*HEADING
EI11PII1: PORE PRESS. INTERFACE, INITIAL CONDITIONS, TYPE=PRESSURE  [CONTACT PAIR]
*RESTART,WRITE
*NODE,NSET=NALL
1,1.,0.0
2,4.,0.0
3,4.,1.0
4,1.,1.0
5,2.5,0.0
6,4.,.5
7,2.5,1.0
8,1.,.5
11,1.,1.1
12,4.,1.1
13,4.,2.1
14,1.,2.1
15,2.5,1.1
16,4.,1.6
17,2.5,2.1
18,1.,1.6
*NSET,NSET=NBOT
1,2,5
*NSET,NSET=NTOP
13,14,17
*ELEMENT,TYPE=CPE8P,ELSET=CONT
4,1,2,3,4,5,6,7,8
5,11,12,13,14,15,16,17,18
*surface,NAME=MAS
4,S3
*surface,NAME=SLA
5,S1
*CONTACT PAIR,INTERACTION=ISLS, Small sliding
SLA, MAS
*SURFACE INTERACTION,NAME=ISLS
0.5,
*SOLID SECTION,ELSET=CONT,MATERIAL=CONT
.5, 
*MATERIAL,NAME=CONT
*ELASTIC
1.E8, 
*PERMEABILITY,SPECIFIC=1.0
1.E-4, 
*INITIAL CONDITIONS,TYPE=RATIO
NALL, 1.0
*INITIAL CONDITIONS,TYPE=POREPRESSURE
NALL, -50.0
*BOUNDARY
NALL,1
NBOT,2
NTOP,2
**
** DUMMY EQUILIBRIUM STEP
**
*STEP, UNSYMM=YES
*SOILS
1.0, 1.0
**
** GROUND NODE TO AVOID SINGULARITY
**
*BOUNDARY
1,8,8,-50.0
*NODE FILE
POR, 
*OUTPUT,FIELD
*NODE OUTPUT
POR,
*END STEP