Experimental study on mechanical and damage model of red sandstone subjected to high-temperature cooling impact cycling

• Published in: Thermal science and engineering progress Vol. 65; p. 103938
• Main Authors: Jiang, Haopeng, Yin, Wei, Zhang, Kun, Zhang, Fengrui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2025
• Subjects: Damage model; High-temperature cooling; Impact cycling; Red sandsone; Rock mechancics; Damage model; Red sandsone; Impact cycling; Rock mechancics; High-temperature cooling
• ISSN: 2451-9049
• DOI: 10.1016/j.tsep.2025.103938

•Uniaxial compression tests and cyclic dynamic impact tests were conducted on red sandstone.•The mechanical properties of red sandstone under cyclic dynamic impacts were comparatively analyzed.•A statistical damage constitutive model for red sandstone was established based on the Logistic distribution. The mechanical properties of high-temperature rocks after cooling under different methods directly impact the safety of deep geotechnical engineering construction. Using red sandstone as the research subject, uniaxial compression tests and cyclic dynamic impact tests were conducted on specimens subjected to cyclic natural cooling and water quenching at 600 °C. The variations in the mechanical properties of red sandstone were comparatively analyzed. A statistical damage constitutive model for red sandstone was established by introducing load-induced damage variables and thermal-cyclic cooling damage variables, with the corresponding parameter expressions determined. The applicability and rationality of the constitutive model were verified. The results indicate that in uniaxial compression tests, as the number of thermal cycles increases, microcracks inside the red sandstone propagate and coalesce to form macroscopic fractures, leading to a decline in specimen mass and longitudinal wave velocity. The elastic deformation stage in the static stress–strain curve gradually shortens, accompanied by a pronounced unstable failure stage. The cooling method significantly influences the deterioration rate of rock strength but has no evident effect on the final static compressive strength of red sandstone. Under a 0.30 MPa impact pressure, as the number of impacts increases, the dynamic compressive strength of naturally cooled red sandstone first increases and then decreases. The first impact can enhance the compressive strength of naturally cooled red sandstone, but when the number of thermal cycles exceeds 15, the anti-impact resistance of red sandstone begins to decline. The dynamic damage constitutive model based on the Logistic distribution exhibits good consistency with the experimental curves, and the model parameters are easily obtainable with clear physical significance, demonstrating certain applicability. The research findings can provide a reference for rock mass construction, restoration, and surrounding rock stability analysis in variable-temperature environments.