Geoscience Reference
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Figure 23.1 Foundation movements.
Consolidation settlement (
c )
= µρ oed .
ρ
µ =
settlement coefficient based on Skempton's pore pressure coefficient and the
loading geometry.
The table shows a simplified version of this consideration.
Table 23.4 Correction factors based on Skempton and Bjerrum (Tomlinson, 1995).
Type of clay
Description
Correction factor
Very sensitive
Soft alluvial, estuarine and marine
1.0-1.2
Normally consolidated
0.7-1.0
Overconsolidated
London Clay, Weald, Oxford and Lias
0.5-0.7
Heavily overconsolidated
Glacial Till, Keuper Marl
0.2-0.5
23.5 Typical self weight settlements
The self weight settlements occur for all placed fills - even if well compacted.
The self weight settlement of general fills is assumed to occur over 10 years,
although refuse fills take over 30 years to stabilise.
Depth of fill - H.
 
 
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