Example of Swell Model

FLAC3D
1

Dear Itascans

Exists examples where using “swell model” to calibrate laboraty tests that looks like the image that I attached? Is it almost direct the use of the constants of the laboratory test into the logarithmic function of FLAC?

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Thanks in advance

2

I have calibrated now the one dimensional compression test (see Figure and the commands for FLAC8.1)

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; single zone swell test
;
new
grid 1 1
gen 0,0 0,1 1,1 1,0
model elastic
prop dens 1000 bulk 1e8 shear 3e7
apply pressure 8000000 j 2 ; variable
set gravity 10.
fix x i 1
fix x i 2
fix y j 1
solve
;
ini xd 0 yd 0 xv 0 yv 0
print sxx syy szz
model swell
prop bulk 1e8 shear 3e7 coh 1e10 tens=1e10
prop angle 0. a1 0.01 c1 -0.16 a3 0 c3 0 modnum 1
prop ninc 200 p_ref 1e5 sv0 0.0
def _num
_syy=syy(1,1)/1e6
_uy_top_num = ydisp(1,2)
end
his syy i 1 j 1
his ydisp i 1 j 2
step 200
solve srat 1e-4
_num
print _syy _uy_top_num
RETURN
However, How can I implemented the solution if the material presents swelling in all directions (thinking in 3D model, more specific in the normal vector of local axes)? thanks in advance.

3

Hello @MiguelN,
I am not sure this will be helpful, but I’d suggest looking at the FLAC3D Single Zones Swell model example as well as the documentation for the Swell Model in FLAC3D.

4

Hi @dblanksma

My problem is for example when I try to simulated a tunnel subjected to swelling. In this case, I dont have clear the property “normal” or “dip” + “dip-direction”. I know that in one dimensional compression test the normal vector of swelling is 0 0 1, but in a tunnel, is variable this parameter? thanks in advance