'is study aims to investigate the effect of sand compaction piles on the swelling and shrinkage behavior of expansive clay soil. A

series of experimental laboratory tests were carried out using the modified Proctor mold and a circular footing. 'ediameter of the

sand compaction pile was selected to give a replacement area ratio equal to 57%. To model the swelling and shrinkage cycles, water

was added to the sample and the heave was recorded at regular time intervals. 'e shrinkage was obtained by heating the outer

surface of the modified Proctor mold at a temperature of 110°C± 5°C by a development heating system designed for this purpose

to accelerate the shrinkage process. 'e vertical movement was recorded at regular time intervals. 'e swelling and shrinkage

cycles were carried out under an externally applied pressure equal to 120 kPa. 'e main results of this study showed that, for

untreated expansive soil, the swelling potential reaches the highest value at the second cycle and started to decrease for the

subsequent cycles. After the fourth cycle, the swelling potential decreases and reaches about half the value of the initial swelling

potential and the equilibrium state occurs. For expansive soil treated with a sand compaction pile, it is found that there is a

significant reduction in both swelling and shrinkage potential. Moreover, it is observed that after the first cycle both the swelling

and shrinkage potential decrease significantly and both reach a negligible value after the second cycle.