Comparison of measured values and numerical analysis values for estimating smart tunnel based groundwater levels around vertical shaft excavation

Donghyuk Lee; Sangho Jung

doi:10.9711/KTAJ.2024.26.2.153

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2024 Vol.26, Issue 2 Preview Page

Research Paper

Comparison of measured values and numerical analysis values for estimating smart tunnel based groundwater levels around vertical shaft excavation 수직구 굴착시 스마트 터널기반 지하수위 현장계측과 수치해석 비교 연구

31 March 2024. pp. 153-167

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Abstract

Recently the ground settlement has been increasing in urban area according to development. And, this may attribute a groundwater level drawdown. This study presents an analysis of groundwater level drawdown for circular vertical shaft excavation of ｢○○○○ double track railway build transfer operate project｣. And, in-situ monitoring data and numerical analysis were compared. So, if we examine the groundwater level drawdown in design, ground conditions should be applied so that the site situation can be reflected. And, groundwater level should be considered a seasonal measurement in order to apply the appropriate groundwater level. It was confirmed a similar predicted value to groundwater level drawdown of in-situ monitoring data.

Keywords

Settlement

Vertical shaft excavation

Numerical analysis

In-situ monitoring data

Groundwater level drawdown

최근 도심지에 개발이 이루어지면서 지반침하가 증가하고 있으며, 그에 대한 원인 중 하나는 지하수위의 변화이다. 본 연구에서는 굴착깊이가 깊은 수직구 굴착공사의 한 예로 ｢○○○○ 복선전철 민간투자사업｣의 작업구를 대상으로 지하수위 저하량에 대한 현장계측 결과와 수치해석 결과를 비교 분석하였다. 이를 통하여 지하수위 저하에 대한 검토를 실시할 경우, 현장조건들이 충분히 반영될 수 있도록 지반조건을 분석하여 적용하여야 하며, 지하수위는 측정시기를 확인하여 적절한 수위를 적용하여야 시공 시 지하수위의 저하량과 유사한 예측 값을 도출해 낼 수 있음을 확인하였다.

키워드

지반침하

수직구

수치해석

계측

지하수위 저하

References

Chung, S.Y., Kim, B.W., Kang, D.H., Shim, B.O., Cheong, S.W. (2007), "Analyses of hydrology and groundwater level fluctuation in granite aquifer with tunnel excavation", The Journal of Engineering Geology, Vol. 17, No. 4, pp. 643-653.

Jo, H.T., Choi, J.H., Jung, J.H. (2020), "Example of ground subsidence due to groundwater drawdown during underground excavation in urban areas", Proceedings of the KSCE 2020 Convention, Jeju, pp. 1377-1378.

MOLIT (2022), Korean construction specification for temporary earth retaining works KCS 21 30 00: 2022, Ministry of Land, Infrastructure and Transport, pp. 8.

Moon, J.S., Zheng, A.Q., Jang, S. (2017), "Assessment of groundwater inflow rate into a tunnel considering groundwater level drawdown and permeability reduction with depth", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 2, pp. 109-120. 10.9711/KTAJ.2017.19.2.109

Nextrain Co., Ltd. (2020), ○○○○ Report on the implementation of private investment projects for double-line railways, No. 3, pp. 1-204.

Yoo, C.S. (2003), "3D coupled analysis on tunneling under groundwater", Journal of Korean Tunnelling and Underground Space Association, Vol. 5, No. 2, pp. 175-187.

Yoo, C.S., Kim, S.B. (2007), "A study on ground surface settlement due to groundwater drawdown during tunnelling", Journal of Korean Tunnelling and Underground Space Association, Vol. 9, No. 4, pp. 361-375.

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 : 26
No :2
Pages :153-167
Received Date : 2024-02-14
Revised Date : 2024-03-15
Accepted Date : 2024-03-26
DOI :https://doi.org/10.9711/KTAJ.2024.26.2.153

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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