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9 results on '"Mair R"'

1. Tunnelling and geotechnics: new horizons.

Author

Mair, R. J.

Subjects
*ENGINEERING geology, *UNDERGROUND construction, *EARTHWORK, *TUNNEL lining, *CONCRETE construction, *HYDRAULIC structures, *UNDERGROUND pipelines, *SOIL permeability, *EXCAVATION (Civil engineering), *OPTICAL fiber detectors
Abstract

New developments in both the theory and the practice of tunnelling are covered in the lecture. The important relationship between tunnelling and geotechnics is highlighted, and recent advances in research and practice are described, drawing on model studies, theoretical developments and field measurements from case histories from around the world. Simplified plasticity models are presented that can be used by designers to assess ground movements and tunnel lining loads in complex ground conditions. The important role of pilot tunnels and in situ measurements to validate such models, drawing on a case history from Bolu, Turkey, and on other tunnelling projects, is described. Recent technical advances in earth pressure balance tunnelling are considered, illustrated by measurements from the Channel Tunnel Rail Link project, with emphasis on key factors influencing volume loss, such as face pressure, soil conditioning and effective screw conveyor operation. A recent case history in Bologna is described, in which the innovative use of directional drilling to install curved grout tubes was employed for a compensation grouting project in granular soils. Timedependent ground movements and tunnel lining distortions occurring after tunnelling are discussed, their magnitude depending on the relative permeability of the tunnel lining and soil, the degree of anisotropy of the soil permeability, and the initial pore pressure prior to tunnelling. The effects of tunnelling-induced settlements on pipelines are considered, drawing on centrifuge tests and analytical solutions, and a new design approach is presented, taking into account the reduction of soil stiffness with increasing shear strain as a result of tunnel volume loss. The lecture concludes with a description of a distributed strain sensing technique using fibre optic technology, based on Brillouin optical time domain reflectometry (BOTDR), and its innovative application to field monitoring of a masonry tunnel subjected to new tunnel construction beneath it. [ABSTRACT FROM AUTHOR]

Published
2008
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2. Centrifuge modelling of the effects of soil loading on flexible sewer liners.

Author

Spasojevic, A. D., Mair, R. J., and Gumbel, J. E.

Subjects
*SOILS, *LOADING & unloading, *SEWER pipes, *CENTRIFUGES, *DEFORMATIONS (Mechanics), *DESIGN, *ENVIRONMENTAL remediation, *SOIL-structure interaction
Abstract

This paper presents an experimental study of the effects of soil loading on large-diameter, close-fitting, nonbonded, flexible sewer liners as typified by ‘cured-in-place pipes’ (CIPP). CIPP is the process whereby a polymeric pipe lining is cast directly against the wall of a deteriorating sewer pipe. The transfer of soil loading to CIPP liners is strongly influenced by the interaction between the existing host pipe and the surrounding soil. In adjusting to deterioration events of the host pipe and possible void formation in the soil, the existing pipe-soil structure deforms and interacts with the liner inside it. By monitoring deformations of the liner and host structure the magnitude of load transfer can be inferred. The paper describes 1/30th scale physical models tested in dry sand under 30g of centrifugal acceleration. The models included: (a) a host pipe with two simulated modes of deterioration; (b) an instrumented close-fitting, nonbonded, flexible liner; (c) voids in the soil; and (d) moving, heavy traffic loading. The tests showed that, even under extreme loading conditions, the deformations of the liner are relatively small (2-3% of diameter), implying that the presence of a thin, flexible non-bonded and close-fitting liner has an important stiffening effect on the response of the deteriorating host pipe. The important influence of void position in the surrounding soil was also demonstrated. [ABSTRACT FROM AUTHOR]

Published
2007
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3. Predicting 2D ground movements around tunnels in undrained clay.

Author

Osman, A. S., Bolton, M. D., and Mair, R. J.

Subjects
CLAY, EARTHWORK, TUNNELS, TUNNEL design & construction, MECHANICS (Physics), EXCAVATION (Civil engineering)
Abstract

Copyright of Géotechnique is the property of Thomas Telford Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2006
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4. Estimating the Effects of Tunneling on Existing Pipelines.

