Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigating Mechanical Behaviors of Rocks Under Freeze–Thaw Cycles Using Discrete Element Method
https://orcid.org/0000-0001-5382-1003
Abstract In this study, we adopt the Discrete Element Method (DEM) to evaluate the influence of Freeze–Thaw Cycles (FTCs) action on the mechanical properties of rock. To overcome the intrinsic porosity limitation of DEM model and better represent the saturated rock sample, we develop an algorithm to include particles of smaller and varying sizes into rock pores. The ice–water phase change and the resulting accumulation of residual strain are considered by developing an elastoplastic parallel bond model in $ PFC^{2D} $. The rationality of this model is first validated by comparing numerical results with published experimental data. Numerical results highlight the FTCs deterioration of the uniaxial compressive strength (UCS) and Young’s modulus of rock specimens. We establish exponential correlations between the FTCs number and the rock’s mechanical property, with the trends consistent with experimental observations. Inter-particle contact damage also reflects the formation and distribution of micro-fractures in rock specimens under freeze–thaw cyclic treatments. Based on the elastoplastic parallel bond model, we explore the influences of porosity and initial UCS on decay constant which reflects the freeze–thaw resistance of rock. It is found that decay constants of UCS and Young’s modulus decrease with the increase of porosity. While the decay of UCS decreases with the increase of initial UCS, which means the sample of larger initial UCS is harder to be deteriorated by FTCs. This study provides new insights into the rock degradation process under changing climate and may contribute to the future design and assessment of climate-resilient infrastructure.
Highlights The developed and validated elastoplastic parallel bond model captures the irreversible damage accumulated during the freeze-thaw cycles.The uniaxial compressive strength and Young’s modulus decrease with the increase of freeze-thaw cycles following an exponential correlation.Under freezing-thawing impact, decay constant of uniaxial compressive strength decreases with increasing porosity and initial rock strength.
Investigating Mechanical Behaviors of Rocks Under Freeze–Thaw Cycles Using Discrete Element Method
https://orcid.org/0000-0001-5382-1003
Abstract In this study, we adopt the Discrete Element Method (DEM) to evaluate the influence of Freeze–Thaw Cycles (FTCs) action on the mechanical properties of rock. To overcome the intrinsic porosity limitation of DEM model and better represent the saturated rock sample, we develop an algorithm to include particles of smaller and varying sizes into rock pores. The ice–water phase change and the resulting accumulation of residual strain are considered by developing an elastoplastic parallel bond model in $ PFC^{2D} $. The rationality of this model is first validated by comparing numerical results with published experimental data. Numerical results highlight the FTCs deterioration of the uniaxial compressive strength (UCS) and Young’s modulus of rock specimens. We establish exponential correlations between the FTCs number and the rock’s mechanical property, with the trends consistent with experimental observations. Inter-particle contact damage also reflects the formation and distribution of micro-fractures in rock specimens under freeze–thaw cyclic treatments. Based on the elastoplastic parallel bond model, we explore the influences of porosity and initial UCS on decay constant which reflects the freeze–thaw resistance of rock. It is found that decay constants of UCS and Young’s modulus decrease with the increase of porosity. While the decay of UCS decreases with the increase of initial UCS, which means the sample of larger initial UCS is harder to be deteriorated by FTCs. This study provides new insights into the rock degradation process under changing climate and may contribute to the future design and assessment of climate-resilient infrastructure.
Highlights The developed and validated elastoplastic parallel bond model captures the irreversible damage accumulated during the freeze-thaw cycles.The uniaxial compressive strength and Young’s modulus decrease with the increase of freeze-thaw cycles following an exponential correlation.Under freezing-thawing impact, decay constant of uniaxial compressive strength decreases with increasing porosity and initial rock strength.
Investigating Mechanical Behaviors of Rocks Under Freeze–Thaw Cycles Using Discrete Element Method
https://orcid.org/0000-0001-5382-1003
Abstract In this study, we adopt the Discrete Element Method (DEM) to evaluate the influence of Freeze–Thaw Cycles (FTCs) action on the mechanical properties of rock. To overcome the intrinsic porosity limitation of DEM model and better represent the saturated rock sample, we develop an algorithm to include particles of smaller and varying sizes into rock pores. The ice–water phase change and the resulting accumulation of residual strain are considered by developing an elastoplastic parallel bond model in $ PFC^{2D} $. The rationality of this model is first validated by comparing numerical results with published experimental data. Numerical results highlight the FTCs deterioration of the uniaxial compressive strength (UCS) and Young’s modulus of rock specimens. We establish exponential correlations between the FTCs number and the rock’s mechanical property, with the trends consistent with experimental observations. Inter-particle contact damage also reflects the formation and distribution of micro-fractures in rock specimens under freeze–thaw cyclic treatments. Based on the elastoplastic parallel bond model, we explore the influences of porosity and initial UCS on decay constant which reflects the freeze–thaw resistance of rock. It is found that decay constants of UCS and Young’s modulus decrease with the increase of porosity. While the decay of UCS decreases with the increase of initial UCS, which means the sample of larger initial UCS is harder to be deteriorated by FTCs. This study provides new insights into the rock degradation process under changing climate and may contribute to the future design and assessment of climate-resilient infrastructure.
Highlights The developed and validated elastoplastic parallel bond model captures the irreversible damage accumulated during the freeze-thaw cycles.The uniaxial compressive strength and Young’s modulus decrease with the increase of freeze-thaw cycles following an exponential correlation.Under freezing-thawing impact, decay constant of uniaxial compressive strength decreases with increasing porosity and initial rock strength.
Investigating Mechanical Behaviors of Rocks Under Freeze–Thaw Cycles Using Discrete Element Method
Huang, Chenchen (Autor:in) / Zhu, Cheng (Autor:in) / Ma, Yifei (Autor:in) / Aluthgun Hewage, Shaini (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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