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1. enlarged base (underream), also known as bell, which increases the base bearing capacity and load carrying capacity.

2. DECREASES THE VERTICAL SETTLEMENT AND DIFFERENTIAL SETTLEMENT.

3. IT ACT AS FOUNDATION FOR UNSTABLE AND COHESIVE EXPANSIVE SOIL SUCH AS BLACK COTTON SOIL.

4. The cost advantages of under-reamed piles are due to the reduced pile shaft diameter, resulting in less concrete needed to replace the excavated material.

5. Provision of under reamed bulbs has the advantage of increasing the bearing and uplift capacities.

6. It also provides better anchorage at greater depths

7. These piles are efficiently used in machine foundations, over bridges, electrical transmission tower foundation sand water tanks

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