Effect of dry-wet cycles on mechanical and creep characteristics of sandstone under triaxial stress conditions

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0011

Abstract

Abstract:

In order to study the influence of dry-wet cycles on the mechanical and creep characteristics of sandstone under triaxial stress conditions, conventional triaxial compression tests and creep tests were carried out based on sandstone subjected to 0, 2, 4, 8, 16, and 32 dry-wet cycles. The results show that the compressive strength σ_c, elastic modulus E, and Poisson's ratio μ of sandstone are negatively correlated with the number of dry-wet cycles and positively correlated with the applied triaxial confining pressure. The brittleness index for quantitatively characterizing the brittleness of sandstone is negatively correlated with the number of dry-wet cycles. The creep failure form of sandstone is mainly shear failure. With the increase of dry-wet cycles, the final creep strain increases, and the average increase rate of creep between eight and 16 dry-wet cycles is the highest. Dry-wet cycles reshape the internal structure of sandstone. With the increase of cycles, the deformation and deterioration of sandstone under load are intensified. After eight dry-wet cycles, the stability of the sandstone structure is destroyed, and the short-term and long-term mechanical characteristics deteriorate greatly. The subsequent water-rock interactions gradually are weakened, and the deterioration trends gradually slow down.

Key words: triaxial confining pressure, dry-wet cycle, mechanical characteristic, creep characteristic, brittleness index, deterioration mechanism

CLC Number:

X936

GAN Yixiong, LIU Yingjie, SUN Zuo, CHENG Ye, YAN Bingqian, ZHANG Jingwen. Effect of dry-wet cycles on mechanical and creep characteristics of sandstone under triaxial stress conditions[J]. China Safety Science Journal, 2025, 35(S2): 154-160.

Figures/Tables 7

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