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2025 Vol.27, Issue 6 Preview Page

Research Paper

A study on the impact of excavation damaged zone (EDZ) on groundwater inflow and optimization of grouting design

굴착손상영역(EDZ)이 지하수 유입에 미치는 영향과 그라우팅 최적화 연구

Lymeng Ny1
,
Jin-Sung Kim2
,
Hyoung-Seok Oh3
,
Joon-Shik Moon4*
,
Ho-Seok Lee5
니 리멩1
,
김 진성2
,
오 형석3
,
문 준식4*
,
이 호석5
1Master Student, Dept. of Civil Engineering, Kyungpook National University
2Ph.D. Student, Dept. of Civil Engineering, Kyungpook National University
3Ph.D. Candidate, Dept. of Civil Engineering, Kyungpook National University
4Professor, Dept. of Civil Engineering, Kyungpook National University
5CEO, Vision Tech
1비회원, 경북대학교 토목공학과 석사과정
2학생회원, 경북대학교 토목공학과 박사과정
3정회원, 경북대학교 토목공학과 박사수료
4정회원, 경북대학교 토목공학과 교수
5비회원, 비젼테크 대표이사
*Corresponding Author
30 November 2025. pp. 605-622
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Abstract

This study aims to quantitatively investigate the impact of the excavation damaged zone (EDZ), formed during tunnel excavation, on groundwater inflow, and to propose an optimized grouting design strategy for effective mitigation. Targeting rock mass classes IV and V, this study analyzes the influence of EDZ characteristics, hydraulic property changes, and variations in grouting permeability and thickness by applying analytical equations and PLAXIS 2D-based numerical simulations. The results show that the presence of the EDZ significantly increases groundwater inflow paths, becoming a major factor in tunnel instability. Reducing the permeability of the grouting material and ensuring sufficient grouting thickness were found to be critical in lowering inflow rates. In particular, when the grouting permeability ratio was 1/100 and the thickness exceeded 1.5–2.0 m, more than 95% sealing efficiency was achieved, and the analytical and numerical results showed close agreement. Therefore, this study offers a quantitative grouting design methodology that considers both cost-effectiveness and technical reliability for future tunnel engineering applications.

Keywords
Excavation damaged zone (EDZ)
Grouting
Groundwater inflow
Hydraulic conductivity
Waterproof design

본 연구는 터널 굴착 시 형성되는 굴착손상영역(excavation damaged zone, EDZ)이 지하수 유입에 미치는 영향을 정량적으로 규명하고, 이에 효과적으로 대응할 수 있는 최적의 그라우팅 설계 방안을 제시하는 것을 목적으로 한다. 암반등급 IV 및 V를 대상으로 EDZ의 특성과 수리적 변화, 그리고 그라우팅의 투수계수 및 두께 변화가 지하수 유입량에 미치는 영향을 PLAXIS 2D 기반 수치해석과 해석식을 통해 비교·분석하였다. 그 결과, EDZ의 존재는 지하수 유입 경로를 확대하여 터널 안정성 저하의 주요 원인이 되며, 그라우팅의 투수성 저감과 충분한 두께 적용은 유입량 감소에 결정적인 영향을 미친다. 특히 그라우팅 투수계수비가 1/100, 두께가 1.5–2.0 m 이상일 경우 95% 이상의 차수 효율이 확인되었으며, 해석식과 수치해석 결과가 유사하게 나타났다. 따라서 본 연구는 향후 터널 설계에 있어서 경제성과 기술적 신뢰성을 고려한 정량적 차수 설계 기법을 제공할 수 있다.

키워드
굴착손상영역(EDZ)
그라우팅
지하수 유입
투수계수
차수 설계
References
1

Bäckblom, G. (2008), Excavation damage and disturbance in crystalline rock - Results from experiments and analyses, Technical Report TR-08-08, Swedish Nuclear Fuel and Waste Management Co., pp. 16-17.

2

Carranza-Torres, C., Fairhurst, C. (1999), “The elasto-plastic response of underground excavations in rock masses that satisfy the Hoek-Brown failure criterion”, International Journal of Rock Mechanics and Mining Sciences, Vol. 36, No. 6, pp. 777-809.

