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2026 Vol.36, Issue 1 Preview Page

Original Article

Experimental Study on the Thermal Effect on the Shear-Flow Behaviors of Hamyeol Granite Joints

열적 효과가 함열 화강암 절리의 전단-수리 거동에 미치는 영향에 관한 실험적 연구

Seong Jun Ha1*
,
Taehyun Kim1
,
Jin-Seop Kim2
하 성준1*
,
김 태현1
,
김 진섭2
1Senior Researcher, Korea Atomic Energy Research Institute
2Principal Researcher, Korea Atomic Energy Research Institute
1한국원자력연구원 선임연구원
2한국원자력연구원 책임연구원
*Corresponding Author
28 February 2026. pp. 83-102
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Abstract

Deep rock masses are complex structures characterized by numerous joints. These discontinuities serve as mechanical weaknesses and primary pathways for groundwater flow, making it essential to characterize their coupled thermo-hydro-mechanical behavior. In this study, shear-flow coupled tests were conducted on granite joints at both ambient and elevated temperatures to investigate the influence of thermal effects on shear-flow behavior. The experimental procedure was categorized into three distinct stages: pre-shear, during-shear, and residual. During each stage, permeability characteristics were precisely measured in response to changes in joint normal stress and injection pressure. In the pre-shear stage, permeability decreased due to the thermal closure effect caused by thermal expansion and increased normal stress. However, during shear failure, the flow rate surged by more than 100 times compared to the initial state, as the effect of shear dilation significantly overwhelmed thermal expansion. In the residual stage, shear dilation remained the dominant factor, leading to convergent flow behaviors regardless of the temperature conditions.

Keywords
Granite joint
Shear-flow behavior
Thermal effect
Permeability
Shear strength

심부 암반은 다수의 절리를 포함하는 복합 구조체로, 이러한 불연속면은 역학적 취약부이자 지하수 유동의 주요 경로로 작용하므로 열-수리-역학적 복합 거동 규명이 필수적이다. 특히 전단 하중과 온도 변화가 결합될 경우, 암석 매질의 열팽창과 전단 팽창이 수리적 특성에 미치는 영향은 매우 복잡한 양상을 띤다. 본 연구에서는 화강암 절리의 전단-수리 거동에 열적 효과가 미치는 영향을 조사하기 위해 상온 및 고온 조건에서 전단-수리 복합 실험을 수행하였다. 실험 과정은 전단 전, 전단 중, 잔류의 세 단계로 구분되었으며, 각 단계에서 절리에 대한 수직 응력 및 주입압 변화에 따른 투수 특성을 정밀하게 계측하였다. 연구 결과, 전단 전 단계에서는 수직 응력 증가와 열팽창에 의한 열적 닫힘 효과로 투수성이 감소하였으나, 전단 파괴 시 발생하는 전단 팽창이 이를 압도하여 유량이 초기 대비 100배 이상 급증하였다. 특히 잔류 단계에서는 전단 팽창 효과가 지배적으로 작용하여 온도 조건에 관계없이 수리적 거동이 유사해지는 양상을 보였다.

키워드
화강암 절리
전단-수리 거동
열적 효과
투수 계수
전단 강도
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 36
  • No :1
  • Pages :83-102
  • Received Date : 2026-02-13
  • Revised Date : 2026-02-20
  • Accepted Date : 2026-02-24
  • DOI :https://doi.org/10.7474/TUS.2026.36.1.083
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