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Experimental Study on Tensile Characteristics of Layered Carbonaceous Slate Subject to Water–Rock Interaction and Weathering

Author

Listed:
  • Erqiang Li

    (School of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China)

  • Yanqing Wei

    (School of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China)

  • Zhanyang Chen

    (School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Paul Archbold

    (School of Engineering & Materials Research Institute, Technological University of the Shannon, N37 HD68 Westmeath, Ireland)

  • Brian Mullarney

    (School of Engineering & Materials Research Institute, Technological University of the Shannon, N37 HD68 Westmeath, Ireland)

Abstract

The transverse isotropy of rock masses formed by sedimentation is a common stratum environment in engineering, and the physical–mechanical properties can degrade due to water–rock interaction (WRI) and natural weathering, which potentially lead to the instability or collapse of tunneling, slopes and mining. Taking the carbonaceous slate of the Muzhailing tunnel as the research object, two types of specimens, which include oven-drying (instant drying in oven after fabrication) and natural air-drying (static weathering for 60 days after fabrication) were prepared, respectively, after which Brazilian tests were carried out and the tensile properties were analyzed under the two conditions. The experimental results showed that the two kinds of carbonaceous slate all show brittle failure, but the mechanical response such as failure displacement and peak load is obviously different. The tensile strength of the specimens is significantly all affected by the bedding, while the cleavage failure patterns of the two kinds are affected to different degrees. The softening coefficient of the natural air-drying specimen is 0.11–0.13, which implies that WRI and natural weathering play a vital role in the course of rock failure but have little influence on the transverse isotropy tensile property of bedding. Moreover, the mechanisms of specimen failure subject to WRI and 60 days’ weathering were explained by the SEM technique, which analyzed the micro-components and observes the process of specimen deterioration due to physicochemical reaction, the gradual development of cracks and erosion by weathering.

Suggested Citation

  • Erqiang Li & Yanqing Wei & Zhanyang Chen & Paul Archbold & Brian Mullarney, 2023. "Experimental Study on Tensile Characteristics of Layered Carbonaceous Slate Subject to Water–Rock Interaction and Weathering," Sustainability, MDPI, vol. 15(1), pages 1-17, January.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:1:p:885-:d:1024182
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    Cited by:

    1. Yungang Shi & Jingyu Wang & Xin Tan & Suhua Zhou & Yuxuan Jin & Xin Yin, 2023. "Stability Analysis of Strongly Weathered Muddy Slate Slopes Considering Softening Conditions of Water Immersion," Sustainability, MDPI, vol. 15(20), pages 1-13, October.

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