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| Deformation and damage characteristics of sandstone under the combined action of stress and freeze-thaw cycles |
| ZHU Tantan1，LI Ang1，HUANG Da2，3，ZONG Xilei1，MA Fuwang1
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| (1. School of Highway，Chang?an University，Xi?an，Shaanxi 710064，China；2. College of Geological Engineering and Geomatics，Chang?an University，Xi?an，Shaanxi 710064，Xi?an，Shaanxi 710064，China；3. School of Civil and Transportation
Engineering，Hebei University of Technology，Tianjin 300401，China)
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Abstract Engineering rock mass in cold regions is subjected to the combined effect of stress and freeze-thaw cycle. Under the long-term coupling action of stress and freeze-thaw，the mechanical properties of rock will be significantly weakened，which may result in engineering rock mass disasters. To investigate the deformation and damage characteristics in macro and micro view of sandstone under stress and freeze-thaw coupling，the freeze-thaw cycle test was carried out firstly on sandstone samples. The change in frost heaving deformation of sandstone during freeze-thaw cycle without stress was studied. Then，a numerical method for rock freeze-thaw cycle simulation based on particle flow and particle expansion was proposed. The method was used to carry out numerical simulations of rock freeze-thaw cycle under axial stress. The evolution of deformation and fracture in the process of freeze-thaw under axial stress is studied. Results show that without the action of axial stress，the axial and radial strains of sandstone first increase and then remain unchanged as the number of freeze-thaw cycles increases. There is a significant difference between axial strain and radial strain of sandstone samples during freeze-thaw cycle. The radial strain of sandstone samples is greater than the axial strain. The difference between axial strain and radial strain of sandstone samples first increases and then decreases with the increase of the number of freeze-thaw cycles. When the axial stress is greater than zero，the axial strain decreases with the increase of the number of freeze-thaw cycles，and the radial strain increases with the increase of the number of freeze-thaw cycles. Under the action of frost heaving force，the crack density near the sample surface is greater than that inside the sample. During the freeze-thaw cycle，the axial stress will inhibit the crack initiation and propagation along the direction with a large angle with the specimen axis. During the freeze-thaw cycle，the cracks formed inside the sample are mainly tensile crack. The numerical simulation method based on particle flow and particle expansion can better simulate the freeze-thaw deformation and fracture evolution of sandstone in the process of freeze-thaw cycle.
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2023, Vol. 42 
