Trends in Predicting Groutability Based on Correlation Analysis between Hydrogeological and Rock Engineering Indices: A Review

Kwangmin Beck; Seonggan Jang; Seongwoo Jeong; Seungwoo Jason Chang; Minjune Yang

doi:10.9720/kseg.2023.2.307

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2023 Vol.33, Issue 2 Preview Page Next Page

Review

Trends in Predicting Groutability Based on Correlation Analysis between Hydrogeological and Rock Engineering Indices: A Review 수리지질 및 암반공학 지수 간 상관분석을 통한 절리암반 내 그라우트 주입성 예측 연구 동향: 리뷰논문

30 June 2023. pp. 307-322

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Abstract

Rock-mass grouting plays a crucial role in the construction of dams and deep caverns, effectively preventing seepage in the foundations, enhancing stability, and mitigating hazards. Most rock grouting is affected by hydrogeological and rock engineering indices such as rock quality designation (RQD), rock mass quality (Q-value), geological strength index (GSI), joint spacing (Js), joint aperture (Ap), lugeon value (Lu), secondary permeability index (SPI), and coefficient of permeability (K). Therefore, accurate geological analysis of basic rock properties and guidelines for grouting construction are essential for ensuring safe and effective grouting design and construction. Such analysis has been applied in dam construction sites, with a particular focus on the geological characteristics of bedrock and the development of prediction methods for grout take. In South Korea, many studies have focused on grout injection materials and construction management techniques. However, there is a notable lack of research on the analysis of hydrogeological and rock engineering information for rock masses, which are essential for the development of appropriate rock grouting plans. This paper reviews the current state of research into the correlation between the grout take with important hydrogeological and rock engineering indices. Based on these findings, future directions for the development of rock grouting research in South Korea are discussed.

Keywords

water pressure test

rock quality designation (RQD)

joint aperture (Ap)

lugeon value (Lu)

secondary permeability index (SPI)

grout take (GT)

대형 댐 및 대심도 지하공간 개발에서 많이 시행되는 암반 그라우팅은 기초지반의 누수를 방지하여 안정성을 향상시키고 추가적인 재해를 방지하기 위해 사용되는 중요한 공종 중 하나이다. 대부분의 암반 그라우팅은 수리지질 및 암반공학적 지수들(RQD, Q-value, GSI, Js, Ap, Lu, SPI, and K)에 의해 영향을 받는다. 따라서, 안전하고 적절한 그라우팅 설계 및 시공을 위해서는 지질학자들의 정확한 기초 암반의 분석과 적절한 그라우팅 계획 수립이 필요하다. 해외의 경우 기초 암반의 수리지질 및 암반공학적 특성 분석과 그라우트 주입량(grout take, GT) 예측에 대한 연구가 활발히 이루어지고 있으며, 주로 댐의 기초지반 분야에서 많은 연구가 수행되었다. 하지만, 국내의 경우 그라우트 주입재료 및 시공관리 기법에 대한 연구는 많이 수행되었으나 암반의 수리지질 및 암반공학적 특성을 고려한 암반 그라우팅 공법에 대한 연구는 미흡한 실정이다. 이에 본 리뷰에서는 암반 그라우팅 계획시 중요한 수리지질 및 암반공학적 지수들(RQD, Q-value, GSI, Js, Ap, Lu, SPI, and K)과 그라우트 주입량의 상관성 분석을 진행한 해외 연구 사례를 파악하고 국내의 암반 그라우팅 관련 연구의 발전방향을 제시하였다.

키워드

수압시험

암질지수

불연속면 틈새

루전

2차 투수지수

그라우트 주입량

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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 : 33
No :2
Pages :307-322
Received Date : 2023-06-24
Revised Date : 2023-06-29
Accepted Date : 2023-06-30
DOI :https://doi.org/10.9720/kseg.2023.2.307

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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