Author

Vorster, T. E. B., Klar, Assaf, Soga, Kenichi, and Mair, R. J.

Subjects
BENDING moment, PIPELINES, TUNNEL design & construction, EARTHWORK, MINING engineering, ENGINEERING geology, ENVIRONMENTAL engineering, ENGINEERING
Abstract

A method is presented for estimating the maximum bending moment for continuous (or rigidly jointed) pipelines affected by tunnel-induced ground movement. The estimation can be made based on the knowledge of tunnel and pipeline geometries, the stiffness of soil and pipeline, and tunnel-induced ground deformation at the pipeline level. The method takes account of soil nonlinearity by an equivalent linear approach, in which the stiffness of the soil is evaluated based on an average deviatoric strain developed along the pipeline. The approach is conservative and promises that the bending moment is not underestimated. The validity of the method as an upper bound approximation is evaluated against centrifuge test results. [ABSTRACT FROM AUTHOR]

Published
2005
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5. Design, construction and performance of a 700-m ‘cover and cut’ tunnel in soft clay, Norway

Author

Fredriksen, F. J., Aabøe, Roald, Hasle, G. J., Arthur, L. J., Darby, A. W., Rafoneke, B., Daws, Graham, MacDonald, Dan, Innaurato, Nicola, Mancini, Renato, Rondena, Enrico, Zaninetti, Attilio, Coutts, A. W. P., Davies, H. R., Curtis, R. S., Finch, A. P., Lovat, R. P., Deane, A. P., Burgess, K. T., Knights, M. C., Oswell, M. A., Farmer, I. W., Mak, B. W. L., Morfeldt, Daniel, Martin, C. J. H., Pakes, G., Finnsson, Sigurdur, Janzon, H. A., Laughton, C., Nelson, P. P., Abd Al-Jalil, Y., Remington, R., Caspe, H. P., Kim, A. Y., Bergen, L. J., Araujo, J. R., Harpf, Richard, Axhausen, Klaus, Hellings, J. E., Mair, R. J., Harris, D. I., Love, J. P., Blakey, D., Kettle, C., New, B. M., Bowers, K. H., Aarvold, Vidar, Chudleigh, I. L. J., Webb, N. S., Featherstone, G. A., Bandmann, Manfred, Ramisch, H., Beckmann, Uwe, Cole, B. J., Lees, H. J., Dietz, Walter, Fawcett, D. F., Chapman, P. J., Barratt, D. A., O’Reilly, M. P., Temporal, John, Baston-Pitt, Jon, Fredriksen, F. J., Aabøe, Roald, Hasle, G. J., Hobson, D. A., Gilchrist, D. C., Jancsecz, Sandor, Steiner, Walter, Farrow, J. P., Claye, P. M., Warren, R. B., Ginary, M. A., Matthews, R., Kruizenga, H., Weeks, C. R., Winterton, T. R., Leblais, Y., Leblond, L., Malios, Yannis, Peron, J. Y., Marcheselli, P., Catling, P., Scholey, J., Murray, A. D., Marrai, Bruno, Davies, P. G., Tibau, Guilherme, Gutenwik, Erik, Santana, Maurício, Pellegri, Pierre Jean, Fowell, R. J., Richardson, G., Gollick, M. J., Beatty, J. G., Ganey, R. J., and Killingsworth, J. E.

Published
1994
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6. Open TBM tunnelling in complex geology for railroad in Sweden

