Numerical Simulations for Analysis of Face Stability of Tunnelling

A. M. Atta Elmanan, H. Elarabi

Abstract


The aim of this paper is to evaluate numerical procedures that are used for analysis of face stability of a tunnelling. Two-dimensional (2D) and threedimensional (3D) Finite Element (FE) modelling of the Second Heinenoord Tunnel in Netherlands were done by using PLAXIS programs. The models were simulated the tunnel boring machine (TBM) with shell element and the slurry pressure with applied face pressure that measured in the site from the literature. Two methods were used to determine the situation of face failure. The first method was done by reducing the applied face pressure until the failure of the face was occurred, so the minimum required face pressure was determined. The second one was done by reducing the shear strength of the soil until the face failure, so the safety factor was determined. Both methods were applied for 2D and 3D FE-modelling. The results were presented and discussed. Also, the results of the minimum required support pressure were compared to the result of the centrifugal test model for the Second Heinenoord Tunnel found in literature. It was found that, the reducing applied face pressure method is much better than the reducing shear strength method. Also, the result of 3D FE-modelling gave better prediction when comparing with the experimental result .

Keywords


Tunnels;numerical modelling; heading stability;safety factor;face pressure

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References


Atta Elmanan, A. M. & Elarabi, H., “Analytical and Numerical Analysis of Tunnel Heading Stability”. the 7th Graduate Studies and Scientific Research Conference, University of Khartoum, Sudan, 2016.

Attaelmanan, A. M., “Elementary and Finite Element Methods for Analysis of Closed Face Tunnels”. Unpublished M.Sc. Thesis, University of Khartoum, Sudan, 2016.

Broere, W., “Tunnel Face Stability & New CPT Applications”. Ph.D. thesis, Delft University Press, Delft, The Netherlands, 2001.

Möller, S., “Tunnel Induced Settlements and Structural Forces in Linings”. PhD Thesis, Stuttgart University, 2006.

Bakker, K. J., “Monitoring the second heinenoord tunnel”. Commission k100, report, Centre for Underground Consturction (COB), The Netherlands, 1999.

Cai, F. & Ugai, K., “Reinforcing mechanism of anchors in slopes: a numerical comparison of results of LEM and FEM”. Numerical and Analytical Methods in Geomechanics (27): 549–564. 2003.

Zeinkiewicz, O. C., Humpheson, C. & Lewis, R. W., “Associated and nonassociated visco-plasticity in soil mechanics”. Geotschique (25): 671–689. 1975.

Terzaghi, K., “Theoretical Soil Mechanics”. John Wiley & Sons, 1951.

Huder, J., “Stability of bentonite slurry trenches with some experiences in Swiss practice”. In Fifth ECSMFE, Madrid, volume 1, pages 517–522, 1972.

Prater, E. G., “Die Gewölbewirkung der Schlitzwänd”. Der Bauingenieur, 48:125–131, 1973.

Chambon, P. and Corté, J. F., “Shallow tunnels in cohesionless soil: Stability of tunnel face”. ASCE Journal of Geotechnical Engineering, 120:1148–1165, 1994.

Brinkgreve, R. B. J. and Vermeer, P. A., “PLAXIS Finite Element Code for Soil and Rock Analyses”. A. A. Balkema, Rotterdam, 2001.

A. M. Atta Elmanan, H. Elarabi /JBRR (20) 17-28

Journal of BRR Volume (20) 2017 -28

PLAXIS 3D Tunnel User’s Manual. Delft, Netherlands: Delft University of Technology & PLAXIS B.V, 2004.

Vermeer, P. A., “On a smart use of 3D-FEM in Tunnelling”, PLAXIS Bulletin 11, 2001.

Bakker, K. J., F. de Boer & KUiper j. C., “Extensive independent research programs on Second Heinenoord tunnel and Botlek Rail tunnel”. in: XII ECSMGE, Amsterdam, The Netherlands, 1999b.

Chapman, D. N. and Metje, N., and Stärk, A., “Introduction to tunnel construction”. Spon Press, 2010.

Jancsecz, S. and Steiner, W., “Face support for a large mix shield in heterogeneous ground condition”, Proceedings of Tunnelling 1994 Conference, The Institution of Mining and Metallurgy, London, pp. 531–50, 1994.

Thomson, J., “Pipejacking and Microtunnelling”, Blackie Academic and Professional, London, 1995. [19] Vermeer, P. A., Möller, S. C. & Ruse, N., “On the Application of Numerical Analysis in Tunnelling”. Institute of Geotechnical Engineering, Stuttgart, Germany.


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