Evaluation of innovative sprayed-concrete-lined tunnelling

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Jones, Benoît ; Thomas, A. H. (Alun H.) ; Hsu, Y. S. (Yu Sheng) ; Hilar, M. (2008)

The front-shunt tunnel was the first tunnel of the Terminal 5 project at Heathrow to be constructed, and was the first section of sprayed-concrete-lined (SCL) tunnel to be constructed using the method known as LaserShell. This innovation represented a significant deviation from the methods previously used in SCL construction. Therefore it was subjected to a careful examination before and during construction using sophisticated 3D numerical modelling and monitoring during construction. The paper presents typical results from surface settlement levelling, inclinometers and extensometers, pressure cells and tunnel lining displacement measurements, and comments on the performance of the methods and instruments used. The paper then presents the methodology and typical results of the numerical modelling, and shows that the predictions of displacements and stresses compared well with the field measurements. In terms of the control of ground deformations and structural safety the tunnel performed well.
  • References (19)
    19 references, page 1 of 2

    1. WILLIAMS I., NEUMANN C., JA¨ GER J. and FALKNER L. Innovativer Spritzbeton-Tunnelbau fu¨ r den neuen Flughafenterminal T5 in London (Innovative shotcrete tunnelling for London Heathrow's new Terminal 5). Proceedings O¨ sterreichischer Tunneltag 2004, Salzburg, 2004, 41-61.

    2. HILAR M., THOMAS A. H. and FALKNER L. The latest innovation in sprayed concrete lining: the LaserShell method. Tunel (Magazine of the Czech Tunnelling Committee and the Slovak Tunnelling Committee ITA/ AITES), 2005, 4, 11-19.

    3. PECK R. B. Deep excavations and tunnelling in soft ground. Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico, 1969, State-of-the-art report, 225-290.

    4. VAN DER BERG J. P., CLAYTON C. R. I. and POWELL D. B. Displacements ahead of an advancing NATM tunnel in the London Clay. Ge´otechnique, 2003, 53, No. 9, 767-784.

    5. NYREN R. J., STANDING J. R. and BURLAND J. B. Surface displacements at St James's Park greenfield reference site above twin tunnels through the London Clay. In Building Response to Tunnelling: Case Studies from Construction of the Jubilee Line Extension, London. CIRIA, London, 2001, Vol. 1, pp. 387-400.

    6. DEANE A. P. and BASSETT R. H. The Heathrow Express trial tunnel. Proceedings of the Institution of Civil Engineers, Geotechnical Engineering, 1995, 113, No. 3, 144-156.

    7. BOCK H. Geotechnical instrumentation of tunnels. In Summerschool on Rational Tunnelling (KOLYMBAS D. (ed.)). Logos Verlag, Berlin, 2003, pp. 187-224.

    8. CLAYTON C. R. I., HOPE V. S., HEYMANN G., VAN DER BERG J. P. and BICA A. V. D. Instrumentation for monitoring sprayed concrete lined soft ground tunnels. Proceedings of the Institution of Civil Engineers, Geotechnical Engineering, 2000, 143, No. 3, 119-130.

    9. JONES B. D. Measurements of ground pressure on sprayed concrete tunnel linings using radial pressure cells. Proceedings of Underground Construction 2005, London, 2005 (CD-ROM).

    10. CHANG J., SCOTT J. M. and POUND C. Numerical study of Heathrow cofferdam. Proceedings of the 2nd International Symposium FLAC and Numerical Modeling in Geomechanics, Lyon, 2001, 163-169.

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