TY - GEN
T1 - Cyclic Behavior and Liquefaction Resistance of Fine Coal Refuse -Experimental and Numerical Modeling
AU - Salam, Sajjad
AU - Xiao, Ming
AU - Khosravifar, Arash
AU - Wang, Jintai
N1 - Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019
Y1 - 2019
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.
AB - 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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U2 - 10.1061/9780784482100.024
DO - 10.1061/9780784482100.024
M3 - Conference contribution
AN - SCOPUS:85063452279
SN - 9780784482100
T3 - Geotechnical Special Publication
SP - 229
EP - 238
BT - Geotechnical Special Publication
A2 - Meehan, Christopher L.
A2 - Kumar, Sanjeev
A2 - Pando, Miguel A.
A2 - Coe, Joseph T.
PB - American Society of Civil Engineers (ASCE)
T2 - 8th International Conference on Case Histories in Geotechnical Engineering: Earthquake Engineering and Soil Dynamics, Geo-Congress 2019
Y2 - 24 March 2019 through 27 March 2019
ER -