Damage model of unsaturated frozen soil while considering the influence of temperature rise under impact loading

Fu, Tiantian; Zhu, Zhiwu; Ma, Wei; Zhang, Fulai

doi:10.1016/j.mechmat.2021.104073

Cited by 19 publications

(4 citation statements)

References 52 publications

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“…But the rate of decrease of the stress-strain curve of frozen soil is relatively slower during unloading, and viscoelasticity appears in the ascent stage of the stress-strain curve (Li et al, 2022;Shangguan et al, 2020). Some scholars have improved viscoelastic models to describe the impact mechanical behaviors of frozen soil under different loading conditions (Cao et al, 2018;Fu et al, 2019bFu et al, , 2021. As shown in Figure 2(b), for a given strain rate, the peak stress decreased with increasing temperature, and the curves at different temperatures tended to converge, indicating that with increasing temperature, more ductility was exhibited in the specimen.…”

Section: Resultsmentioning

confidence: 99%

“…In terms of impact loading studies, Zhang et al (2021) established an equivalence relation between the strain rate and temperature based on the thermal activation theory and built a unified viscoplastic constitutive model with heat-related damage to describe the nonlinear strain hardening and strain softening of frozen soil. Based on the homogenization theory, Fu et al (2021) built a mesoscopic damage model of unsaturated frozen soil that can precisely reflect the mechanical damage, strain rate, and temperature effects of frozen soil subjected to impact loading. Based on the Zhu-Wang-Tang model, Ma et al (2017) proposed a nonlinear viscoelastic constitutive model to reflect the confining pressure effect of frozen soil under impact loading.…”

Section: Introductionmentioning

confidence: 99%

“…The evolution of cracks in frozen soil subjected to impact loading is difficult to observe, indicating that describing the weakening effect of every crack on its mechanical properties is unrealistic (Fu et al, 2019a). Although combining conventional experiments with some hypotheses and theories can reasonably predict the evolution of internal damage during failure (Cao et al, 2018;Fu et al, 2019aFu et al, , 2021Li et al, 2022;Ma et al, 2017), current research remains illegible or unintuitive for investigating the influence of impact loading and temperature on initiation and propagation of crack. Numerical simulations can be utilized to reconstruct the process of initiation and propagation of crack in frozen soil under impact loading.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Chunyu

Zhu

et al. 2022

International Journal of Damage Mechanics

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Many engineering activities have been conducted on permafrost. Frozen soil is subjected to impact loading, particularly during blasting and excavation projects. Thus, it is essential to study the impact mechanical properties of frozen soil. A split Hopkinson pressure bar (SHPB) experiment was conducted to investigate the mechanical responses of frozen soil specimens subjected to impact loading under different strain rates at different temperatures. Evident strain rate and temperature effects were also observed. As crack development in the specimens could not be observed experimentally, a two-dimensional particle flow code was utilized to numerically simulate SHPB impact experiments on frozen soil. A contact bonding model was used for the simulation. We assumed that only temperature could change the particle parameters. The parameters and establishment of the geometric model in the simulation were calibrated and validated by comparing them with the experimentally obtained impact stress–strain curves and wave signals. More influences of strain rate and temperature on crack development were presented intuitively in this study, in combination with the propagation of stress waves. The results of the numerical simulation demonstrated that when the frozen soil specimen was subjected to impact loading, shear failure was the primary failure in the specimen. For a given temperature, a lower strain rate decreased the number of cracks generated, increased the duration of crack generation, and delayed the formation of cracks. For a given strain rate, a lower temperature decreased the number of cracks generated and the duration of crack generation; however, the number of tensile cracks was negligibly affected by changes in temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Chunyu

Zhu

et al. 2022

International Journal of Damage Mechanics

Self Cite

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“…In this study, it was assumed that fractures within the matrix and the matrix were subjected to the same effective stress under an external load . Based on the superposition principle, the relationship between the mean effective stress and volume strain of the fractured matrix can be expressed as follows V normalm V 0 , m = D .25em exp false( − normalΔ σ m / K b false) + ( 1 − D ) ( 1 − Δ σ normalm k m ) ≈ ( A A 0 ) 3 / 2 …”

Section: Establishment Of the Permeability Modelmentioning

confidence: 99%

Permeability of Argillaceous Sandstone Modeled with Tortuous Capillary Tubes Using Fractal Geometry

Liu,

Xu,

Xiao

et al. 2023

Energy Fuels

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Quantitative characterization of rock permeability is important for enhancing the extraction efficiency of oil and gas resources and maintaining the long-term stability of deep underground engineering. Fractal theory can quantitatively describe the pore size distribution and tortuosity of the seepage channel. Therefore, a permeability model was proposed based on fractal theory and the capillary tube model. This permeability model considered the tortuosity of the seepage channel and the damage evolution within the rock. Permeability data for argillaceous sandstone at different temperatures, pore pressures, and confining pressures were used to validate the permeability model. The permeability model simultaneously captured the permeability decrease owing to the compaction effect of stress and permeability recovery owing to the damage effect of stress, verifying the accuracy and rationality of the permeability model. Permeability influence factors K f (damage effect) and K c (compaction effect) under different temperatures, pore pressures, and confining pressure conditions were examined. The confining pressure and temperature increased K c and decreased K f, respectively, suggesting that the permeability of the rock decreases and recovers more significantly at low confining pressures and temperatures. The effect of pore pressure on the permeability influence factor may depend on the failure pattern of the rock, which changes with the confining pressure. The permeability and permeability influence factors exhibited crossover, which is attributed to macro-fracture formation within the rock. The compaction and damage effects of stress changed with the temperature, pore pressure, and confining pressure, consequently resulting in changes in the evolution process of permeability. This study provides a theoretical reference for exploiting tight sandstone reservoirs.

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Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading

Xu,

Liu,

Xiao

et al. 2024

Rock Mech Rock Eng

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Damage model of unsaturated frozen soil while considering the influence of temperature rise under impact loading

Cited by 19 publications

References 52 publications

Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Permeability of Argillaceous Sandstone Modeled with Tortuous Capillary Tubes Using Fractal Geometry

Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading

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