2013•Chinese journal of rock mechanics and engineeringRequires access

RESEARCH ON POST-CONSTRUCTION SURFACE SETTLEMENT CAUSED BY SHIELD TUNNELING

Xinjiang Wei

Abstract

Excess pore pressure and post-construction consolidation settlement of soil above tunnel axis caused by shield tunneling were studied.A calculation method for stress release rate caused by shield tunneling was put forward.Based on the Henkel pore water pressure theory,the excess pore water pressure of soil adjacent to the tunnel lining was deduced.Supposing that the points around the lining have the same stress release rate,the calculating method for excess pore water pressure of soil at tunnel arch crown was obtained.Using the theory of stress transfer,the distribution mode of excess pore water pressure above the tunnel axis was proposed.Assuming that the thickness of compressed soil equals that of the soil above tunnel,the theoretical calculation formula for consolidation settlement of ground above the tunnel axis was suggested based on Terzaghi?s one-dimensional consolidation theory.The results of case study show that the calculated results are in good agreement with the measured data.

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Key concepts: Terzaghi's principle, Pore water pressure, Consolidation (business), Geotechnical engineering, Shield, Lateral earth pressure, Quantum tunnelling, Settlement (finance)