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<p><font size="-1">Dear Geoqus member,</font><o:p></o:p> </p>
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<p class="MsoNormal" style="text-align:justify">I’ve been
encountering some issues when modelling contact in a coupled
pore pressure displacement analysis in Abaqus 2016.<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">I’m modelling
transient pore pressure depletion in a rectangular 2D inclusion.
Pore pressure remains hydrostatic throughout the analysis in the
over- under- and sideburden. The model is completely discretized
by CPE4P elements.<o:p></o:p></p>
<p class="MsoListParagraphCxSpFirst"
style="text-align:justify;text-indent:-18.0pt; mso-list:l0
level1 lfo2"><!--[if !supportLists]--><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;
mso-bidi-font-family:Calibri"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]-->material
is linear (poro-)elastic<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-align:justify;text-indent:-18.0pt; mso-list:l0
level1 lfo2"><!--[if !supportLists]--><span
style="mso-ascii-font-family:
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mso-bidi-font-family:Calibri"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]-->loading
is gravitational<o:p></o:p></p>
<p class="MsoListParagraphCxSpLast"
style="text-align:justify;text-indent:-18.0pt; mso-list:l0
level1 lfo2"><!--[if !supportLists]--><span
style="mso-ascii-font-family:
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;
mso-bidi-font-family:Calibri"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]-->model
boundaries are constrained in their normal direction<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">In theory pore
pressure depletion leads to an increase of effective stresses
and a contraction of the inclusion. <o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">I compare two
cases: <o:p></o:p></p>
<p class="MsoListParagraphCxSpFirst"
style="text-align:justify;text-indent:-18.0pt; mso-list:l1
level1 lfo1"><!--[if !supportLists]--><span
style="mso-bidi-font-family:
Calibri;mso-bidi-theme-font:minor-latin"><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman""> </span></span></span><!--[endif]-->The
inclusion is bounded by an impermeable tie constraint <span
style="mso-spacerun:yes"> </span>(Figure 1)<o:p></o:p></p>
<p class="MsoListParagraphCxSpLast"
style="text-align:justify;text-indent:-18.0pt; mso-list:l1
level1 lfo1"><!--[if !supportLists]--><span
style="mso-bidi-font-family:
Calibri;mso-bidi-theme-font:minor-latin"><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman""> </span></span></span><!--[endif]-->The
inclusion is bounded by contact on its lateral boundary,
extending into the over- and underburden (Figure 2). The contact
should act as a flow barrier, hence a very low *<i
style="mso-bidi-font-style:normal">Contact Permeability </i>is
implemented.<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">For the first
model version (no contact) stress and displacement changes are
qualitatively as expected from analytical solutions.</p>
<p class="MsoNormal" style="text-align:justify"><img alt="asdfsad"
src="cid:part1.ED95565C.1CCA38B9@geo.tu-darmstadt.de"
height="191" width="515"></p>
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<![endif]--> </p>
<p class="MsoNormal" style="text-align:justify">Introducing
contact into the model the stress and displacement changes show
roughly the opposite pattern. The inclusion expands and outside
the exclusion horizontal loading occurs which is not at all the
expected and the considered correct result.<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">No slip occurs
during both analysis steps. <span style="mso-spacerun:yes"> </span>The
contact status is closed (CSTATUS=CLOSED) throughout the whole
modelling time. According to Abaqus Documentation 37.4.1, the
normal contact pressure (CPRESS) is calculated from effective
stresses if both sides of the contact have pore pressure degrees
of freedom.<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">I’m using the
following contact definitions:<o:p></o:p></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">*SURFACE INTERACTION, NAME
= Fault1<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">*CONTACT PERMEABILITY<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">1E-50<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">*SURFACE BEHAVIOR,
PENALTY, NO SEPARATION, PRESSURE-OVERCLOSURE = HARD<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">*FRICTION<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">0.7<span
style="mso-spacerun:yes"> </span>,0.0<span
style="mso-spacerun:yes"> </span><span
style="mso-spacerun:yes"> </span>,0.0<span
style="mso-spacerun:yes"> </span>,0.0<span
style="mso-spacerun:yes"> </span><o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">*CONTACT PAIR,
INTERACTION=Fault1, TYPE= SURFACE TO SURFACE<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><b
style="mso-bidi-font-weight:normal">Westfault, Eastfault<o:p></o:p></b></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone encountered similar issues in
poroelastic contact modelling? Has anyone got any idea what
could be wrong with my contact definition, leading to my
unwanted results?<o:p></o:p></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt">I’ve already
been modifying <span style="mso-spacerun:yes"> </span>the
following parameters:<o:p></o:p></p>
<p class="MsoListParagraphCxSpFirst"
style="margin-bottom:0cm;margin-bottom:.0001pt;
mso-add-space:auto;text-indent:-18.0pt;mso-list:l1 level1 lfo2"><!--[if !supportLists]--><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri"><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman""> </span></span></span><!--[endif]-->Pore
pressure boundary conditions <o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="margin-bottom:0cm;margin-bottom:
.0001pt;mso-add-space:auto"> all sideburden nodes active vs <span
style="mso-spacerun:yes"> </span>nodes on models edge active<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="margin-bottom:0cm;margin-bottom:
.0001pt;mso-add-space:auto;text-indent:-18.0pt;mso-list:l0
level1 lfo1"><!--[if !supportLists]--><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri"><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman""> </span></span></span><!--[endif]-->*<i
style="mso-bidi-font-style:normal">Contact Permeability</i>
and permeability of sideburden<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri"><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman""> </span></span></span><!--[endif]--><i
style="mso-bidi-font-style:normal">Augmented Lagrange </i>contact
formulation<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri"><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman""> </span></span></span><!--[endif]-->reduction
of penetration tolerance<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri"><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman""> </span></span></span><!--[endif]-->swapping
of master and slave surface<o:p></o:p></p>
<p class="MsoListParagraphCxSpLast"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;
mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri"><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman""> </span></span></span><!--[endif]-->modification
of contact stiffness<o:p></o:p></p>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt">Yet stress
changes with contact are still not the ones expected from the
analytical solution and the model without contact.<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"> </p>
<p> </p>
<font size="-1">Thanks in advance for any input or discussion</font><br>
<pre class="moz-signature" cols="72">--
Freundliche Grüße / Kind regards
Constantin Haug
..................................................
M.Sc. Constantin Haug
Institut für Angewandte Geowissenschaften / Institue of Applied Geosciences
Technische Universität Darmstadt
Schnittspahnstraße 9
D-64287 Darmstadt
Germany
Tel.: ++49 - (0) - 6151 - 1622347
Fax: ++49 - (0) - 6151 - 166539
email: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:haug@geo.tu-darmstadt.de">haug@geo.tu-darmstadt.de</a>
Homepage: <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.geo.tu-darmstadt.de">http://www.geo.tu-darmstadt.de</a></pre>
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