Chinese Journal of Geotechnical Engineering· 2013Q2
Mechanism of transverse deformation and assessment index for shield tunnels in soft clay under surface surcharge
- 47citations
- Q2SCImago
- 2013year
Short summary
Tunnel diameter variation can serve as a reliable assessment index to predict the performance and safety of shield tunnels in soft soils under surface surcharge.
AI-generated from the title and abstract; the full text is not read.
Key points
- Surface surcharge is a leading cause of transverse deformation in shield tunnels.
- Tunnel diameter variation is dependent on joint opening and stress states within the tunnel.
- Tunnel diameter change can be used as an assessment index for shield tunnel performance in soft soils.
- Criteria for tunnel assessment are determined based on measured diameter changes.
AI-generated from the title and abstract; the full text is not read.
Abstract
The transverse deformation of shield tunnels may ultimately threaten the safety of tunnel structure.The surcharge above the tunnels is one of the leading factor to cause their transverse deformation.The evolution of transverse defromation of the tunnels under surchage is firstly studied using numerical simulation considering the effect of the elastic resistance of surrounding soil and lateral coefficient of earth pressure at rest.It is found that the development of joint opening and the stress states of both tunnel concrete and bolts are dependent on the variation of tunnel diameter.Thus,the variation of tunnel diameter can be taken as the assessment index to predict the performance of shield tunnels in soft soils.The criteria for tunnel assessment are determined in terms of diameter change.Then,a geometry-based simple method is proposed to study the relationship between joint opening and tunnel squating based on the tunnel crown settlement.The method is verified by the abovementioned numerical simulation.This simple method provides a very convenient way to estimate the safety state of shield tunnels.
The authors' abstract, as published at the source. Chinese Journal of Geotechnical Engineering, 2013 · DOI ↗
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Field: General Engineering
General EngineeringEngineering