Geomechanics and Engineering

  • 제33권1호
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  • Pages.53-63
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  • 2023
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

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Stability analysis of infinite rock slopes with varying disturbances based on the Hoek-Brown failure criterion

  • Dowon Park (Department of Civil Engineering, University of Seoul)
  • 투고 : 2022.11.25
  • 심사 : 2023.03.07
  • 발행 : 2023.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Rock disturbance caused by blasting and stress relaxation is commonly observed during excavation. As the distance from the source of disturbance increases, the degree of disturbance decreases, and rock at a large depth does not experience disturbance. However, in stability analyses, a single value of disturbance is often applied to the entire rock mass, which leads to underestimated results. In this study, this modeling mistake is addressed by considering realistically varying rock disturbance. The safety of infinite slopes in a disturbed rock mass with a strength governed by the Hoek-Brown failure criterion is investigated based on the kinematic approach of limit analysis. The maximum disturbance is assigned to the outermost slope face because it is directly exposed to blasting damage and dilation, and the disturbance progressively decays with distance in the rock mass. The safety analysis results indicate that the assumption of uniform disturbance in the entire rock mass leads to underestimation of the rock strength and safety on infinite rock slopes. A critical slip surface appears to be within the disturbed rock layer as well as the interface between the disturbed upper rock and undisturbed lower rock.

키워드

과제정보

This work was supported by the 2021 Research Fund of the University of Seoul.

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