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In this paper, the digital image based triaxial shear test, computed tomography (CT) scanning test and scanning electron microscopy (SEM) test were employed to investigate triaxial shear behavior and microstructure evolution of basalt fiber reinforced loess subjected to drying−wetting cycles. The results show that the shear failure mode of soil samples with relatively higher basalt fiber content changes from overall bulging failure to shear band failure with the increase in the number of drying−wetting cycles, while the shear failure mode exhibits an opposite trend with the increase in the fiber content at the early stage of drying−wetting process. Neither drying−wetting cycle nor fiber content has obvious effect on the type and characteristics of stress−strain curves, and both of them present strain-hardening behavior. The deviatoric stress at failure decreases with the increasing number of drying−wetting cycles; however, the attenuation rate gradually decreases. The deviatoric stress at failure first increases and then decreases with the increasing fiber content, showing a parabolic variation, and the optimal fiber content is 0.6%. A similar trend is observed between the ME value of CT scanning and the deviatoric stress at failure. Drying−wetting action induces cracking and loosening around the soil-fiber interface, thus weakening the fiber reinforcement effect. However, compared with unreinforced loess, fiber reinforced loess demonstrates strong overall stability in its microstructure. The macroscopic and microscopic damage variables reflecting the drying−wetting induced deterioration of loess samples were finally established, which shows a consistent variation trend.
KIMURA R, TAKAYAMA N. Climate of the loess plateau: restoration and development of the degraded loess plateau, China[M]. Tokyo: Springer, 2014.
YUAN Zhi-hui, NI Wan-kui, TANG Chun, et al. Experimental study of structure strength and strength attenuation of loess under wetting-drying cycle[J]. Rock and Soil Mechanics, 2017, 38(7): 1894−1902.
HEJAZI S M, SHEIKHZADEH M, ABTAHI S M, et al. A simple review of soil reinforcement by using natural and synthetic fibers[J]. Construction and Building Materials, 2012, 30: 100−116.
GAO Lei, HU Guo-hui, CHEN Yong-hui, et al. Triaxial tests on clay reinforced by basalt fiber[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(Suppl. 1): 198−203.
CUI H Z, JIN Z Y, BAO X H, et al. Effect of carbon fiber and nanosilica on shear properties of silty soil and the mechanisms[J]. Construction and Building Materials, 2018, 189: 286−295.
SUJATHA E R, ATCHAYA P, DARSHAN S, et al. Mechanical properties of glass fibre reinforced soil and its application as subgrade reinforcement[J]. Road Materials and Pavement Design, 2021, 22(10): 2384−2395.
AN Ning, YAN Chang-gen, WANG Ya-chong, et al. Experimental study on anti-erosion performance of polypropylene fiber-reinforced loess[J]. Rock and Soil Mechanics, 2021, 42(2): 501−510.
LOPRESTO V, LEONE C, IORIO I D. Mechanical characterisation of basalt fiber reinforced plastic[J]. Composites Part B: Engineering, 2011, 42(4): 717−723.
CZIGANY T. Special manufacturing and characteristics of basalt fiber reinforced hybrid polypropylene composites: mechanical properties and acoustic emission study[J]. Composites Science & Technology, 2006, 66(16): 3210−3220.
LI Pei-da, LUO Ya-sheng, CHEN Qing-rui, et al. An experimental study of the California bearing ratio of basalt fiber reinforced loess[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 131−137.
TANG Chao-sheng, SHI Bin, GU Kai. Microstructural study on interfacial interactions between fiber reinforcement and soil[J]. Journal of Engineering Geology, 2011, 19(4): 610−614.
WANG De-yin, TANG Chao-sheng, LI Jian, et al. Shear strength characteristics of fiber-reinforced unsaturated cohesive soils[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 174−181.
LIU C, LÜ Y, YU X, et al. Effects of freeze-thaw cycles on the unconfined compressive strength of straw fiber-reinforced soil[J]. Geotextiles and Geomembranes, 2020, 48(4): 581−590.
XU J, LI Y, WANG S, et al. Shear strength and mesoscopic character of undisturbed loess with sodium sulfate after dry-wet cycling[J]. Bulletin of Engineering Geology and the Environment, 2020, 79(3): 1523−1541.
SHAO Long-tan, LIU Gang, GUO Xiao-xia. Effects of strain localization of triaxial samples in post-failure state[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(3): 385−394.
SHAO Long-tan, GUO Xiao-xia, LIU Gang, et al. Application of digital image processing technique to measuring specimen deformation in triaxial test[J]. Rock and Soil Mechanics, 2015, 36(Suppl. 1): 669−684.
YANG Geng-she, XIE Ding-yi, ZHANG Chang-qing. The quantitative analysis of distribution regulation of CT values of rock damage[J]. Chinese Journal of Rock Mechanics and Engineering, 1998, 17(3): 279−285.
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