Abstract
Freeze-thaw erosion is the main reason for rock mass instability in cold regions and poses major threats to public safety. In this study, the stress threshold, energy, and strain field evolution of sandstone and the variation in stress intensity factor of fractures in various stress fields were all investigated after freeze-thaw cycles by uniaxial compression tests and digital image correlation technology. The results show that the elastic modulus, crack initiation stress, and peak stress all fell by 97%, 92.5%, and 89.9%, respectively, as the number of freeze-thaw cycles approaches 80. Elastic energy’s storage capacity also dropped from 0.85 to 0.17. Sandstone’s strain was increased by freeze-thaw erosion, which also improved ductility and shortened the cracking time. The stress intensity factor at the crack tip was positively correlated with the tip inclination angle and negatively correlated with the number of freeze-thaw cycles. This study provides a useful reference for understanding the stability of rock masses and the characteristics of crack derivation in cold regions.
Funder
National Natural Science Foundation of China
Scientific Research Fund of Liaoning Provincial Education Department
Publisher
Public Library of Science (PLoS)
Reference38 articles.
1. Frost Crack Propagation and Interaction in Fissured Rocks Subjected to Freeze–thaw Cycles: Experimental and Numerical Studies;L Sun;Rock Mechanics and Rock Engineering,2022
2. Study on theory model of hydro-thermal–mechanical interaction process in saturated freezing silty soil;Y Lai;International Journal of Heat and Mass Transfer,2014
3. Analysis of the effect of freeze–thaw cycles on the degradation of mechanical parameters and slope stability;J Li;Bulletin of Engineering Geology and the Environment,2018
4. Experimental Study on Mechanical Properties of Freeze-Thaw Damaged Red Sandstone under Combined Dynamic and Static Loading;S Mei;Shock and Vibration,2021
5. Damage characteristics and energy-dissipation mechanism of frozen–thawed sandstone subjected to loading;F Gao;Cold Regions Science and Technology,2020