Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling

Sajjad Salam, Ming Xiao, Arash Khosravifar, Jintai Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Fine coal refuse (FCR) is the waste produced in mining process. FCR can be classified as low-plasticity to non-plastic sandy silt or silty sand. Although FCR consists of appreciable amount of fines content (30% to 60%), there is a high liquefaction potential for hydraulically deposited FCR in impoundments due to its loose and saturated structure as well as its low permeability. Therefore, dynamic properties, particularly liquefaction resistance, of FCR should be investigated. In this study, cyclic direct simple shear (DSS) tests were performed on reconstituted samples of FCR to determine its dynamic properties and liquefaction resistance. Slurry deposition method, which mimics the fabric and structure of hydraulically deposited soils, was used to prepare representative samples of FCR. In addition, the results of cyclic DSS tests were used to calibrate plasticity constitutive models developed to simulate liquefiable materials. PM4Sand and PM4Silt are plasticity models that are developed to obtain monotonic and cyclic undrained shear behavior of liquefiable materials, for sands and low plasticity silts or clays, respectively. It was of interest to find which model better represents the dynamic characteristics of FCR since the material is composed of both silt and sand and exhibited behavior that could be characterized as both liquefaction and cyclic-softening. Therefore, the PM4Sand and PM4Silt constitutive models were calibrated for FCR using the DSS experimental results in FLAC, a 2-dimensional finite-difference program. The simulation results were compared against the experimental results. This research revealed the applicability as well as limitations of the two constitutive liquefaction models in simulating the cyclic shear response of fine coal refuse.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
EditorsJoseph T. Coe, Christopher L. Meehan, Sanjeev Kumar, Miguel A. Pando
PublisherAmerican Society of Civil Engineers (ASCE)
Pages229-238
Number of pages10
EditionGSP 308
ISBN (Electronic)9780784482070, 9780784482087, 9780784482094, 9780784482100, 9780784482117, 9780784482124, 9780784482131, 9780784482148, 9780784482155, 9780784482162
DOIs
StatePublished - Jan 1 2019
Event8th International Conference on Case Histories in Geotechnical Engineering: Earthquake Engineering and Soil Dynamics, Geo-Congress 2019 - Philadelphia, United States
Duration: Mar 24 2019Mar 27 2019

Publication series

NameGeotechnical Special Publication
NumberGSP 308
Volume2019-March
ISSN (Print)0895-0563

Conference

Conference8th International Conference on Case Histories in Geotechnical Engineering: Earthquake Engineering and Soil Dynamics, Geo-Congress 2019
CountryUnited States
CityPhiladelphia
Period3/24/193/27/19

Fingerprint

Liquefaction
refuse
liquefaction
Coal
coal
modeling
Plasticity
plasticity
Sand
Silt
dynamic property
Constitutive models
shear test
sand
silt
FLAC
impoundment
softening
slurry
Clay

