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Research Article

Review of Applicability of Analysis Method based on Case Study on Rainfall-Induced Rock Slope Failure

강우에 의한 암반사면 파괴 해석 사례 연구를 통한 해석방법 적용성 검토

Jahe Jung1
,
Woo-Seok Kim1*
정 자혜1
,
김 우석1*
1Korea Institute of Civil Engineering and Building Technology
1한국건설기술연구원
* 교신저자* Corresponding Author
September 2017. pp. 267-274
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Abstract

Behavior of rock mass depend on the mechanical properties of intact rock and geometrical property of discontinuity distributed in rock mass. In case of rock slope, particularly, location of slope failure surface and behavior after failure are changed due to dis­continuities. In this study, two 3D slope stability analysis methods were developed for two different failure types which are cir­cular failure and planar failure, considering that failure type of rock slope is dependent on scale of discontinuity which was then applied to real rock slope to review the applicability. In case of circular failure, stable condition was maintained in natural dry condition, which however became unstable when the moisture content of the surface was increased by rainfall. In case of planar failure, rock slope become more unstable comparing to dry condition which is attributable to decrease in friction angle of dis­continuity surface due to rainfall. Viewing analysis result above, analysis method proved to have well incorporated the phenom­enon occurred on real slope from the analysis result, demonstrating its applicability to reviewing the slope stability as well as to maintaining the slope.

Keywords
Rock slope
3D slope stability analysis
Discontinuous rock mass

암반은 암석재료 자체의 역학적 성질과 암반 내에 분포하는 불연속면의 기하학적 특징에 의해 그 역학적 특성이 좌우된다. 암반사면의 경우에는 불연속면에 의해 특히 파괴면의 위치와 파괴후의 거동 등이 달라진다. 본 논문에서는 불연속면의 규모에 따라 암반사면의 파괴형태가 달라지는 점을 고려하여, 원호파괴와 평면파괴 안정해석을 위한 2개의 3D 해석방법을 개발하고 실제 사면에 적용하여 그 적용성을 검토하였다. 결과, 원호파괴의 경우, 자연건조상태에서는 안정하지만 강우에 의해 표층 함수비가 증가하면 불안정해지는 해석 결과를 얻었다. 평면파괴의 경우도 강우에 의해 불연속면 자체의 마찰각이 감소하는 영향에 의해 건조상태보다 불안정해지는 결과가 나타났다. 이상의 해석 결과로부터 실제 사면에서의 현상을 잘 반영하는 것으로 보아, 개발된 해석방법이 사면안정성 검토 또는 유지관리의 목적으로 적용가능하다고 판단된다.

키워드
암반사면
3차원 사면안정해석
불연속성 암반
References
1
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 27
  • No :3
  • Pages :267-274
  • Received Date : 2017-08-11
  • Revised Date : 2017-09-11
  • Accepted Date : 2017-09-13
  • DOI :https://doi.org/10.9720/kseg.2017.3.267
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