Calculating long-term settlement in soft clays – with special focus on the Gothenburg

TAFATNEB · 09-05-2013, 07:42 AM

Calculating long-term settlement in soft clays – with special focus on the Gothenburg region

Long-term settlement in clay constitutes an engineering challenge in road design
and construction in areas with deep deposits of soft clay. Soil improvement and
construction of building foundations or embankments can be quite complicated
and expensive in such areas. Construction costs need to be balanced against high
maintenance costs. In order to do this optimally, there is a need to predict longterm
settlement with a high degree of accuracy.
Two different test sites were chosen for back-calculation, a test embankment at
Nödinge and a groundwater lowering at Kaserntorget. There was also one
hypothetical test site.
In this thesis a short description is presented of the fundamental behaviour of soft
clays with regard to compressibility as well as a short explanation of the theory
for the three different models that has been used within this thesis – Embankco,
GS Settlement and the Soft Soil Creep model.
Soil parameter determination for long-term settlement analysis is discussed
together with some of the inherent complications. For the IL oedometer test the
study shows that if the time for the load stage of interest is not sufficiently long
the evaluated creep parameter could be misleading. Back-calculation of CRS
oedometer test, using the Soft Soil Creep model, is performed for this model and
a procedure is suggested.
The outcome of the analysis shows that all three models produce similar results
for the hypothetical case. For the two test sites in question, both GS Settlement
and the Soft Soil Creep model were capable of predicting the measured
settlement with acceptable accuracy. The Embankco program was only used for
the hypothetical case.

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