# Geogrid showing no response in output

**URL:** <https://forum.itascainternational.com/t/geogrid-showing-no-response-in-output/1459>\
**Category:** Uncategorized\
**Created:** [May 16, 2024, 7:55pm UTC](https://forum.itascainternational.com/t/geogrid-showing-no-response-in-output/1459 "2024-05-16T19:55:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Newuser](https://avatars.discourse-cdn.com/v4/letter/n/3e96dc/32.png) [@Newuser](https://forum.itascainternational.com/u/Newuser)\
**Post date:** [May 16, 2024, 7:55pm UTC](https://forum.itascainternational.com/t/geogrid-showing-no-response-in-output/1459/1 "2024-05-16T19:55:54Z")

</div>

Hi [@everyone](https://forum.itascainternational.com/groups/everyone), [@itascan](https://forum.itascainternational.com/groups/itascan)  
Can you please have a look at the program below. Do you see anything missing with the geogrids or anything else that I am not getting change in the output with and without addition of geogrid layers?

model restore ‘initial’  
zone gridpoint ini disp 0 0 0  
zone gridpoint initialize fluid-modulus 2e6  
zone gridpoint ini fluid-tension -1e20  
zone history name ‘S\_pg\_1=0’ displacement-z position (0.5,0.5,-0.1)  
zone history name ‘S\_Pg\_2=-2’ displacement-z position (0.5,0.5,-2)  
zone history name ‘S\_Pg\_3=-8’ displacement-z position (0.5,0.5,-8)

; mechanical properties for fill  
zone cmodel assign mohr-coulomb range group ‘L1’  
zone property density 2100 young 70e6 poiss 0.3 …  
friction 36 cohesion 61000 dilation 3 range group ‘L1’  
; set saturation to 0 for nodes in the fill  
zone gridpoint ini saturation 0 range group ‘L1’ …  
pos-z 0.1 0.51  
; create piles - put top node in fill  
structure pile create by-line (0.0975, 0.0975, 0.05) (0.0975, 0.0975, -8.4) segments=36  
structure pile property young=1.8e10 poisson=0.2 cross-sectional-area=0.038025 …  
torsion-constant=0.0 moi-y=0 moi-z=0 perimeter=0.78 …  
coupling-stiffness-shear=6.03e9 …  
coupling-cohesion-shear=35000 …  
coupling-friction-shear=0 …  
coupling-stiffness-normal=0 …  
coupling-cohesion-normal=0 …  
coupling-friction-normal=0 coupling-gap-normal=off  
; =======================================================  
;; Assigning interface  
structure pile property coupling-stiffness-shear=6.03e9 …  
coupling-cohesion-shear=45000 coupling-friction-shear 0 range position-z -4 0.05;  
; Include end-bearing effect  
structure link delete range position-z -8.4  
structure link create target zone group ‘End’ range position-z -8.4  
structure link attach x=normal-yield y=free z=free …  
range group ‘End’  
structure link attach rotation-x=free rotation-y=free rotation-z=free …  
range group ‘End’  
structure link property x area=1 stiffness=1.8e11 yield-compression=44691 …  
range group ‘End’  
;  
; Create two geogrid layers, and assign properties  
structure geogrid create by-quadrilateral (0,0,0.2) (1,0,0.2) …  
(1,1,0.2) (0,1,0.2) size (1,1)  
structure geogrid create by-quadrilateral (0,0,0.4) (1,0,0.4) …  
(1,1,0.4) (0,1,0.4) size (1,1)  
structure geogrid cmodel assign elastic  
structure geogrid property young 1.04e8 poisson 0.3 thickness=5e-3 …  
coupling-stiffness=2.3e6 coupling-cohesion=0.0 …  
coupling-friction=25 ; 25 coupling friction!  
model fluid flow off;  
model solve ratio 1e-3