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2019 Vol.29, Issue 2 Preview Page

Research Article

Evaluation of Groundwater Level Decline and Water Quality Due to Tunnel Excavation

터널굴착으로 인한 지하수위 저하 및 수질영향 평가

Min Gyu Kim1
,
Minsoo Kim2
,
Gyocheol Jeong3
,
Jeongwoo Lee4
,
Il-Moon Chung5*
김 민규1
,
김 민수2
,
정 교철3
,
이 정우4
,
정 일문5*
1Department of Land, Water and Environment Research, KICT, Research Specialist
2Daelim Industrial Co. Ltd., Director
3Department of Earth and Environmental Science, Andong National University, Professor
4Department of Land, Water and Environment Research, KICT, Research Fellow
5Department of Land, Water and Environment Research, KICT, Senior Research Fellow
1한국건설기술연구원 국토보전연구본부, 전임연구원
2대림산업, 상무
3안동대학교 지구환경과학과, 교수
4한국건설기술연구원 국토보전연구본부, 연구위원
5한국건설기술연구원 국토보전연구본부, 선임연구위원
* Corresponding Author
30 June 2019. pp. 113-122
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Abstract

In this study, the flow analysis to evaluate the extent of groundwater decline and the effect of the small valleys caused by the decrease of groundwater level in the construction of road tunnel, and the pollutant movement analysis to evaluate pollution of nearby water source by pollutant discharge during tunnel construction, respectively. The decrease of the groundwater during the 30 month tunnel excavation period was maximum 27 m and it was found to be the largest within 50 m from the tunnel center. The flow of groundwater is shown in the form of flowing into the tunnels and the effects of groundwater level decline were observed up to a tunnel radius of 200 m. As a result of the numerical modeling of the contaminant transport to examine the influence of the polluted water discharge from the tunnel, the range of the turbid water generated at the end of the tunnel is up to 120 m and it is estimated that the risk of contamination of the small river is not large.

Keywords
tunnel excavation
groundwater level drawdown
contaminant transport
effective distance

본 연구에서는 도로터널 건설시 감소하는 지하수위 저하의 범위와 이로 인한 인근 계곡 소하천의 영향을 평가하기 위한 유동해석 및 터널공사 시 오탁수 배출에 의한 인근 수원의 오염여부를 평가하기 위한 오염물 이동 해석을 수행하였다. 터널굴착 공기인 30개월 동안 하강하는 지하수의 저하량은 최대 27 m로 나타났고 터널중심에서 50 m 이내에서 가장 큰 것으로 확인되었다. 또한 이로 인한 지하수의 유동이 터널 내로 유입되는 형상으로 보여주고 있으며 터널반경 200 m까지는 적지만 수위저하의 영향이 나타났다. 터널에서 배출되는 오탁수 배출의 영향을 검토하기 위한 오염물 이동 수치모델링 결과 터널종단부에서 발생하는 탁수의 거동범위는 최대 120 m내외이며 이로 인한 소하천의 오염 위험은 크지 않을 것으로 평가되었다.

키워드
터널굴착
지하수위 강하
오염물 이동
영향거리
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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 : 29
  • No :2
  • Pages :113-122
  • Received Date : 2019-05-23
  • Revised Date : 2019-06-20
  • Accepted Date : 2019-06-20
  • DOI :https://doi.org/10.9720/kseg.2019.2.113
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