Negative Skin Friction (NSF) & Downdrag – Easy Notes for Engineers

PIGSO LEARNING LLP
Published: 11 December 2025

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If you work with piles, you know NSF can be confusing.

Weve created simple and corrected NSF + Downdrag notes that explain everything in a clear and practical way.

Whats Inside:
How NSF develops when soil settles more than the pile
Difference between downdrag and structural load
Neutral plane and why it matters
NSF calculation methods (-method, -method)
How bitumen coating helps reduce NSF
Solutions like sleeves, pre-augering, and relief piles
Correct pile design steps considering NSF

Perfect for civil engineers, geotechnical engineers, and PLAXIS learners.
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Categories

Pile Foundations

Keywords

pile inetgrity test, Pile deflections