- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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| Citation: | ZHANG Junyun, ZHANG Le, GAO Fuzhou, TANG Yongji, HE Zhuoling, WANG Ying. Experimental Study on Strength and Deformation Characteristics of Red-Bed Soil-Rock Mixture Under Wetting-Drying Cycles[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1394-1404. doi: 10.3969/j.issn.0258-2724.20220343
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In order to study the deterioration law of the red-bed soil-rock mixture (RB-SRM) under wetting-drying cycles, the RB-SRM in Sichuan Basin was considered as the research object. The disintegration characteristics of red-bed soft rock blocks with different particle sizes were discussed through static disintegration tests. The original gradation scale of two groups of red-bed soil-rock mixed subgrade fillers was studied. The effects of wetting-drying cycle times on the cohesion, internal friction angle, dilation rate, and shear modulus of RB-SRM were studied by the laminated shear test. The results show that the red-bed soft rock block disintegrates significantly in water, and the disintegration process can be divided into the severe stage, transitional stage, and stable stage. The content of the disintegrated rock block in the severe stage is reduced by nearly 70%; for rock block with a larger particle size, it is more affected by the structural plane, and the disintegration is more significant. With the increase in the number of wetting-drying cycles, the shear strength is significantly reduced in the severe stage, while that in the transitional stage is basically unchanged and slightly recovered in the stable stage. After the disintegration of the rock block, the interlocking is significantly reduced; the apparent adhesion is sharply reduced, and the electrostatic attraction and the curing cementation slightly increase the cohesion. The friction and the redirection arrangement among the disintegrated RB-SRM slightly improve the internal friction angle. The maximum particle size and content of rock blocks are significantly reduced so that the RB-SRM is denser, and the dilation rate is significantly reduced under normal stress. Meanwhile, the skeleton-dense structure is transformed into a suspension-dense structure, and the shear modulus is significantly reduced. The degradation of cohesion and dilation rate under wetting-drying cycles is more obvious. The deterioration of the internal friction angle is mostly affected by the particle size of the blocks, and that of the shear modulus is least affected. Before embankment filling, it is suggested to disintegrate the RB-SRM twice to reduce the adverse effect of rainfall-evaporation cycles.
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