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2025 Vol.35, Issue 2 Preview Page

Research Article

Development of Evaluation Indices for Dam-Foundation Grouting Based on Correlation Analysis between Discontinuity and Hydrogeological Parameters across Rock Types

암종별 불연속면 ‧ 수리지질 인자의 상관분석을 통한 댐 기초 그라우팅 평가 지표 제안

Kwangmin Beck12†
,
Hyerim Lee3†
,
Minjune Yang45*
백 광민12†
,
이 혜림3†
,
양 민준45*
1Ph.D. Student, Major of Earth and Environmental Sciences, Division of Earth and Environmental System Sciences, Pukyong National University
2Chief Engineer, Department of Water Resources, Korea Engineering Consultants Corp.
3Master Student, Major of Earth and Environmental Sciences, Division of Earth and Environmental System Sciences, Pukyong National University
4Associate Professor, Major of Environmental Geosciences, Division of Earth and Environmental System Sciences, Pukyong National University
5President, Wible Co., Ltd.
1부경대학교 지구환경시스템과학부 지구환경과학전공 박사과정생
2(주)한국종합기술 수자원부 상무보
3부경대학교 지구환경시스템과학부 지구환경과학전공 석사과정생
4부경대학교 지구환경시스템과학부 환경지질과학전공 부교수
5(주)와이블 대표이사
*Corresponding Author
†These authors equally contributed to this study
30 June 2025. pp. 265-282
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Abstract

To successfully perform rock grouting and ensure the safety of a dam, it is important to choose appropriate evaluation factors and select grout that is suitable for the local geological environment. We used data from rock types at five dam sites (A-E) to analyze the correlation between discontinuity characteristics [rock quality designation (RQD) and joint spacing (Js)] and hydrogeological factors [Lugeon value (Lu) and secondary permeability index (SPI)], which are key evaluation factors for rock grouting. Sites A and D, which are composed of granitic gneiss and granitic porphyry that is >60% fair-poor quality, showed decreasing correlation from RQD versus Lu (Site A: r = -0.86; Site D: r = -0.65) to RQD versus SPI (Site A: r = -0.80; Site D: r = -0.64), Js versus Lu (Site A: r = -0.59; Site D: r = -0.38), and finally Js versus SPI (Site A: r = -0.54; Site D: r = -0.36). Sites B and C, which consist of >70% good quality mica schist and hornfels, also showed decreasing correlation from RQD versus Lu (Site B: r = -0.89; Site C: r = -0.74) to RQD versus SPI (Site B: r = -0.81; Site C: r = -0.66), Js versus Lu (Site B: r = -0.48; Site C: r = -0.34), and finally Js versus SPI (Site B: r = -0.50; Site C: r = -0.30). Site E (granite), which contains >70% moderate-good quality rock, showed decreasing correlation from RQD versus Lu (r = -0.70) to RQD versus SPI (r = -0.67), Js versus Lu (r = -0.50), and finally Js versus SPI (r = -0.44), although caution is required in interpreting these results due to the limited data. Based our results, RQD and SPI are key factors for classifying the rock quality of dam foundations and planning grouting works, and are closely correlated. The evaluation indicators (RQD and SPI) and the hydrogeological approach presented here are applicable in practice, and the correlation of each factor may serve as useful basic data for future research.

Keywords
water pressure test
rock quality designation (RQD)
joint spacing (Js)
Lugeon value (Lu)
secondary permeability index (SPI)

댐 구조물의 안전성 확보를 위해 시행되는 암반그라우팅의 성공적인 수행을 위해서는 국내 지질환경에 적합한 평가 인자의 합리적인 선정 및 계획 수립이 중요하다. 본 연구에서는 국내 5개 댐 부지(A-E)에 분포하는 암종을 대상으로, 암반그라우팅과 밀접한 관련이 있는 불연속면 특성 인자(RQD, Js)와 수리지질학적 인자(Lu, SPI) 간의 상관관계를 분석하였다. 보통-불량한 암질이 60% 이상 분포하는 A 부지(화강암질 편마암)와 D 부지(화강반암)에서는 RQD-Lu(A 부지: r = -0.86; D 부지: r = -0.65), RQD-SPI(A 부지: r = -0.80; D 부지: r = -0.64), Js-Lu(A 부지: r = -0.59; D 부지: r = -0.38), Js-SPI(A 부지: r = -0.54; D 부지: r = -0.36) 순으로 상관성이 감소하였다. 양호한 암질이 70% 이상 분포하는 B 부지(운모 편암)와 C 부지(혼펠스) 역시 RQD-Lu(B 부지: r = -0.89; C 부지: r = -0.74), RQD-SPI(B 부지: r = -0.81; C 부지: r = -0.66), Js-Lu(B 부지: r = -0.48; C 부지: r = -0.34), Js-SPI(B 부지: r = -0.50; C 부지: r = -0.30) 순으로 상관성이 감소하는 경향을 보였다. 보통-양호한 암질이 70% 이상 분포하는 E 부지(화강암)에서는 RQD-Lu(r = -0.70), RQD-SPI(r = -0.67), Js-Lu(r = -0.50), Js-SPI(r = -0.44)순으로 음의 상관성이 나타났으며, 자료 수의 제한으로 해석에 주의가 필요하다. 이러한 분석 결과를 바탕으로, RQD와 SPI는 댐 기초 지반의 암질을 정량적으로 평가하고 그라우팅 계획을 수립하는 데 유의한 상관성을 나타내는 핵심 인자로 확인되었다. 본 연구에서 제시한 평가 인자(RQD, SPI) 및 수리지질학적 접근법은 향후 암반그라우팅 실무 적용에 있어 유용하게 활용될 수 있으며, 도출된 인자 간 상관성 분석 결과는 후속 연구를 위한 유용한 기초 자료로 활용될 수 있을 것으로 기대된다.

키워드
수압시험
암질지수
불연속면 간격
루전
2차 투수지수
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 35
  • No :2
  • Pages :265-282
  • Received Date : 2025-06-09
  • Revised Date : 2025-06-24
  • Accepted Date : 2025-06-25
  • DOI :https://doi.org/10.9720/kseg.2025.2.265
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