An Experimental Study on Fracture Characteristic of Sandstone Subjected to Cyclic Wetting and Dryings

doi:10.11885/j.issn.1674-5086.2020.09.30.03

Abstract

Abstract: Periodic water-rock interaction has a great influence on the physical and mechanical properties of rock materials, which has been recognized as one of the important factors affecting the safety and stability of geotechnical engineering structures. In this study, we conducted a series of fracture tests with central cracked Brizilian disk specimens on a typical sandstone after undergiong wetting-drying cycles to investigate the influence of cyclic wetting-drying on the mixed mode I~II fracture resistance and crack propagation. Meanwhile, the degradation mechanism of cyclic wetting and drying was discussed by observing the changing characteristics of the microstructure of sandstone after undergoing cyclic wetting and drying. Finally, the experimental results were compared with the theoretical values based on the fracture criteria. The results show that the pure mode I, pure mode II and mixed mode fracture toughness of sandstone decrease with increasing number of wetting-drying cycles. The deterioration trend of fracture toughness is similar, but the degradation degree is slightly different. The degradation effect of wetting-drying cycles is more significant for a large loading angle or a mode II dominant loading condition. In addition, there is a good agreement between the experimental results and the theoretical values based on the generalized maximum tangential strain and generalized maximum tangential stress criteria, which takes into account the T-stress near the crack tip. Moreover, the criterion provide a better prediction for pure mode II when compared with the criterion.

Key words: sandstone, wetting-drying cycle, I~II mixed mode fracture, fracture toughness, central cracked Brazilian disk

CLC Number:

TU452

DONG Shiming, GAN Zhiqiang, HUA Wen. An Experimental Study on Fracture Characteristic of Sandstone Subjected to Cyclic Wetting and Dryings[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 12-21.

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