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- Title
砂岩冻融劣化机理的多尺度试验研究.
- Authors
王生祖; 武康森; 达哇; 王冲
- Abstract
The freeze-thaw cycle caused by the alternations of cold and warm is one of the main reasons for the deterioration of rock materials in cold regions. In order to get the freeze-thaw deterioration mechanism of rock in cold regions, sandstone was selected as the research object to carry out freeze-thaw cycle tests with different cycles, and a series of macro, meso, and micro multi-scale tests were carried out. The results show that the P-wave velocity, the S-wave velocity, and the compressive strength of sandstone decrease with the freeze-thaw cycle number. The freeze-thaw cycle will coarsene the pore structure of sandstone. The more cycles, the more serious the pore coarsening phenomenon and the larger the porosity. The porosity and the pore size of sandstone will change from 2. 17% and 0. 000 28 ~ 13. 339 84 μm at 0 cycle to 5. 11% and 0. 004 55 ~ 43. 422 36 μm after 90 cycles. In addition, due to the increase in pore volume, the interconnectivity between pores leads to the decrease in the pore number as the freeze-thaw cycle number increases. It is precisely because of the deterioration of the pore structure by freeze-thaw cycles that sandstone samples show deterioration of wave velocity and mechanical properties on the macro scale, and the pore compaction stage strain and the peak strain increase with the cycle number. Based on the multi-scale test results, it is found that the deterioration rate of sandstone caused by freeze-thaw cycle increases with the cycle number. The research results can provide reference for engineering construction in cold regions.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 35, p15194
- ISSN
1671-1815
- Publication type
Article