Evaluation of Swelling Strain in the Tunnel by Analytical Method

Document Type : Research Article

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Abstract

In this project, swelling strain and stress caused by tunnel excavation is determined. Two main parts of the performed analysis is mentioned here. First, swelling differential equation is solved by analytical method and the swelling quantities related to tunnel environment is calculated. Then in the second part, the amount of stresses of the tunnel environment caused by tunnel excavation is evaluated. Calculations of this part are processed by a finite element method that use isoperimetric element to model the tunnel. MATLAB code is used to process numerical model of the second part.

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References

[1]Barla, M., (1999), “Tunnels in swelling ground – Simulation of 3D stress paths by triaxial laboratory testing,” Ph. D. Thesis, Politecnico di Torino.
[2]Huder, J. and Amberg, G. (1970), “Quellung in Mergel, Opalinuston und anydrit”, chweizerische Bauzeitung. Vol.88, No. 43, pp. 975-980.
[3]Madsen, F.T., (1999), “Suggested methods for laboratory testing of swelling rocks,” International Journal of Rock and Mining Science, Vol. 26, No. 3,pp. 211-225.
[4]Wittke-Gattermann, P., (2003), “Dimensioning of Tunnels in Swelling Rock,” ISRM 2003–Technology roadmap for rock mechanics, South African Institute of Mining and Metallurgy.
[5]Wittke-Gattermann, P., (2003), “Dimensioning of Tunnels in Swelling Rock,” ISRM 2003–Technology roadmap for rock mechanics, South African Institute of Mining and Metallurgy.
[6]Wittke, w., (1990), “Rock Mechanics, Theory and  Applications with Case Histories,” Springer-Verlag Berlin Heidelberg.

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