Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Relationship of JRC Affecting the Safety Factor of Rock Slope

암반사면의 안전율에 영향을 미치는 JRC의 상관성에 대한 연구

  • Received : 2020.10.07
  • Accepted : 2021.07.21
  • Published : 2021.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

When drilling investigations for Rock Slopes are not possible, it is often difficult to calculate the Ground Design Constants required for the Limit Equilibrium Analysis. Therefore, the outcrops or partially cutted Rock Slopes were analysed using JRC and JCS that can be easily and conveniently measured. In particular, the effect of the JRC on the Safety Factor or the Rock Slopes was analyzed intensively, and the results were presented as a relationship formula and Table. When the Rock slope was stable, the JRC increased by an average of 9.0% as the slope height increased, and increased by an average of 29.8% as the slope angle increased. JRC was more sensitive to slope angle changes. The Cohesion corresponding to JRC was calculated from JRC-Fs formula. JRC and Cohesion showed a nonlinear relationship, and the Cohesion was about 8.0% more sensitive to slope height changes than slope angle changes.

암반사면은 시추조사가 불가한 경우가 많아 안정 해석에 필요한 지반정수를 산정하기 어려운 경우가 빈번하다. 본 연구에서는 노두나 부분적으로 절취된 사면에서 쉽고 간편하게 측정할 수 있는 거칠기계수(JRC) 및 강도(JCS)값을 이용하여 분석하였으며 특히, JRC값이 암반사면의 안전율에 미치는 영향을 집중 분석하여 그 결과를 상관식 및 도표로 제시하였다. 사면이 안정할 때 JRC값은 사면높이가 높아질수록 평균 9.0%씩 증가하였으며, 사면기울기가 높아질수록 평균 29.8%씩 증가하여 사면 기울기변화에 보다 민감한 것으로 나타났다. JRC-c의 상관식에서 JRC에 상응하는 점착력을 계산한 결과 JRC와 점착력은 비선형적인 관계를 보였으며, 점착력은 사면의 기울기 보다는 높이 변화에 약 8.0% 더 민감한 것으로 나타났다.

Keywords

Acknowledgement

본 논문은 2018년 8월 창원대학교 박사학위(정창근, 2018) 논문에서 발췌하였습니다.

References

  1. Kang, J. H., Lee, S. D., and Lee, J. I. (1994), "Shear Strength and Deformation Behavior of Rock Joint with Roughness", Korea Society for Rock Mechanics and Rock Engineering, Vol.4, No.3, pp.261-273.
  2. Kim, J. W., Lee, M. H., and Jang, K. T. (2007), "The Influence of Rock Joint Roughness and Normal Stress on Shear Behavior", Korea Society for Rock Mechanics and Rock Engineering, Vol.17, No.3, pp.186-196.
  3. Goo, Y. T. and Park, C. S. (2017), "Stability of Rock Slope by Limit Equilibrium Analysis", Changwon University, pp.15-32.
  4. Lee, I. M. and Lee, M. J. (1999), "Optimal Design of Rock Slope based on Reliability", Korea University, pp.75-83.
  5. Lee, G. S., Park, H. J., and Min, K. D. (2001), "Stability Analysis of Rock Slope Considering Discontinuous Surface Characteristics", The Korea Society of Economic and Environmental Geology, Vol.34, No.6, pp.601-615.
  6. Chung, H. S. and Ryu, B. O. (1996), "Failure Types in Rock Slopes According to Geological Characteristics", Korea Society for Rock Mechanics and Rock Engineering, Vol.12, No.6, pp. 37-49.
  7. Ha, J. C. and Park, C. S. (2015), "Investigations on the Failure Modes of Rock Slope in Gyeongsangnam-do", Korea Society for Rock Mechanics and Rock Engineering, Vol.28, No.6, pp.569-583.