응력장을 고려한 프리스플리팅 공법의 균열발생 원리에 대한 연구 = A Study on the Crack-propagation Mechanism of Pre-splitting Method with Consideration of Stress Field

다국어 초록 (Multilingual Abstract)

By investigating the stress redistribution caused by the preceding cut blasting when applying the pre-splitting method to tunnel round, an attempt was made to find conditions that were favorable for the propagation of cracks in contour holes. The investigation of the direction of minor principal stress in the numerical analysis revealed that the most significant factor affecting the change of the direction was the loading condition, while the core shape, rock type, and tunnel depth seemed to be less important in determining the direction of minor principal stress. Moreover, the number of cracks tended to increase with the increase of deviatoric stress. Through the model test of pre-splitting, it is confirmed that the pre-splitting method taking the stress field into account can reduce the extent of yield zone and has advantage in controlling the direction of crack than the conventional one.

참고문헌 (Reference)

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3 임수환, "응력장을 고려한 Pre-splitting공법 적용에 대한 연구" 인하대학교 2008

4 임수빈, "발파에 의한 터널굴착에 있어서 발파공 인접 암반의 동적 손상 평가" 경희대학교 1996

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7 "U.S Department of Transportation : Rock Blasting and Overbreak Control" National Highway Institute 1991

8 윤병식, "Pre-splitting 발파공법에 관한 기초적인 연구" 인하대학교 1999