Consolidation: Secondary (Long-Term) Consolidation Flashcards
(4 cards)
1
Q
What is secondary settlement (Buisman effect)?
A
Ongoing soil compression after primary consolidation, caused by creep, organic decomposition, and clay-water interaction.
2
Q
What is the Buisman equation for secondary settlement?
A
Ss=CsHlogt
Where:
Ss= Secondary settlement (m)
Cs= Secondary compression coefficient
H= Soil layer thickness (m)
t= Time elapsed
3
Q
In which soils is secondary settlement most significant?
A
Peat and clay due to high water content and slow water escape.
4
Q
What happens if secondary settlement is ignored in construction?
A
Roads, buildings, and dikes may continue to sink over decades, requiring continuous maintenance.
