한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제20권4호
  • /
  • Pages.89-102
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  • 2004
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
권호 표지

터널발파로 인한 굴착선주변 암반거동의 확률론적 연구

Probabilistic Analysis of Blasting Loads and Blast-Induced Rock Mass Responses in Tunnel Excavation

  • 이인모 (고려대학교 사회환경시스템공학부) ;
  • 박봉기 (고려대학교 사회환경시스템공학부) ;
  • 박채우 (동일기술공사, 지반사업부)
  • 발행 : 2004.06.01
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초록

디커플링장전조건의 화약 폭발시 발생하는 발파압력은 최대압력, 최대압력 도달시간, 압력파형의 함수로 나타난다. 발파 최대압력과 최대압력 도달시간은 화약과 암반 특성의 함수이다. 화약과 암반특성시험 결과로부터 그 특성치의 확률분포를 산출하였다. 화약과 암반 특성치의 확률분포가 정규분포로 나타났으므로 발파 최대압력과 최대압력 도달시간의 확률분포도 정규분포로 추정되었다. 발파 최대압력과 최대압력 도달시간에 가장 크게 영향을 미치는 변수를 파악하기 위하여 매개변수분석과 불확정성분석을 실행하였다. 최대압력과 최대압력 도달시간은 매개변수분석결과 화약특성에 가장 크게 영향을 받았지만 불확정성분석결과 화약보다 암반특성에 크게 영향을 받았다. 발파로 인하여 굴착선주 변 암반에 발생하는 손상을 수치해석으로 분석하였다. 암반손상을 산정하기 위하여 연속체손상역학에 기초하여 사용자 부 프로그램을 작성하였다. 이 부 프로그램을 ABAQUS 주 프로그램과 연결하여 해석하였다. 동적 해석결과는 확대공 발파에 의한 손상이 외곽공보다 크게 나타났다. 확대공 배치, 암반분류 세분화 등 여굴방지 방안이 제안되었다 손상계수의 파쇄기준이 불명확하므로 fuzzy-random 확률이론을 적용하여 파쇄기준과 파쇄영역을 명확하게 나타내었다.

The generated blasting pressure wave initiated under decoupled-charge condition is a function of peak blasting pressure, rise time, and wave-shape function. The peak blasting pressure and the rise time are also the function of explosive and rock properties. The probabilistic distributions of explosive and rock properties are derived from the results of their property tests. Since the probabilistic distributions of explosive and rock properties displayed a normal distribution, the peak blasting pressure and the rise time can also be regarded as a normal distribution. Parameter analysis and uncertainty analysis were performed to identify the most influential parameter that affects the peak blasting pressure and the rise time. Even though the explosive properties were found to be the most influential parameters on the peak blasting pressure and the rise time from the parameter analyses, the result of uncertainty analysis showed that rock properties constituted major uncertainties in estimating the peak blasting pressure and the rise time rather than explosive properties. Damage and overbreak of the remaining rock around the excavation line induced by blasting were evaluated by dynamic numerical analysis. A user-subroutine to estimate the rock damage was coded based on the continuum damage mechanics. This subroutine was linked to a commercial program called 'ABAQUS/Explicit'. The results of dynamic numerical analysis showed that the rock damages generated by the initiation of stopping hole were larger than those from the initiation of contour hole. Several methods to minimize those damages were proposed such as relocation of stopping hole, detailed subdivision of rock classification, and so on. It was found that fracture probability criteria and fractured zones could be distinctively identified by applying fuzzy-random probability.

키워드

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