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This
tool is designed to analyze the potential of liquefaction based on
CPT data. The procedure of liquefaction assessment in
NovoCPT, is based on
recommendations proposed in "Guide to Cone Penetration
Testing" (Robertson 2009).
Tabular data is presented at each depth and all the dataset is
plotted versus depth on different charts. Columns of analysis
results table are described below:
Sv : Total overburden stress
(sv)
S'v : Effective overburden stress
(s'v)
Rd
: Stress reduction factor in simplified Seed and Idriss
1971 formula
Dr : Relative density of soil (based
on Tatsuoka et al. 1990)
gmax : Maximum shear strain, estimated
from Dr and liquefaction safety factor, at each depth
ev : Volumetric strain (for
settlement analysis), estimated from Dr and gmax, at each depth (read this
article)
Kc :
Fines
content correction factor (Robertson & Wride 1998) for
Qtn
CSR :
Cyclic
stress ratio, please read this article for more information
CRR :
Cyclic
resistance ratio (based on Robertson 2009 method), please
read
more
Safety Factor
: Liquefaction safety factor = CRR / CSR * MSF
MSF :
Magnitude scaling factor
Lateral
Displacement : Accumulation of the Post-liquefaction lateral
displacement of the site, estimated based on Zhang, Robertson
and Brachman (2004) method (from the bottom of the model (the
lowest depth in CPT dataset) up to that specific point). Please
read this
article for more information.
Sr
: Residual shear strength
Liquefaction
Behavior : Behavior of soil according to Robertson 2009
definition
To export, print and save the results use the
toolbar buttons (more information here). By default, safety factor against
liquefaction is assumed as unity and the region for safety factors
less and greater than this value are colored by dark red and dark
green on the safety factor chart. To change the required safety
factor, use the textbox at the bottom of the page and then press
 Update button to redraw the chart.
 Please
notice that liquefaction is only assessed for those soil types
which are set in NovoCPT preferences page
to be potentially liquefiable.
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