Where is thick lift compaction not allowed?

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Multiple Choice

Where is thick lift compaction not allowed?

Explanation:
Thick lift compaction is meant to speed up filling by compacting larger layers, but it’s restricted in the Soil Envelope because this zone surrounds critical subgrade features where precise, controlled compaction is essential. Using large lifts here concentrates the compaction energy near the interface, which can cause nonuniform density, moisture pockets, and potential damage or differential settlement at the edge of the envelope. Keeping lifts thinner in this zone helps ensure a stable, uniform bond with the existing subgrade and protects nearby structures or features. In other zones, the risks are lower or the system can tolerate more aggressive compaction, so thicker lifts may be permitted.

Thick lift compaction is meant to speed up filling by compacting larger layers, but it’s restricted in the Soil Envelope because this zone surrounds critical subgrade features where precise, controlled compaction is essential. Using large lifts here concentrates the compaction energy near the interface, which can cause nonuniform density, moisture pockets, and potential damage or differential settlement at the edge of the envelope. Keeping lifts thinner in this zone helps ensure a stable, uniform bond with the existing subgrade and protects nearby structures or features. In other zones, the risks are lower or the system can tolerate more aggressive compaction, so thicker lifts may be permitted.

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