Abstract
Tunnel excavation in shallow soft ground conditions of urban areas experiences inevitable surface settlements that threaten the stability of nearby infrastructures. Surface settlements during shield TBM tunneling are related to a number of factors including geotechnical conditions, tunnel geometry and excavation methods. In this paper, a database collected from a construction section of Hong Kong subway was used to analyze the correlation of settlement-inducing factors and surface settlements monitored at different locations of a transverse trough. The Pearson correlation analysis result revealed a correlation between the factors in consideration. Factors such as the face pressure, advance speed, thrust force, cutter torque, twin tunnel distance and ground water level presented a modest correlation with the surface settlement, while no significant trends between the other factors and the surface settlements were observed. It can be concluded that an integrated effect of the settlement-inducing factors should be related to the magnitude of surface settlements.
Original language | English |
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Pages (from-to) | 153-164 |
Number of pages | 12 |
Journal | Geomechanics and Engineering |
Volume | 21 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2020 Apr 25 |
Keywords
- Effective parameter
- Pearson correlation
- Shield TBM tunneling
- Surface settlement
- Twin tunnel
ASJC Scopus subject areas
- Civil and Structural Engineering
- Geotechnical Engineering and Engineering Geology