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Mechanical properties and damage constitutive model of silty mudstone under heating and water-cooling cycles
Understanding the deformation and damage behaviors of soft rocks under temperatures and water–rock interactions is crucial for designing rock engineering structures and for assessing geotechnical disasters. Hence, the physical–mechanical characteristics and damage mechanisms of silty mudstone under heating and water-cooling cycles were determined by a series of laboratory tests. The results indicate that heating and water-cooling treatments prompt crack development within silty mudstone, observable through volume augmentation along with reductions in mass, density, and P-wave velocity. The interconnections between the decrease of mechanical properties such as elastic modulus, cohesion, and internal friction angle of silty mudstone and the factors including temperatures and cycle number are explicitly established. The deterioration of the physical–mechanical properties of silty mudstone primarily arises from the thermal expansion, dehydration, and hydrolysis of mineral constituents. Furthermore, a new damage constitutive model for silty mudstone considering temperature and the number of heating and water-cooling cycles is established based on lognormal distribution and the Mohr–Coulomb criterion. Additionally, the model parameters S0 and F0 characterize the homogeneity and average strength, enabling a quantitative assessment of the damage degree of rocks.
Mechanical properties and damage constitutive model of silty mudstone under heating and water-cooling cycles
Understanding the deformation and damage behaviors of soft rocks under temperatures and water–rock interactions is crucial for designing rock engineering structures and for assessing geotechnical disasters. Hence, the physical–mechanical characteristics and damage mechanisms of silty mudstone under heating and water-cooling cycles were determined by a series of laboratory tests. The results indicate that heating and water-cooling treatments prompt crack development within silty mudstone, observable through volume augmentation along with reductions in mass, density, and P-wave velocity. The interconnections between the decrease of mechanical properties such as elastic modulus, cohesion, and internal friction angle of silty mudstone and the factors including temperatures and cycle number are explicitly established. The deterioration of the physical–mechanical properties of silty mudstone primarily arises from the thermal expansion, dehydration, and hydrolysis of mineral constituents. Furthermore, a new damage constitutive model for silty mudstone considering temperature and the number of heating and water-cooling cycles is established based on lognormal distribution and the Mohr–Coulomb criterion. Additionally, the model parameters S0 and F0 characterize the homogeneity and average strength, enabling a quantitative assessment of the damage degree of rocks.
Mechanical properties and damage constitutive model of silty mudstone under heating and water-cooling cycles
Acta Geotech.
Fu, Hongyuan (Autor:in) / Yu, Xiaowei (Autor:in) / Zeng, Ling (Autor:in) / Luo, Jintao (Autor:in) / Liu, Jie (Autor:in)
Acta Geotechnica ; 19 ; 5031-5050
01.08.2024
20 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Damage constitutive model , Heating and water-cooling cycles , Residual strength , Silty mudstone , Temperature Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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