10.1016/S0148-9062(99)00047-9
3

Chen, Y.F., He, J.G., Lei, W.J., Hu, R., Yang, Z. (2024), “Optimization design of consolidation grouting around high-pressure tunnel considering non-Darcian flow effect”, Rock Mechanics and Rock Engineering, Vol. 57, No. 9, pp. 7407-7424.

10.1007/s00603-024-03906-6
4

El Tani, M. (2003), “Circular tunnel in a semi-infinite aquifer”, Tunnelling and Underground Space Technology, Vol. 18, No. 1, pp. 49-55.

10.1016/S0886-7798(02)00102-5
5

Garshol, K.F., Tam, K.W.J., Mui, W.B.S., Chau, K.M.H., Lau, C.K.K. (2012), “Grouting techniques for deep subsea sewage tunnels in Hong Kong”, Proceedings of the World Tunnel Congress 2012, Bangkok.

10.1201/b14769-292
6

Goodman, R.E., Moye, D.G., Van Schalkwyk, A., Javandel, I. (1964), Ground Water Inflows During Tunnel Driving, College of Engineering, University of California.

7

Karlsrud, K. (2002) “Control of water leakage when tunnelling under urban areas in the Oslo region”, In Water Control in Norwegian Tunnelling (Publication No. 12), Norwegian Tunnelling Society (NFF), Oslo, pp. 27-33.

8

Kelsall, P.C., Case, J.B., Chabannes, C.R. (1984), “Evaluation of excavation-induced changes in rock permeability”, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 21, No. 3, pp. 123-135.

10.1016/0148-9062(84)91530-4
9

Mao, D., Lu, M., Zhao, Z., Ng, M. (2016), “Effects of water related factors on pre-grouting in hard rock tunnelling”, Procedia Engineering, Vol. 165, pp. 300-307.

10.1016/j.proeng.2016.11.704
10

Martino, J.B., Chandler, N.A. (2004), “Excavation-induced damage studies at the underground research laboratory”, International Journal of Rock Mechanics and Mining Sciences, Vol. 41, No. 8, pp. 1413-1426.

10.1016/j.ijrmms.2004.09.010
11

Matsui, H., Sugihara, K., Sato, T. (2003), “In-situ experiments on excavation disturbance in JNC’s Geoscientific Research Programme: Impact of the excavation disturbed or damaged zone (EDZ) on the performance of radioactive waste geological repositories”, Proceedings of the European Commission CLUSTER Conference and Workshop on EDZ in Radioactive Waste Geological Repositories, ENRESA, Luxembourg.

12

Pusch, R., Stanfors, R. (1992), “The zone of disturbance around blasted tunnels at depth”, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 29, No. 5, pp. 447-456.

10.1016/0148-9062(92)92629-Q
13

Stille, H. (2015), Rock Grouting: Theories and Applications, BeFo, Stockholm, pp. 90-94.

14

Tsang, Chin-Fu, Bernier, F., Davies, C. (2005), “Geohydromechanical processes in the excavation damaged zone in crystalline rock, rock salt, and indurated and plastic clays-in the context of radioactive waste disposal”, International Journal of Rock Mechanics and Mining Sciences, Vol. 42, No. 1, pp. 109-125.

10.1016/j.ijrmms.2004.08.003
15

Wang, X., Tan, Z., Wang, M., Zhang, M., Ming, H. (2008), “Theoretical and experimental study of external water pressure on tunnel lining in controlled drainage under high water level”, Tunnelling and Underground Space Technology, Vol. 23, No. 5, pp. 552-560.

10.1016/j.tust.2007.10.004
16

Ying, H.W., Zhu, C.W., Gong, X.N. (2016), “Analytic solution on seepage field of underwater tunnel considering grouting circle”, Journal of Zhejiang University, Vol. 50, No. 6, pp. 1018-1023.

10.3785/j.issn.1008-973X.2016.06.002
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 27
  • No :6
  • Pages :605-622
  • Received Date : 2025-10-31
  • Revised Date : 2025-11-19
  • Accepted Date : 2025-11-19
  • DOI :https://doi.org/10.9711/KTAJ.2025.27.6.605
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