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Ground Stability, Foundations and Substructures 123<br />

(e)<br />

(f)<br />

Photograph 3.7 (Continued)<br />

Bored displacement piles<br />

Continuous helical displacement piles<br />

Continuous helical displacement (CHD) piles are becoming a popular alternative to CFA<br />

piles. The displacement piles have the advantage that they do not produce arisings; this is<br />

particularly useful on contaminated sites. In most ground conditions, the CHD piles have<br />

enhanced load-carrying capacity, compared with a CFA pile of similar dimensions. Due to

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