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암반 내 불연속면의 장기 전단 거동 평가를 위한 고찰

Case Studies on the Experiments for Long-Term Shear Behavior of Rock Discontinuities

김태현|최승범|권새하|민기복|임주휘
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)|2023.02|터널과 지하공간 (TUNNEL AND UNDERGROUND SPACE)|제33권 제1호|pp. 10-28

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참고문헌

키워드

고준위방사성폐기물CreepHigh-level radioactive waste크리프Shear testDeep geological disposal전단 시험심층처분Rate and state friction
주제분류자원공학

초록

고준위방사성폐기물 처분장의 장기 안정성을 확보하기 위해서 암반 불연속면의 장기적인 전단 거동을분석하고 그 안정성을 평가해야 한다. 암반 불연속면의 장기 전단 거동은 크리프 모델, RSF 모델로 모사될 수 있고, 전단 크리프 시험, 속도 단계 시험, 슬라이드-홀드-슬라이드 시험을 통해 모델에 필요한 파라미터를 결정하거나 여러 조건에서 전단 거동을 분석하는 실험을 수행할 수 있다. 기존 연구에 따르면 전단 실험을 위하여 직접전단시험기, 삼축압축시험기, 이축전단시험기가 주로 이용되었으며 현지 암반의열-수리-역학적인 조건을 재현하기 위해 다양하게 개선된 장비가 이용되었고 그에 따라 다양한 양상의전단 거동이 관찰되었다. 그러므로 국내 고준위방사성폐기물 처분장을 설계하기 위해서 처분장 부지의암종, 열-수리-역학적 조건, 광물의 변성, 그리고 전단 저항의 회복 등을 고려하여 암반 불연속면의 장기거동을 검토해야 한다.

Abstract

Long-term shear behavior of the rock discontinuities should be analyzed and its stability should be evaluated to ensure the long-term stability of a high-level radioactive waste disposal repo- sitory. The long-term shear behavior of the discontinuities can be modeled with creep and RSF models. The shear creep test, velocity step test, and slide-hold-slide test can be performed to determine their model parameters or analyze the shear behavior by experiments under various conditions. Testing apparatuses for direct shear, triaxial compression, and biaxial shear were mainly used and improved to reproduce the thermo-hydro-mechanical conditions of local bedrock, and it was confirmed that the shear behavior could vary. In order to design a high-level radioactive waste disposal site in Korea, the long-term behavior of rock discon- tinuities should be investigated in consideration of rock types, thermo-hydro-mechanical conditions, metamorphism, and restoration of shear resistance.

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