Investigation on Water Leakage-Induced Tunnel Structure and Ground Responses Using Coupled Hydro-Mechanical Analysis

Dohyun Park

doi:10.7474/TUS.2023.33.4.265

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2023 Vol.33, Issue 4 Preview Page Next Page

Research Article

Investigation on Water Leakage-Induced Tunnel Structure and Ground Responses Using Coupled Hydro-Mechanical Analysis 수리역학 연계해석을 이용한 누수로 인한 터널 구조물 및 지반 거동의 분석

31 August 2023. pp. 265-280

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Abstract

Water leakage in tunnels is a defect that can affect tunnel stability and the ground movement by changing the stress and pore water pressure of the surrounding ground. Long-term or large-scale water leaks may lead to damage of tunnel structure and the surrounding environment, such as tunnel lining instability and ground surface settlement. The present study numerically investigated the effects of water leakage on the structural stability of a tunnel and the ground behavior. The tunnel was assumed to be under undrained conditions for preventing the inflow of the surrounding water and leaks occurred in the concrete lining after completion of the tunnel construction. A coupled hydro-mechanical analysis using a TOUGH-FLAC simulator developed in Python was conducted for assessing the leakage induced-behavior of the tunnel structure and ground under different conditions of the amount and location of water leak. Additionally, the effect of hydro-mechanical coupling terms on the results of coupled response was investigated and discussed.

Keywords

Tunnel leakage

Hydro-mechanical analysis

Coupled response

Tunnel structure

TOUGH-FLAC

터널누수는 주변지반의 응력 및 간극수압을 변화시켜 터널 안정성 및 지반변형에 영향을 미칠 수 있는 결함요소이다. 장기간 또는 큰 규모의 누수발생은 터널 라이닝의 불안정성 및 지표침하와 같은 터널 구조물 및 주변지반 환경에 손상을 일으킬 수 있다. 본 연구에서는 누수발생 시 터널의 구조 안정성 및 지반 거동에 미치는 영향을 수치해석적으로 분석하였다. 고려된 터널은 내부로 주변 지하수의 유입을 허용하지 않는 비배수 조건으로 가정하였고 터널 완공 후 라이닝에서 누수가 발생하는 것으로 설정하였다. 누수로 인한 터널 구조물 및 지반의 거동을 모사하기 위해 수리역학 연계해석이 수행되었으며 파이썬으로 개발된 TOUGH-FLAC 시뮬레이터가 사용되었다. 누수 발생량과 누수위치를 변화시켜 수치모사가 수행되었으며 수리역학 해석을 위한 연계항들이 복합거동 결과에 미치는 영향을 조사하였다.

키워드

터널누수

수리역학 해석

연계거동

터널구조물

TOUGH-FLAC

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 33
No :4
Pages :265-280
Received Date : 2023-08-09
Revised Date : 2023-08-21
Accepted Date : 2023-08-22
DOI :https://doi.org/10.7474/TUS.2023.33.4.265

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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