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The effect of freezing and thawing cycles on the mechanical properties and slope stability of the waste dump

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Title: The effect of freezing and thawing cycles on the mechanical properties and slope stability of the waste dump
Authors: Xu Wenbin, Wang Jiachen, Luan Maoxu
Source: 矿业科学学报, Vol 7, Iss 2, Pp 154-165 (2022)
Publisher Information: Emergency Management Press, 2022.
Publication Year: 2022
Collection: LCC:Engineering geology. Rock mechanics. Soil mechanics. Underground construction
LCC:Mining engineering. Metallurgy
Subject Terms: waste dump, cold region, freezing and thawing cycle, mechanical property, stability, direct shear apparatus, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712, Mining engineering. Metallurgy, TN1-997
More Details: To investigate the shear strength evolution of soil-rock material in waste dump induced by freezing and thawing cycle (FTC), the shear tests are conducted by a self-developed direct shear apparatus, and the effect of FTCs on the shear strength degradation curve of soil-rock material is obtained. Furthermore, the inner microstructure of soil-rock material induced by FTC is analyzed by computer topography (CT)scanning testing.Finally, the stability of waste dump after and before freezing and thawing is compared. The results show that the shear and displacement curves of soil-rock material present strain softening during low normal loading pressure. However, the shear and displacement curve development trend changes from strain softening to strain hardening, and the shear dilatancy happens during loading process. As the FTCs increase, the strain hardening behavior becomes more obvious and the shear dilatancy effect is weakened. In addition, both the cohesion and friction angles decrease as the FTCs increase. When the number of FTC increases to 15, the decrement of cohesion and friction angle is 18.45 % and 9.42 %, respectively. The reason is mainly attributed to the dislocation and regroup of fine rock particles induced by freezing crack.The change in porosity of soil-rock material mainly happens within the initial 5 freezing and thawing cycles. The safety coefficient decrement of waste dump is approximately 7.6 % as the FTCs increase from 0 to 15. The results can provide guidance for waste dump in cold regions.
Document Type: article
File Description: electronic resource
Language: English
Chinese
ISSN: 2096-2193
Relation: https://doaj.org/toc/2096-2193
DOI: 10.19606/j.cnki.jmst.2022.02.002
Access URL: https://doaj.org/article/1c0dd190d77741d38ab0635b98c449c9
Accession Number: edsdoj.1c0dd190d77741d38ab0635b98c449c9
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  Data: The effect of freezing and thawing cycles on the mechanical properties and slope stability of the waste dump
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  Data: <searchLink fieldCode="AR" term="%22Xu+Wenbin%22">Xu Wenbin</searchLink><br /><searchLink fieldCode="AR" term="%22Wang+Jiachen%22">Wang Jiachen</searchLink><br /><searchLink fieldCode="AR" term="%22Luan+Maoxu%22">Luan Maoxu</searchLink>
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  Data: 矿业科学学报, Vol 7, Iss 2, Pp 154-165 (2022)
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  Data: Emergency Management Press, 2022.
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  Data: 2022
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  Data: LCC:Engineering geology. Rock mechanics. Soil mechanics. Underground construction<br />LCC:Mining engineering. Metallurgy
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  Data: <searchLink fieldCode="DE" term="%22waste+dump%22">waste dump</searchLink><br /><searchLink fieldCode="DE" term="%22cold+region%22">cold region</searchLink><br /><searchLink fieldCode="DE" term="%22freezing+and+thawing+cycle%22">freezing and thawing cycle</searchLink><br /><searchLink fieldCode="DE" term="%22mechanical+property%22">mechanical property</searchLink><br /><searchLink fieldCode="DE" term="%22stability%22">stability</searchLink><br /><searchLink fieldCode="DE" term="%22direct+shear+apparatus%22">direct shear apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22Engineering+geology%2E+Rock+mechanics%2E+Soil+mechanics%2E+Underground+construction%22">Engineering geology. Rock mechanics. Soil mechanics. Underground construction</searchLink><br /><searchLink fieldCode="DE" term="%22TA703-712%22">TA703-712</searchLink><br /><searchLink fieldCode="DE" term="%22Mining+engineering%2E+Metallurgy%22">Mining engineering. Metallurgy</searchLink><br /><searchLink fieldCode="DE" term="%22TN1-997%22">TN1-997</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: To investigate the shear strength evolution of soil-rock material in waste dump induced by freezing and thawing cycle (FTC), the shear tests are conducted by a self-developed direct shear apparatus, and the effect of FTCs on the shear strength degradation curve of soil-rock material is obtained. Furthermore, the inner microstructure of soil-rock material induced by FTC is analyzed by computer topography (CT)scanning testing.Finally, the stability of waste dump after and before freezing and thawing is compared. The results show that the shear and displacement curves of soil-rock material present strain softening during low normal loading pressure. However, the shear and displacement curve development trend changes from strain softening to strain hardening, and the shear dilatancy happens during loading process. As the FTCs increase, the strain hardening behavior becomes more obvious and the shear dilatancy effect is weakened. In addition, both the cohesion and friction angles decrease as the FTCs increase. When the number of FTC increases to 15, the decrement of cohesion and friction angle is 18.45 % and 9.42 %, respectively. The reason is mainly attributed to the dislocation and regroup of fine rock particles induced by freezing crack.The change in porosity of soil-rock material mainly happens within the initial 5 freezing and thawing cycles. The safety coefficient decrement of waste dump is approximately 7.6 % as the FTCs increase from 0 to 15. The results can provide guidance for waste dump in cold regions.
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RecordInfo BibRecord:
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        Value: 10.19606/j.cnki.jmst.2022.02.002
    Languages:
      – Text: English
      – Text: Chinese
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      Pagination:
        PageCount: 12
        StartPage: 154
    Subjects:
      – SubjectFull: waste dump
        Type: general
      – SubjectFull: cold region
        Type: general
      – SubjectFull: freezing and thawing cycle
        Type: general
      – SubjectFull: mechanical property
        Type: general
      – SubjectFull: stability
        Type: general
      – SubjectFull: direct shear apparatus
        Type: general
      – SubjectFull: Engineering geology. Rock mechanics. Soil mechanics. Underground construction
        Type: general
      – SubjectFull: TA703-712
        Type: general
      – SubjectFull: Mining engineering. Metallurgy
        Type: general
      – SubjectFull: TN1-997
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      – TitleFull: The effect of freezing and thawing cycles on the mechanical properties and slope stability of the waste dump
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            NameFull: Xu Wenbin
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            NameFull: Wang Jiachen
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            NameFull: Luan Maoxu
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              Y: 2022
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