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초록

암반구조물의 파괴는 초기응력의 크기, 무결암의 강도 그리고 단층이나 절리와 같이 암반 내에 존재하는 불연속면의 상태에 의해 좌우된다. 일반적으로 고심도에 건설되는 암반구조물의 경우 높은 현지응력과 공동굴착에 따른 유도응력으로 인해 공동 경계면에서 스폴링이나 슬래빙과 같은 취성파괴가 발생할 수 있다. 최근 고심도에 건설되는 암반구조물이 증가함에 따라 취성파괴의 발생사례가 증가하고 있으며, 더욱이 국내의 저심도 구간에서도 스폴링 현상이 보고되어 취성파괴에 대한 연구의 필요성이 요구된다. 그러나 아직까지 취성파괴에 대해 명확하게 규명되지 않아 본 보고에서 취성파괴 현상을 규명하기 위해 수행되었던 기존 연구결과를 중심으로 취성파괴와 그 특징에 대하여 요약 정리하였다.

Abstract

Failure around an underground opening is a function of in-situ stress magnitudes, intact rock strength and the distribution of fractures in the rock mass. At high in-situ stress, the failure process is affected and eventually dominated by stress-induced fractures preferentially growing parallel to the excavation boundary. This fracturing is often observed in brittle type of failure such as slabbing or spatting. Recent studies dies on the stress-induced damage of rock revealed its importance especially in a highly stressed regime. As the constructions of underground structures at deep depths increased, the cases of the brittle failure also increased and furthermore spalling was occurred in Korea at low depths. To improve the stability of the underground structures at highly stressed regime, the characteristics of brittle failure should be examined, but they have not yet been properly investigated. Therefore in this report the characteristics of brittle failure such as types, failure mechanism and modeling methods etc. were considered in all aspects, based on the previous researches.

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이 논문을 인용한 문헌 (3)

  1. Cheon, Dae-Sung ; Park, Chan ; Park, Chul-Whan ; Jeon, Seok-Won 2007. "True Triaxial Physical Model Experiment on Brittle Failure Grade and Failure Initiation Stress" 터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, 17(2): 128~138 
  2. Cheon, Dae-Sung ; Park, Chul-Whan ; Jeon, Seok-Won ; Park, Chan 2007. "The extent and depth of brittle failure around circular tunnel with stress conditions" 터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, 17(4): 311~321 
  3. Park, Jung-Ah ; Park, Bona ; Min, Ki-Bok 2014. "Comparisons of Brittleness Indices of Shale and Correlation Analysis for the Application of Hydraulic Fracturing" 터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, 24(4): 325~333 

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