Investigation on the damage model of rock subjected to freeze-thaw cycles considering its fracture voids compaction

• Published in: Cold regions science and technology Vol. 223; p. 104222
• Main Authors: Shi, Sheng, Zhu, Fengjin, Hu, Hongqiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2024
• Subjects: Constitutive model; Fracture voids compaction deformation; Freeze-thaw cycles; Rock mechanics; Statistical damage; Constitutive model; Rock mechanics; Statistical damage; Fracture voids compaction deformation; Freeze-thaw cycles
• ISSN: 0165-232X; 1872-7441
• DOI: 10.1016/j.coldregions.2024.104222

The investigation on the mechanical properties and damage model of rock subjected to freeze-thaw cycles (FTCs) holds significant theoretical for assessing the deformation of rock mass engineering in cold regions. When the rocks subjected to FTCs, the fracture voids of rocks increase with increasing number of FTCs, and the rocks exhibit nonlinear deformation characteristics as its fracture voids compaction. Based on the dissipation energy evolution law and distribution characteristics of rocks under loading, the critical point of rock compaction deformation was determined. A constitutive model for rock subjected to FTCs considering its fracture voids compaction was established based on macroscopic and microscopic damage levels. The rationality of the model was validated using experimental results, and a comparison was made between the calculation results of proposed model and model that not consider fracture voids compaction. The evolution properties of rock damage variable and stress under different FTCs were analyzed. The variation of model parameters with the FTCs and the influence of model parameters on the deformation characteristics of rock was analyzed. •The influences of FTCs on the properties of rocks under different stress conditions were analyzed.•A method for determining the critical point of rock compaction deformation was proposed.•A model of rock subjected to FTCs considering its fracture voids compaction was established.•The variations of model parameters with the FTCs on the deformation of rock were analyzed.