Fatigue fracture and energy evolution characteristics of sandstone under water–ice phase transitions via the discrete element method

Computers and Geotechnics, Journal Year: 2025, Volume and Issue: 179, P. 107023 - 107023

Published: Jan. 9, 2025

Language: Английский

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Fatigue characteristics and energy evolution analysis of red sandstone under the coupling of freeze–thaw and cyclic loading

International Journal of Fatigue, Journal Year: 2024, Volume and Issue: 185, P. 108331 - 108331

Published: April 15, 2024

Language: Английский

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Mechanical properties and failure modes of discontinuous jointed considering water softening effects

Earth Science Informatics, Journal Year: 2025, Volume and Issue: 18(2)

Published: Jan. 20, 2025

Language: Английский

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Shear Mechanical Properties of Rock Joints Under Non-Uniform Load Based on DEM

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(8), P. 4257 - 4257

Published: April 12, 2025

Previous joint test studies have mainly been conducted under the condition of uniformly distributed loads, but in engineering, overlying loads are often non-uniformly distributed. It is necessary to investigate shear mechanical properties joints non-uniform loads. This paper establishes three typical models: far-field concentration (FFC), near-field (NFC), and focus on center (FOC). Direct simulations using DEM software PFC reveal that location load affects main parameters. The closer far end along direction, greater deformation rock mass during failure is, higher proportion cracks strength energy required for are. Compared a (UD) condition, FOC shows similar properties; NFC yields inferior outcomes, while FFC results superior performance compared UD. By utilizing machine learning, five prediction models developed, with Genetic-XGBoost algorithm demonstrating highest accuracy. Weight calculation indicate distribution form most critical factor influencing strength.

Language: Английский

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Analysis of cracks development and damage evolution in red sandstone under dry-wet cycles based on temporal and frequency characteristics of acoustic emission

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 94, P. 109849 - 109849

Published: June 8, 2024

Language: Английский

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A Fractional-Order Creep-Damage Model for Carbonaceous Shale Describing Coupled Damage Caused by Rainfall and Blasting

Fractal and Fractional, Journal Year: 2024, Volume and Issue: 8(8), P. 459 - 459

Published: Aug. 6, 2024

In order to better understand the shear creep behavior of weak interlayers (carbonaceous shale) under coupling effect rainfall dry–wet cycle and blasting vibration, as well quantitatively characterize coupled damage a series tests were carried out. The results show that combined vibration greatly intensifies carbonaceous shale, leading an increase in deceleration time, steady-state rate, decrease long-term strength. shale was characterized. Based on fractional-order theory, creep-damage constitutive model (DNFVP) established by introducing Abel dashpot describe wet–dry nonlinear acceleration characteristics. three-dimensional equation derived. effectiveness DNFVP verified through inversion parameters fitting experimental data, providing basis for in-depth research stability high slopes mines with interlayers.

Language: Английский

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Fatigue-thermal damage characteristics of red sandstone with a hole under high-temperature cyclic loading coupling and microstructural degradation

Journal of Materials Research and Technology, Journal Year: 2024, Volume and Issue: 33, P. 3250 - 3263

Published: Oct. 9, 2024

Language: Английский

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Multi-scale study on the fatigue mechanical properties and energy laws of thermal-damage granite under fatigue loading

International Journal of Damage Mechanics, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 22, 2024

To reveal the mechanical properties and energy laws of high-temperature rock mass engineering under fatigue disturbance, this paper conducted a multi-scale study on thermally damaged granite. First, macroscopic samples were studied. Secondly, law evolution was summarized based thermodynamic theory. Then, rockburst index introduced, NMR SEM technologies used to conduct discussion mechanism influence temperature. Finally, an improved nonlinear continuous damage model (INCDM) established, hardening growth rate low-cycle defined. The result shows that temperature first strengthens then weakens sample, with threshold 225°C. Temperatures below cause uneven expansion mineral particles squeeze natural pores, reduce porosity thus increase life strength sample. above dehydration phase change minerals such as quartz, feldspar, mica, forming transgranular/intergranular cracks, parallel cleavage stratification, reducing In addition, total energy, elastic dissipated density sample all show step-like increasing trend normalized cycle index. Energy storage satisfies linear law. Affected by accelerated release, dissipation changes from As increases, tendency increases decreases. failure sudden instability progressive mode. fatigue-thermal power law, compound function

Language: Английский

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Fatigue response and AE characteristics of soft and hard composite rock containing coplanar double joints

International Journal of Fatigue, Journal Year: 2025, Volume and Issue: unknown, P. 108994 - 108994

Published: April 1, 2025

Language: Английский

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Comparison of the Performance of a Novel Acrylate Metal Complexes with Common Consolidants for Historical Red Sandstone of Xumishan Grottoes in China

Published: Jan. 1, 2025

Language: Английский

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