Uneingeschränkter Zugang

Hydraulic Characterization of a Self-Weight Compacted Coal

Antonio Mario Federico
Antonio Mario Federico
, 
Osvaldo Bottiglieri
Osvaldo Bottiglieri
, 
Francesco Cafaro
Francesco Cafaro
 und 
Gaetano Elia
Gaetano Elia
   | 19. März 2020
Studia Geotechnica et Mechanica's Cover Image
Über diesen Artikel
Vorheriger Artikel
Nächster Artikel
Zitieren
Article Category: Research Article
Online veröffentlicht: 19. März 2020
Seitenbereich: 48 - 60
Eingereicht: 02. Mai 2019
Akzeptiert: 17. Sept. 2019
DOI: https://doi.org/10.2478/sgem-2019-0031
Schlüsselwörter
© 2020 Antonio Mario Federico et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Figure 1

Particle size distribution of two coal samples.
Particle size distribution of two coal samples.

Figure 2

Block of Indonesian Coal subjected to swelling/shrinkage test.
Block of Indonesian Coal subjected to swelling/shrinkage test.

Figure 3

PVC cylindrical cell for the preliminary evaluation of the water retention potential of the coal.
PVC cylindrical cell for the preliminary evaluation of the water retention potential of the coal.

Figure 4

Dry unit weights of coal cylindrical samples and physical model
Dry unit weights of coal cylindrical samples and physical model

Figure 5

a) View of coal during drying at room temperature; b) phase of prototype filling
a) View of coal during drying at room temperature; b) phase of prototype filling

Figure 6

a) Location of the mini-tensiometers; b) continuous data logging system; c) details of the mini-tensiometers
a) Location of the mini-tensiometers; b) continuous data logging system; c) details of the mini-tensiometers

Figure 7

Spillways detail and filtering sheets: a) first layer; b) second layer
Spillways detail and filtering sheets: a) first layer; b) second layer

Figure 8

First imbibition phase: experimental data and corresponding numerical results
First imbibition phase: experimental data and corresponding numerical results

Figure 9

Water retention curves
Water retention curves

Figure 10

Conductivity functions
Conductivity functions

Figure 11

Comparison between measured and predicted variation of suction with time at ch1
Comparison between measured and predicted variation of suction with time at ch1

Figure 12

Predicted infiltration due to: (a) an extreme rainfall event through an initially wet stockpile; (b) an extreme rainfall event through an initially dry stockpile; (c) a constant rainfall through an initially wet stockpile; (d) a constant rainfall through an initially dry stockpile.
Predicted infiltration due to: (a) an extreme rainfall event through an initially wet stockpile; (b) an extreme rainfall event through an initially dry stockpile; (c) a constant rainfall through an initially wet stockpile; (d) a constant rainfall through an initially dry stockpile.

Physical-volumetric parameters of the coal cylindrical samples: a) at initial state; b) after imbibition

a)
Samplew0γ0 (kN/m3)Gs*γd (kN/m3)e0Srθdrying procedure / time (day)
115.9%8.41.27.20.6330%0.12hygroscopic / -
39.7%8.51.27.80.5223%0.08free drying / 2
27.7%8.51.27.90.4919%0.06free drying / 4
40.0%7.71.27.70.520%0.00oven drying at 105°C / 2

Matric suction values measured along the central vertical of the prototype model: a) at initial state; b) during the drying phase

a)
ch1ch2ch3
(kPa)(kPa)(kPa)
61.956.365.1

Hydraulic function parameters: a) at the first infiltration test; b) at the second infiltration test

a)
θrθ0αa=1/αn′ksl
(kPa)−1(kPa)(m/s)
0.01650.30141.6700.5981.7038.0E-041

Compositional data of the coal

DeterminationStandard/MethodWeight (%)Note
Moisture in the Analysis Sample*ISO 11722:199911.1Air Dried Basis
Ash Content*ISO 1171:2010 (E)5.8As Received Basis
Volatile Matter*ISO 562:2010 (E)37.4As Received Basis
Fixed Carbon*By calculation42.3As Received Basis
Carbon**ASTM D 5373-0865.7Air Dried Basis
Hydrogen**ASTM D 5373-084.4Air Dried Basis
Nitrogen**ASTM D 5373-081.3Air Dried Basis
Sulphur**ASTM D 4239-100.8Air Dried Basis
Oxygen**By calculation10.7Air Dried Basis

Hydraulic properties of the Indonesian coal in comparison to other granular materials

Materiala (kPa)ks (m/s)
Indonesian Coal – virgin state(present study)0.608.0E-4
Indonesian Coal – after collapse(present study)1.231.0E-5
Silty Clayey Sand(Cafaro et al. 2008)0.631.58E-6
Pervious Concrete – different mixtures(Marzulli et al. 2018)3.071.562E-45E-3
Sand(Lu and Likos 2004)103E-4

WRC parameters for the drying phase following the first imbibition stage

θrθ0αa=1/αn′
(kPa)−1(kPa)
0.01650.30140.8121.2311.703

Physical-volumetric state of the coal in the prototype model during the drying phases

After 7 days of drying at room temperature
wW (N)Wd(N)H (m)V (m3)Gs*
17.70%209617810.8950.22381.20
γ (kN/m3)γd (kN/m3)enSrθ
9.377.960.480.3244.39%0.144
After 14 days of drying at room temperature
wW (N)Wd (N)H (m)V (m3)Gs*
16.73%208217810.8950.22381.20
γ (kN/m3)γd (kN/m3)enSrθ
9.317.960.480.3241.97%0.136

Physical-volumetric parameters of the coal in the prototype model: a) at initial state; b) after volumetric collapse

a)
w0W0 (N)Wd(N)H (m)V (m3)Gs*
11.21%198417841.0020.25051.20
γ (kN/m3)γd (kN/m3)enSrθ
7.927.120.650.3920.61%0.081
eISSN:
2083-831X
Sprache:
Englisch
Zeitrahmen der Veröffentlichung:
4 Hefte pro Jahr
Fachgebiete der Zeitschrift:
Geowissenschaften, andere, Materialwissenschaft, Verbundwerkstoffe, Poröse Materialien, Physik, Mechanik und Fluiddynamik
Zeitschrift RSS Feed