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Studia Geotechnica et Mechanica
Volume 46 (2024): Issue 1 (March 2024)
Open Access
Insights Into Estimation of Sand Permeability: From Empirical Relations to Microstructure-based Methods
Bartłomiej Bodak
Bartłomiej Bodak
and
Maciej Sobótka
Maciej Sobótka
| Mar 29, 2024
Studia Geotechnica et Mechanica
Volume 46 (2024): Issue 1 (March 2024)
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Article Category:
Original Study
Published Online:
Mar 29, 2024
Page range:
1 - 20
DOI:
https://doi.org/10.2478/sgem-2024-0001
Keywords
microtomography
,
permeability
,
conductivity
,
computational fluid dynamics
,
Kozeny–Carman equation
© 2024 Bartłomiej Bodak et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Figure 1:
Grain size distribution curves of analyzed samples.
Figure 2:
Setup for measurement.
Figure 3:
Permeameter fixture.
Figure 4:
General concept of a pore-network model.
Figure 5:
Analogous model of the resistor network.
Figure 6:
Rendered view of reconstructed a) sample 1, b) sample 2, and c) sample 3.
Figure 7:
Exemplary slice, volumes of interest and binarized image of a) sample 1, b) sample 2, and c) sample 3.
Figure 8:
Results of measurements in permeameter and best-fitting theoretical curves: a) sample 1, b) sample 2, and c) sample 3, and d) reference run without the sample attached. The vertical axis is scaled logarithmically for better fitting evaluation.
Figure 9:
Comparison of measured and simulated grain size distribution curves from different sizes of VOI for a) sample 1, b) sample 2, and c) sample 3.
Figure 10:
Relative differences between hydraulic conductivity calculated with data from simulated sifting and those from granulometric analysis.
Figure 11:
Tracks of random walkers after 1250 time steps in sample 3. Only 10% of all workers are shown for clarity.
Figure 12:
Pore network extracted from a) sample 1, b) sample 2, and c) sample 3 with a zoomed fragment of the network.
Figure 13:
Streamlines of flow calculated using LBM: a) sample 1, b) sample 2, and c) sample 3.
Figures 14:
Calculated and measured hydraulic conductivities for a) sample 1, b) sample 2, and c) sample 3.
Results of simulations using the lattice-Boltzmann method.
Sample no.
Sample name
VOI size
Porosity derived from image data
Permeability
Hydraulic conductivity at 10°C
[vx]
φ
img
[−]
k [μm
2
]
K [m/s]
1
Fine sand
400
3
0.365
23.489
1.758E-4
600
3
0.364
17.567
1.317E-4
2
Fine sand with lignite
400
3
0.511
20.923
1.565E-4
600
3
0.511
23.193
1.736E-4
3
Medium sand
400
3
0.309
16.778
1.259E-4
600
3
0.317
15.396
1.151E-4
Results of measurements with the described small-scale permeameter setup.
Sample no.
Sample name
Mean conductivity derived from the best-fit curve
Conductivity of the apparatus
Hydraulic conductivity in the measurement temperature
Hydraulic conductivity at 10°C
K
equiv
[m/s]
K
ap
[m/s]
K
ex
[m/s]
K
corr
[m/s]
1
Fine sand
2.663E-5
4.927E-3
2.678E-5
1.951E-5
2
Fine sand with lignite
4.457E-6
4.461E-6
3.250E-6
3
Medium sand
6.183E-5
6.262E-5
4.562E-5
Results of simulations using the pore-network modeling approach.
Sample no.
Sample name
VOI size
Porosity derived from image data
Permeability
Hydraulic conductivity at 10°C
[vx]
φ
img
[−]
k [μm
2
]
K [m/s]
1
Fine sand
400
3
0.365
23.666
1.786E-4
600
3
0.364
23.587
1.780E-4
800
3
0.363
24.061
1.816E-4
2
Fine sand with lignite
400
3
0.511
28.433
2.145E-4
600
3
0.511
27.969
2.110E-4
800
3
0.506
27.338
2.063E-4
3
Medium sand
400
3
0.309
17.311
1.306E-4
600
3
0.317
20.301
1.532E-4
800
3
0.317
22.087
1.667E-4
Measured properties of the samples.
