Which soil condition is most likely to make a contiguous pile wall the most appropriate basement wall type?

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The question asks: Which soil condition is most likely to make a contiguous pile wall the most appropriate basement wall type?

Option provided: 'Loose unconsolidated sandy soil with no water table present.'

Analysis of the option:
- Loose unconsolidated sandy soil tends to offer low shear strength and poor lateral stability, which increases the risk of ground movement and pressure on a basement wall.
- A contiguous pile wall provides a continuous vertical barrier with closely spaced piles that resist lateral earth pressures and water pressures more effectively than standard poured concrete or other types of walls, making it a good fit when the soil lacks strength.
- The absence of a water table (no groundwater) is advantageous for a pile-wall system because groundwater pressure is not contributing to lateral loading or buoyancy forces that could complicate installation and long-term performance. 
- In contrast, the combination of loose soil and groundwater would place substantial demands on a wall system, but the stated condition (no water table) minimizes water-related loading, reinforcing the suitability of piles.
- Therefore, this soil condition aligns with the typical application of contiguous pile walls, which are chosen to manage high lateral loads in weak soils when groundwater is not a dominant factor.

Rationale for why this option stands out:
- It specifies both a weak soil (loose, unconsolidated sand) and a favorable groundwater condition (no water table), which together create a scenario where a continuous-pile barrier is the most practical and economical solution.
- Other options (not provided here) would need to be evaluated against how they change the loading, installability, and long-term performance; with the given condition, a contiguous pile wall is particularly advantageous for resisting lateral pressures in weak soils without groundwater effects.

In summary, the described soil condition directly supports the selection of a contiguous pile wall due to weak soil bearing capacity and the absence of groundwater pressures, which collectively favor a continuous-pile solution over alternative wall types.

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Which soil condition is most likely to make a contiguous pile wall the most appropriate basement wall type?

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