Energy evolution law and catastrophic failure prediction of Luohe formation sandstone during rupture process experienced one freeze-thaw cycle

PLoS ONE, Journal Year: 2025, Volume and Issue: 20(5), P. e0321656 - e0321656

Published: May 8, 2025

To explore the energy damage evolution law and catastrophic failure characteristics of sandstone in Luohe Formation after thawing, uniaxial compression tests on one freeze-thaw cycle with different freezing temperatures were conducted. The mechanical properties mode thawed analyzed. Furthermore, its sensitivity to temperature during deformation investigated. Subsequently, a model was proposed predict time Formation. results showed that peak strength elastic modulus decrease temperature. modes can be classified into axial splitting failure, shear tensile-shear mixed failure. Additionally, temperature, strain release rate dissipation growth rock samples decrease. Energy process thawing is divided stages minor damage, deceleration steadily increase, accelerated sharply increase. presents clear critical power-law singularity behavior, characteristic value β roughly 0.7±0.1. prediction method yields imminent ( t f p =4.356 min) very close actual =4.376 at -10 °C, are good stable.

Language: Английский

Energy-based nonlinear damage creep model considering the influence of the concrete creep rate

Frontiers in Materials, Journal Year: 2025, Volume and Issue: 12

Published: May 19, 2025

In order to study the influence of confining pressure on deformation concrete, triaxial compression and creep tests under different pressures are carried out using a combination laboratory theoretical analysis. Based whole process curve concrete energy conservation theorem, viscoplastic accelerated models established by introducing loading rate equations at stages. Taking time stress as triggering conditions model, model parameters identified fitting test curve, nonlinear damage is established, which can better reflect development characteristics concrete. The results showed that curves closely matched results. newly describe failure stage levels. It effectively trend during stage. general, has high degree accuracy in capturing description

Language: Английский

Study on the mechanical properties, thermal properties, and microstructure of phase change concrete (PCC): The application of active frost resistance of concrete in frozen soil areas

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 449, P. 138491 - 138491

Published: Sept. 29, 2024

Language: Английский