Sample no.
Sample name
Soil type according to PN-EN ISO 14688-2:2018
Bulk density
Specific density
Porosity in loose state
Hydraulic conductivity in falling-head test at 10°C
Uniformity coefficient U=d
60
/d
10
GSD curve slope coefficient C=d
30
2
/(d
60
·d
10
)
[−]
ρ [g/cm
3
]
ρ
s
[g/cm
3
]
φ [−]
K [m/s]
U [−]
C [−]
1
Fine sand
FSa
1.549
2.634
0.412
1.702E-5
1.840
1.054
2
Fine sand with lignite
FSa
1.238
2.644
0.532
3.189E-6
2.532
1.027
3
Medium sand
MSa
1.652
2.654
0.377
4.067E-5
3.147
1.003
Results of estimation using the Kozeny–Carman equation.
Sample no.
Sample name
VOI size
Porosity derived from image data
Tortuosity in direction of the flow
Specific surface area per unit volume
Permeability
Hydraulic conductivity at 10°C
[vx]
φ
img
[−]
τ [−]
S [1/m]
k [μm
2
]
K [m/s]
1
Fine sand
400
3
0.365
1.937
38748
16.587
1.242E-4
600
3
0.364
1.935
38447
16.674
1.249E-4
800
3
0.363
1.897
37820
17.378
1.301E-4
2
Fine sand with lignite
400
3
0.511
1.732
72321
24.639
1.845E-4
600
3
0.511
1.722
73061
24.283
1.818E-4
800
3
0.506
1.763
72932
22.645
1.696E-4
3
Medium sand
400
3
0.309
2.009
40988
7.323
5.484E-4
600
3
0.317
1.980
40043
8.604
6.443E-4
800
3
0.317
1.946
37079
10.209
7.645E-4
Summary of used empirical formulae.
Method
Equation form
Coefficient C or C′
Porosity function f(φ)
Effective diameter d
e
Exponent m
Applicability
Seelheim (1880)
(5)
3570
1
d
50
2
Sands and clays
Hazen (1911)
(4)
6.0E-4
1+10(φ−0.26)
d
10
2
0.1 mm<d
10
<3 mm
*
U<5
Sauerbrey (1932)
(4)
3.75E-3
φ
3
/(1−φ)
2
d
17
2
d
17
<5 mm
USBR (
Říha et al., 2018
)
(4)
4.8E-4·(1000d
20
)
0.3
1
d
20
2
U<5
Beyer (1964)
(4)
6E-4·log(500/U)
1
d
10
2
0.06 mm<d
10
<0.6 mm
1<U<20
Chapuis et al. (2005)
(5)
1219.9
φ
2.3475
/(1−φ)
1.565
d
10
1.565
0.03 mm<d
10
<3 mm
Results of estimation using empirical equations.
Sample no.
Sample name
Method
Effective diameter
Effective diameter value
Hydraulic conductivity at 10°C
[−]
[−]
d
e
[mm]
K [m/s]
1
Fine sand
Seelheim
d
50
0.273
2.661E-4
Hazen
d
10
0.163
3.031E-4
Sauerbrey
d
17
0.189
2.045E-4
USBR
d
20
0.201
8.937E-5
Beyer
d
10
0.163
2.927E-4
Chapuis
d
10
0.163
4.125E-4
2
Fine sand with lignite
Seelheim
d
50
0.138
6.799E-5
Hazen
d
10
0.062
N/A
Sauerbrey
d
17
0.077
1.151E-4
USBR
d
20
0.082
1.150E-5
Beyer
d
10
0.062
3.994E-5
Chapuis
d
10
0.062
2.363E-4
3
Medium sand
Seelheim
d
50
0.381
5.182E-4
Hazen
d
10
0.143
2.01E-4
Sauerbrey
d
17
0.179
1.254E-4
USBR
d
20
0.196
8.531E-5
Beyer
d
10
0.143
2.037E-4
Chapuis
d
10
0.143
2.496E-4
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