Civil Engineering Professional Engineer Practice Exam 2026 – All-in-One Comprehensive Guide to Exam Success!

Question: 1 / 400

What type of foundation is commonly needed for unstable soil conditions?

Shallow foundations

Strip foundations

Deep foundations

Deep foundations are commonly used in unstable soil conditions because they extend deeper into the ground to reach more stable soil or bedrock. Unstable soil can include loose, compressible, or poorly graded soils that may not provide adequate support for structures.

Deep foundations, such as piles or drilled shafts, transfer the load from the structure to deeper, more competent soil layers. This helps to reduce the effects of settlement and ensures the stability of the structure over time.

In situations where shallow foundations are used on unstable soils, there is a higher risk of settlement and other issues, which is why engineers typically opt for deep foundations in these scenarios. Deep foundations thus serve as a critical solution for maintaining safety and stability in construction on challenging ground conditions.

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Concrete slab foundations

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