Author

Janzon, H. A., Arthur, L. J., Darby, A. W., Rafoneke, B., Daws, Graham, MacDonald, Dan, Innaurato, Nicola, Mancini, Renato, Rondena, Enrico, Zaninetti, Attilio, Coutts, A. W. P., Davies, H. R., Curtis, R. S., Finch, A. P., Lovat, R. P., Deane, A. P., Burgess, K. T., Knights, M. C., Oswell, M. A., Farmer, I. W., Mak, B. W. L., Morfeldt, Daniel, Martin, C. J. H., Pakes, G., Finnsson, Sigurdur, Janzon, H. A., Laughton, C., Nelson, P. P., Abd Al-Jalil, Y., Remington, R., Caspe, H. P., Kim, A. Y., Bergen, L. J., Araujo, J. R., Harpf, Richard, Axhausen, Klaus, Hellings, J. E., Mair, R. J., Harris, D. I., Love, J. P., Blakey, D., Kettle, C., New, B. M., Bowers, K. H., Aarvold, Vidar, Chudleigh, I. L. J., Webb, N. S., Featherstone, G. A., Bandmann, Manfred, Ramisch, H., Beckmann, Uwe, Cole, B. J., Lees, H. J., Dietz, Walter, Fawcett, D. F., Chapman, P. J., Barratt, D. A., O’Reilly, M. P., Temporal, John, Baston-Pitt, Jon, Fredriksen, F. J., Aabøe, Roald, Hasle, G. J., Hobson, D. A., Gilchrist, D. C., Jancsecz, Sandor, Steiner, Walter, Farrow, J. P., Claye, P. M., Warren, R. B., Ginary, M. A., Matthews, R., Kruizenga, H., Weeks, C. R., Winterton, T. R., Leblais, Y., Leblond, L., Malios, Yannis, Peron, J. Y., Marcheselli, P., Catling, P., Scholey, J., Murray, A. D., Marrai, Bruno, Davies, P. G., Tibau, Guilherme, Gutenwik, Erik, Santana, Maurício, Pellegri, Pierre Jean, Fowell, R. J., Richardson, G., Gollick, M. J., Beatty, J. G., Ganey, R. J., and Killingsworth, J. E.

Published
1994
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7. Application of NATM to design of underground stations in London Clay

Author

Deane, A. P., Arthur, L. J., Darby, A. W., Rafoneke, B., Daws, Graham, MacDonald, Dan, Innaurato, Nicola, Mancini, Renato, Rondena, Enrico, Zaninetti, Attilio, Coutts, A. W. P., Davies, H. R., Curtis, R. S., Finch, A. P., Lovat, R. P., Deane, A. P., Burgess, K. T., Knights, M. C., Oswell, M. A., Farmer, I. W., Mak, B. W. L., Morfeldt, Daniel, Martin, C. J. H., Pakes, G., Finnsson, Sigurdur, Janzon, H. A., Laughton, C., Nelson, P. P., Abd Al-Jalil, Y., Remington, R., Caspe, H. P., Kim, A. Y., Bergen, L. J., Araujo, J. R., Harpf, Richard, Axhausen, Klaus, Hellings, J. E., Mair, R. J., Harris, D. I., Love, J. P., Blakey, D., Kettle, C., New, B. M., Bowers, K. H., Aarvold, Vidar, Chudleigh, I. L. J., Webb, N. S., Featherstone, G. A., Bandmann, Manfred, Ramisch, H., Beckmann, Uwe, Cole, B. J., Lees, H. J., Dietz, Walter, Fawcett, D. F., Chapman, P. J., Barratt, D. A., O’Reilly, M. P., Temporal, John, Baston-Pitt, Jon, Fredriksen, F. J., Aabøe, Roald, Hasle, G. J., Hobson, D. A., Gilchrist, D. C., Jancsecz, Sandor, Steiner, Walter, Farrow, J. P., Claye, P. M., Warren, R. B., Ginary, M. A., Matthews, R., Kruizenga, H., Weeks, C. R., Winterton, T. R., Leblais, Y., Leblond, L., Malios, Yannis, Peron, J. Y., Marcheselli, P., Catling, P., Scholey, J., Murray, A. D., Marrai, Bruno, Davies, P. G., Tibau, Guilherme, Gutenwik, Erik, Santana, Maurício, Pellegri, Pierre Jean, Fowell, R. J., Richardson, G., Gollick, M. J., Beatty, J. G., Ganey, R. J., and Killingsworth, J. E.