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

Cite this

Salam, S., Xiao, M., Khosravifar, A., & Wang, J. (2019). Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling. In J. T. Coe, C. L. Meehan, S. Kumar, & M. A. Pando (Eds.), Geotechnical Special Publication (GSP 308 ed., pp. 229-238). [024] (Geotechnical Special Publication; Vol. 2019-March, No. GSP 308). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784482100.024
Salam, Sajjad ; Xiao, Ming ; Khosravifar, Arash ; Wang, Jintai. / Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling. Geotechnical Special Publication. editor / Joseph T. Coe ; Christopher L. Meehan ; Sanjeev Kumar ; Miguel A. Pando. GSP 308. ed. American Society of Civil Engineers (ASCE), 2019. pp. 229-238 (Geotechnical Special Publication; GSP 308).
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abstract = "Fine coal refuse (FCR) is the waste produced in mining process. FCR can be classified as low-plasticity to non-plastic sandy silt or silty sand. Although FCR consists of appreciable amount of fines content (30{\%} to 60{\%}), there is a high liquefaction potential for hydraulically deposited FCR in impoundments due to its loose and saturated structure as well as its low permeability. Therefore, dynamic properties, particularly liquefaction resistance, of FCR should be investigated. In this study, cyclic direct simple shear (DSS) tests were performed on reconstituted samples of FCR to determine its dynamic properties and liquefaction resistance. Slurry deposition method, which mimics the fabric and structure of hydraulically deposited soils, was used to prepare representative samples of FCR. In addition, the results of cyclic DSS tests were used to calibrate plasticity constitutive models developed to simulate liquefiable materials. PM4Sand and PM4Silt are plasticity models that are developed to obtain monotonic and cyclic undrained shear behavior of liquefiable materials, for sands and low plasticity silts or clays, respectively. It was of interest to find which model better represents the dynamic characteristics of FCR since the material is composed of both silt and sand and exhibited behavior that could be characterized as both liquefaction and cyclic-softening. Therefore, the PM4Sand and PM4Silt constitutive models were calibrated for FCR using the DSS experimental results in FLAC, a 2-dimensional finite-difference program. The simulation results were compared against the experimental results. This research revealed the applicability as well as limitations of the two constitutive liquefaction models in simulating the cyclic shear response of fine coal refuse.",
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Salam, S, Xiao, M, Khosravifar, A & Wang, J 2019, Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling. in JT Coe, CL Meehan, S Kumar & MA Pando (eds), Geotechnical Special Publication. GSP 308 edn, 024, Geotechnical Special Publication, no. GSP 308, vol. 2019-March, American Society of Civil Engineers (ASCE), pp. 229-238, 8th International Conference on Case Histories in Geotechnical Engineering: Earthquake Engineering and Soil Dynamics, Geo-Congress 2019, Philadelphia, United States, 3/24/19. https://doi.org/10.1061/9780784482100.024

Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling. / Salam, Sajjad; Xiao, Ming; Khosravifar, Arash; Wang, Jintai.

Geotechnical Special Publication. ed. / Joseph T. Coe; Christopher L. Meehan; Sanjeev Kumar; Miguel A. Pando. GSP 308. ed. American Society of Civil Engineers (ASCE), 2019. p. 229-238 024 (Geotechnical Special Publication; Vol. 2019-March, No. GSP 308).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - Fine coal refuse (FCR) is the waste produced in mining process. FCR can be classified as low-plasticity to non-plastic sandy silt or silty sand. Although FCR consists of appreciable amount of fines content (30% to 60%), there is a high liquefaction potential for hydraulically deposited FCR in impoundments due to its loose and saturated structure as well as its low permeability. Therefore, dynamic properties, particularly liquefaction resistance, of FCR should be investigated. In this study, cyclic direct simple shear (DSS) tests were performed on reconstituted samples of FCR to determine its dynamic properties and liquefaction resistance. Slurry deposition method, which mimics the fabric and structure of hydraulically deposited soils, was used to prepare representative samples of FCR. In addition, the results of cyclic DSS tests were used to calibrate plasticity constitutive models developed to simulate liquefiable materials. PM4Sand and PM4Silt are plasticity models that are developed to obtain monotonic and cyclic undrained shear behavior of liquefiable materials, for sands and low plasticity silts or clays, respectively. It was of interest to find which model better represents the dynamic characteristics of FCR since the material is composed of both silt and sand and exhibited behavior that could be characterized as both liquefaction and cyclic-softening. Therefore, the PM4Sand and PM4Silt constitutive models were calibrated for FCR using the DSS experimental results in FLAC, a 2-dimensional finite-difference program. The simulation results were compared against the experimental results. This research revealed the applicability as well as limitations of the two constitutive liquefaction models in simulating the cyclic shear response of fine coal refuse.

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Salam S, Xiao M, Khosravifar A, Wang J. Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling. In Coe JT, Meehan CL, Kumar S, Pando MA, editors, Geotechnical Special Publication. GSP 308 ed. American Society of Civil Engineers (ASCE). 2019. p. 229-238. 024. (Geotechnical Special Publication; GSP 308). https://doi.org/10.1061/9780784482100.024