Discussion
Identify the type of pile shown in the figure below. (A pile is inserted into granular soil to increase the bearing capacity of the soil.)

Answer: B
The figure shows a compaction pile: a pile driven into loose granular soil to compact it. The horizontal arrows point outward from the pile along its whole length, showing the soil being pushed sideways and densified, which raises its bearing capacity. An end-bearing pile would show load passing to a firm stratum at the tip, a friction pile would show shear resistance along the shaft carrying the load, and a tension pile (uplift pile) resists upward pull. The arrows here do not show those actions.
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