Jain, H and Sitharam, TG (2023) Semi-analytical prediction of ground surface settlements due to EPB tunnelling in Kolkata. In: ITA-AITES World Tunnel Congress, ITA-AITES WTC 2023 and the 49th General Assembly of the International Tunnelling and Underground Association, 2023, 18 May 2023, Athens, pp. 1964-1970.
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Abstract
A novel Gaussian distribution function is used to model the ground volume loss around the tunnel periphery based on which an attempt has been made to predict the ground settlements by using linear elastic analytical solutions. A set of around 6 m diameter twin-tunnels spaced 6 m apart are being constructed in Kolkata using Earth Pressure Balance (EPB) Tunnel Boring Machines (TBMs) at a cover depth of around 20 m. The ground strata is predominantly silty clay, clayey silt with concentration of sand around the tunnel region. A ground volume loss of around 1-2% has been observed at different transverse sections on the tunnel alignment. Field monitoring reported after the tunnelling appears to conform with the analytical solutions. The disparity in the analytical and the field observations can be attributed to non-linear, anisotropic and non-homogenous soil behaviour around the tunnel opening. The simplicity of the solution allows it to be used by the engineers without having to go for complicated analytical and numerical solutions.
| Item Type: | Conference Paper |
|---|---|
| Publication: | Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World- Proceedings of the ITA-AITES World Tunnel Congress, WTC 2023 |
| Publisher: | CRC Press/Balkema |
| Additional Information: | The copyright for this article belongs to the Author. |
| Keywords: | Boring machines (machine tools); Construction equipment; Settlement of structures; Tunnels, Analytical predictions; Earth pressure balance; Gaussian distribution function; Ground settlement; Ground surface settlements; Linear elastic; Semi-analytical; Tunnel boring; Twin tunnels; Volume loss, Distribution functions |
| Department/Centre: | Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 06 Jul 2023 06:15 |
| Last Modified: | 06 Jul 2023 06:15 |
| URI: | https://eprints.iisc.ac.in/id/eprint/82119 |
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