<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<title>[Geoqus] On Geostatic Step</title>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PersonName"/>
<!--[if !mso]>
<style>
st1\:*{behavior:url(#default#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
p.MsoAutoSig, li.MsoAutoSig, div.MsoAutoSig
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
p
{mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman";}
span.EmailStyle19
{mso-style-type:personal;
font-family:Arial;
color:navy;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:Arial;
color:navy;}
@page Section1
{size:612.0pt 792.0pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-GB link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dear Wouter:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Really thank you for your kind and attention,
I will follow your comments for my modelling, also I should say thank you to
Jose For her comments as well.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Manooch <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
geoqus-bounces+manooch.salehabadi=pet.hw.ac.uk@lists.ruhr-uni-bochum.de
[mailto:geoqus-bounces+manooch.salehabadi=pet.hw.ac.uk@lists.ruhr-uni-bochum.de]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Wouter van der Zee<br>
<b><span style='font-weight:bold'>Sent:</span></b> 27 March 2007 22:53<br>
<b><span style='font-weight:bold'>To:</span></b> '<st1:PersonName w:st="on">Geoscientific
Abaqus User Group</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Geoqus] Far Field
Stresses</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Manooch,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>to incorporate the field
stresses, I would use:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>*initial conditions,
type=stress<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>and<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>*initial conditions,
type=pore pressure <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>and <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>*initial conditions,
type=ratio<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>To keep the stresses in
your model, either make your mesh large enough and hold the outside boundary in
1,2 direction, or use the infinite element as Jose pointed out. Be aware that
you should provide effective stresses, not total stresses.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Please note that from
your part of the input file it looks like you want to calculate time dependent
pore pressure (although you call your step “equilibrium step”). If
you want to calculate the equilibrium only them remove “</span></font><font
size=2><span lang=EN-US style='font-size:10.0pt'>consolidation,
end=PERIOD”, </span></font><font size=2 color=navy face=Arial><span
lang=EN-US style='font-size:10.0pt;font-family:Arial;color:navy'>it probably
makes convergence also more likely, and you don’t have to worry about the
permeability of your material. As soon as you understand your model, you can
switch to time-dependent modeling, and start playing with the permeability (and
unit system).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Good luck,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Wouter<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=3 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
geoqus-bounces+wvanderzee=geomi.com@lists.ruhr-uni-bochum.de
[mailto:geoqus-bounces+wvanderzee=geomi.com@lists.ruhr-uni-bochum.de] <b><span
style='font-weight:bold'>On Behalf Of </span></b><st1:PersonName w:st="on">Manooch
Salehabadi</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 27, 2007 3:52
PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Geoscientific
Abaqus User Group</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Far Field Stresses</span></font><span
lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div id=idOWAReplyText62246>
<div>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>Dear
All,<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>hi
and sorry for this simple question , i am just a beginner with ABAQUS.<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>i
am trying to model a bore hole in mohr coulomb media (rock) with plain strain
element CPE8RP, but i do not know how <o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>to
include far field stress in the model?<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>i
have used simple hollow cylindrical model with loading as following to simulate
far field stresses:<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'> <o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>*Step,
name="Equilibrium Step", nlgeom=YES<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>*Soils,
consolidation, end=PERIOD, utol=10., creep=none<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>100.,
14400., 0.144, 14400., <o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'> <o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>**
LOADS<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>**
<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>**
Name: Far Field Stress Type: Pressure<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>*Dsload<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>"Outer
Boundary Surface", P, 24.<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>**
Name: Mud Pressure-surface Type: Pressure<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>*Dsload<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>"wellbore
Face", P, 20.<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>**
<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>unit
is in MPa , i considered 24 Mpa as far field stress and 20 Mpa as borehole
pressure ,also i have considered<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>18
Mpa as an initial pore pressure , but i didnot get reasonable results.!<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>i
will be much appreciated for any comments.<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>Regards<o:p></o:p></span></font></p>
<p><font size=2 face="Times New Roman"><span lang=EN-US style='font-size:10.0pt'>Manooch
<o:p></o:p></span></font></p>
</div>
</div>
</div>
</body>
</html>