A study on ground surface settlement due to groundwater drawdown during tunnelling

paper presents the results of investigation on tunnelling-induced ground surface settlement characteristics in water bearing ground using finite element (FE) stress-pore pressure coupled analysis. Fundamental interaction mechanism of ground and groundwater lowering was first examined and a number of influencing factors on the results of the coupled FE analysis were identified. A parametric study was then conducted on the influencing factors such as rock type, thickness of soil layer, permeability of shotcrete lining, among others. The results indicate that the tunneling-induced groundwater drawdown results in a deeper and wider settlement trough than without groundwater drawdown, and that the Error function approach does not yield satisfactory result in predicting a settlement profile. The results of analysis are summarized so that the relationship between the settlement and the influencing factors can be identified.

keywords: Tunnelling, Groundwater, Settlement, Finite element analysis, 터널굴착, 지하수, 지표침하, 유한요소해석, Tunnelling, Groundwater, Settlement, Finite element analysis

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Article Contents

Vol.9 No.4

A study on ground surface settlement due to groundwater drawdown during tunnelling

Abstract

Reference

(사)한국터널지하공간학회