Published
1994
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8. Channel tunnel: French undersea crossover design and construction

Author

Leblais, Y., Leblond, L., Arthur, L. J., Darby, A. W., Rafoneke, B., Daws, Graham, MacDonald, Dan, Innaurato, Nicola, Mancini, Renato, Rondena, Enrico, Zaninetti, Attilio, Coutts, A. W. P., Davies, H. R., Curtis, R. S., Finch, A. P., Lovat, R. P., Deane, A. P., Burgess, K. T., Knights, M. C., Oswell, M. A., Farmer, I. W., Mak, B. W. L., Morfeldt, Daniel, Martin, C. J. H., Pakes, G., Finnsson, Sigurdur, Janzon, H. A., Laughton, C., Nelson, P. P., Abd Al-Jalil, Y., Remington, R., Caspe, H. P., Kim, A. Y., Bergen, L. J., Araujo, J. R., Harpf, Richard, Axhausen, Klaus, Hellings, J. E., Mair, R. J., Harris, D. I., Love, J. P., Blakey, D., Kettle, C., New, B. M., Bowers, K. H., Aarvold, Vidar, Chudleigh, I. L. J., Webb, N. S., Featherstone, G. A., Bandmann, Manfred, Ramisch, H., Beckmann, Uwe, Cole, B. J., Lees, H. J., Dietz, Walter, Fawcett, D. F., Chapman, P. J., Barratt, D. A., O’Reilly, M. P., Temporal, John, Baston-Pitt, Jon, Fredriksen, F. J., Aabøe, Roald, Hasle, G. J., Hobson, D. A., Gilchrist, D. C., Jancsecz, Sandor, Steiner, Walter, Farrow, J. P., Claye, P. M., Warren, R. B., Ginary, M. A., Matthews, R., Kruizenga, H., Weeks, C. R., Winterton, T. R., Leblais, Y., Leblond, L., Malios, Yannis, Peron, J. Y., Marcheselli, P., Catling, P., Scholey, J., Murray, A. D., Marrai, Bruno, Davies, P. G., Tibau, Guilherme, Gutenwik, Erik, Santana, Maurício, Pellegri, Pierre Jean, Fowell, R. J., Richardson, G., Gollick, M. J., Beatty, J. G., Ganey, R. J., and Killingsworth, J. E.

Published
1994
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9. Tunnel ring design, development, testing and manufacture for the London Water Ring Main

Author

Farrow, J. P., Claye, P. M., Warren, R. B., Ginary, M. A., Matthews, R., Arthur, L. J., Darby, A. W., Rafoneke, B., Daws, Graham, MacDonald, Dan, Innaurato, Nicola, Mancini, Renato, Rondena, Enrico, Zaninetti, Attilio, Coutts, A. W. P., Davies, H. R., Curtis, R. S., Finch, A. P., Lovat, R. P., Deane, A. P., Burgess, K. T., Knights, M. C., Oswell, M. A., Farmer, I. W., Mak, B. W. L., Morfeldt, Daniel, Martin, C. J. H., Pakes, G., Finnsson, Sigurdur, Janzon, H. A., Laughton, C., Nelson, P. P., Abd Al-Jalil, Y., Remington, R., Caspe, H. P., Kim, A. Y., Bergen, L. J., Araujo, J. R., Harpf, Richard, Axhausen, Klaus, Hellings, J. E., Mair, R. J., Harris, D. I., Love, J. P., Blakey, D., Kettle, C., New, B. M., Bowers, K. H., Aarvold, Vidar, Chudleigh, I. L. J., Webb, N. S., Featherstone, G. A., Bandmann, Manfred, Ramisch, H., Beckmann, Uwe, Cole, B. J., Lees, H. J., Dietz, Walter, Fawcett, D. F., Chapman, P. J., Barratt, D. A., O’Reilly, M. P., Temporal, John, Baston-Pitt, Jon, Fredriksen, F. J., Aabøe, Roald, Hasle, G. J., Hobson, D. A., Gilchrist, D. C., Jancsecz, Sandor, Steiner, Walter, Farrow, J. P., Claye, P. M., Warren, R. B., Ginary, M. A., Matthews, R., Kruizenga, H., Weeks, C. R., Winterton, T. R., Leblais, Y., Leblond, L., Malios, Yannis, Peron, J. Y., Marcheselli, P., Catling, P., Scholey, J., Murray, A. D., Marrai, Bruno, Davies, P. G., Tibau, Guilherme, Gutenwik, Erik, Santana, Maurício, Pellegri, Pierre Jean, Fowell, R. J., Richardson, G., Gollick, M. J., Beatty, J. G., Ganey, R. J., and Killingsworth, J. E.

Published
1994
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