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STRENGTH AND CONSOLIDATION BEHAVIOUR OF REMOLDED REDBED CLAYSTONE FROM THE MAE MOH LIGNITE MINE

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dc.contributor.authorDongol, Abhishek, author
dc.contributor.authorBareither, Christopher C.B, advisor
dc.contributor.authorChao, Kuo-Chieh K.C.C, advisor
dc.contributor.authorScalia IV, Joseph J.S., committee member
dc.contributor.authorGallen, Sean S.G., committee member
dc.date.accessioned2024-12-23T11:59:30Z
dc.date.available2025-12-20
dc.date.issued2024
dc.description.abstractThe objective of this study was to evaluate the strength and consolidation behavior of remolded Redbed claystone within a critical state framework. In 2018, a slope failure occurred in the northwestern waste rock pile at the Mae Moh Lignite mine in Thailand. A hypothesis of the failure was the slaking of the claystone at the base of the piles resulted in substantial strength loss relative to the intact blocky mass of the as-placed claystone waste rock. Consolidated undrained (CU) triaxial compression tests were conducted on 38-mm-diameter samples of remolded and intact specimens of the claystone. Remolded specimens were prepared from slurry and consolidated to form normally consolidated clay specimens. One dimensional consolidations test were conducted on remolded and intact claystone specimens prepared in a similar manner. The remolded specimens exhibited contractive, strain-softening behavior in undrained shear typical of normally consolidated clays with effective friction angles ranging between 20° and 21° (M = 0.8). The intact claystone exhibited stiff, dilative behavior in undrained compression with higher shear strength parameters (M = 1.11-1.66). One dimensional consolidation tests on remolded specimens yielded only virgin compression, whereas similar tests on in-tact specimens yielded only negligible recompression. The claystone transitioned from a strong, stiff, dilative material to a soft, contractive soil with a drastic reduction in strength and an increase in compressibility. A modified Cam Clay model was parameterized from the triaxial and consolidation results to model the shear behavior of remolded Redbed claystone. The model predictions showed good agreement with observed laboratory test data, which supports the use of the model to in advanced stress-deformation modeling of the waste rock piles at Mae Moh Lignite Mine.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierDongol_colostate_0053N_18710.pdf
dc.identifier.urihttps://hdl.handle.net/10217/239790
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2020-
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.rights.accessEmbargo expires: 12/20/2025.
dc.subjectCritical State Soil Mechanics
dc.subjectSlaking
dc.subjectFully Softened Strength
dc.subjectClaystone
dc.titleSTRENGTH AND CONSOLIDATION BEHAVIOUR OF REMOLDED REDBED CLAYSTONE FROM THE MAE MOH LIGNITE MINE
dc.typeText
dcterms.embargo.expires2025-12-20
dcterms.embargo.terms2025-12-20
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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