Geoscience Reference
In-Depth Information
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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