. D. Deshmukh, Prof. S. W. Thakare, Dr. S. P. Tatewar

ABSTRACT

Black cotton soil is most problematic soil for construction purpose. In some situations, it becomes necessary to do construction on black cotton soil. Generally, pile foundation is used in expansive soils to reduce differential settlement but the cost of pile foundation is more. Pile foundation is most commonly used type of deep foundation. Pile foundation derive its load carrying capacity by means of end resistance and skin friction. If side skin friction or end resistance of pile is increased, then it helps to increase load carrying capacity of pile foundation. This paper summarized methods to increase load carrying capacity of piles. Pressure grouting, pile bottom grouting, use of spray expanded frustum are some of the methods which increases piles load carrying capacity. Also, use of improved soil (soil having high load resistance capacity), cemented soil, use of sand around the periphery of pile increases frictional capacity of pile. Post grouting at pile base improves the soil properties present at pile tip and decreases settlement of pile. Compaction of improved soil around the pile surface also increases pile load capacity considerably.Increase in load carrying capacity of piles helps to reduce the number of piles and length of piles which will reduce overall cost of pile foundation.

Keywords: Expansive soil, Skin friction, pressure grouting, cemented soil.