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- Title
Influence of humidity on mechanical properties of fractured sandstone under the triaxial compression.
- Authors
Zhou, Yu; Wan, Wen; He, Huan; Chen, Wei; Zhao, Yanlin; Wu, Qiuhong; Xie, Senlin
- Abstract
This study aims to investigate the influence of the deep high humidity environment on the mechanical characteristics of fractured pillars. In this test, the fractured sandstone was taken from the Mofang mining area of the Wengfu Phosphate Mine, and a self-made high-humidity environment simulation device was employed. During the whole test, the specimens were placed in a high-humidity environment at four humidity levels (70%RH, 80%RH, 90%RH, and 100%RH) for 60 days; the mineral composition, pore size, microstructure, and mechanical properties of rock specimens at key time nodes were analyzed through the X-ray diffraction, scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), and triaxial compression test. The results show the following: (1) with the increase of the humidity, the total area of T2 spectra of the sandstone NMR increases continuously and the relaxation time corresponding to the peak gradually shifts to the right, indicating that the pore size of the specimen increases under the high-humidity environment. Besides, with the increase of time, the spectral area increases gradually with the increase of water content, but the increasing rate of the spectral area tends to be flat at about 40 days. (2) Taking the specimen at the confining pressure of 20 MPa as an example, compared with those at the humidity level of 70%RH, the triaxial peak deviation stress, residual deviation strength, and initial deviation stress of the specimen at the humidity level of 100%RH decrease by 28.71%, 26.22%, and 28.71%; the cohesion c and internal friction angle φ decrease by 26.82% and 13.82%. (3) The mechanical properties and microstructure damage of sandstone in the high-humidity environment are time dependent, and damage parameters tend to be stable after a certain time. This study provides a theoretical basis for the long-term stability assessment of the ore pillars under the high-humidity environment in deep mining.
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 11, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-10148-9