Liquefaction modelling of a strong motion station in Christchurch, New Zealand
File(s)
Accepted version
Author(s)
Tsaparli, V
Kontoe, S
Taborda, D
Potts, D
Type
Conference Paper
Abstract
Advanced constitutive models can replicate several aspects of soil behaviour, but, due to their complexity and number of
parameters, they need more sophisticated and realistic validation under general loading conditions. When modelling
liquefaction phenome
na, the lack of field monitoring data means that
model
testing, such as centrifuge experiments, is
often used as benchmark for the numerical analyses. The 2010
-
2011 Canterbury earthquake sequence in New Zealand
was recorded by a number of strong motion sta
tions at various distances from the earthquake epicentre. Additionally, an
extensive field and laboratory program
me
has
since
become available, adequately describing the geological, geotechnical
and hydro
geo
logical conditions in the area. As such,
the perf
ormance of a two
-
surface bounding surface plasticity
constitutive model for sands, calibrated based on site
-
specific laboratory data, is
assessed using
field evidence
of
a strong
motion station
in fully
-
coupled effective stress
-
based finite element analyse
s. As the real stratigraphy is
complex
, with
layers of silts and clays between the sandy strata, a simpler cyclic non
-
linear
elastic
model
,
which can adequately
incorporate the basic aspects of dynamic soil behaviour, is also used to model the non
-
liquefia
ble strata.
To specify the
input ground motion at the base of the deposit
, the recorded
ground
surface motion
at
a site
with no evidence of liquefaction
is
deconvolve
d and compared with the outcrop predictions of
a New Zealand
-
specific
gr
ound motion predic
tion equation
.
The numerical results are compared with the recorded
horizontal ground
surface acceleration time
-
history of the 22
nd
February 2011 seismic event
, exhibiting very good agreement
.
parameters, they need more sophisticated and realistic validation under general loading conditions. When modelling
liquefaction phenome
na, the lack of field monitoring data means that
model
testing, such as centrifuge experiments, is
often used as benchmark for the numerical analyses. The 2010
-
2011 Canterbury earthquake sequence in New Zealand
was recorded by a number of strong motion sta
tions at various distances from the earthquake epicentre. Additionally, an
extensive field and laboratory program
me
has
since
become available, adequately describing the geological, geotechnical
and hydro
geo
logical conditions in the area. As such,
the perf
ormance of a two
-
surface bounding surface plasticity
constitutive model for sands, calibrated based on site
-
specific laboratory data, is
assessed using
field evidence
of
a strong
motion station
in fully
-
coupled effective stress
-
based finite element analyse
s. As the real stratigraphy is
complex
, with
layers of silts and clays between the sandy strata, a simpler cyclic non
-
linear
elastic
model
,
which can adequately
incorporate the basic aspects of dynamic soil behaviour, is also used to model the non
-
liquefia
ble strata.
To specify the
input ground motion at the base of the deposit
, the recorded
ground
surface motion
at
a site
with no evidence of liquefaction
is
deconvolve
d and compared with the outcrop predictions of
a New Zealand
-
specific
gr
ound motion predic
tion equation
.
The numerical results are compared with the recorded
horizontal ground
surface acceleration time
-
history of the 22
nd
February 2011 seismic event
, exhibiting very good agreement
.
Date Issued
2017-07-16
Date Acceptance
2017-04-26
Citation
2017
Publisher
International Society of Soil Mechanics and Geotechnical Engineering
Copyright Statement
© 2017 The Authors
Sponsor
Geotechnical Consulting Group
Grant Number
GCG Chair
Source
3rd International Conference on Performance-based Design in Earthquake Geotechnical Engineering (PBD-III)
Publication Status
Accepted
Start Date
2017-07-16
Finish Date
2017-07-19
Coverage Spatial
Vancouver, Canada