Experience with CPTU, T-bar and ball penetrometers in two soft clays.

• Autorzy: Lunne T.
• Języki publikacji: EN

Abstrakty

EN

Field developments in deep waters with very soft soils have led to increased reliance on the use of in situ tests to evaluate soil design parameters. Recently the T-bar and ball penetrometers have been introduced due to their potential for increasing the reliability of interpreted undrained shear strength relative to the CPTU for soft clays. Empirical correlations based on field tests and laboratory tests on samples at two onshore soft clay sites indicate that T-bar correlation factors are in a somewhat narrower range compared to cone factors. Recommendations are given in terms of cone and T-bar factors to use.

Słowa kluczowe

PL

sonda statystyczna CPT; sondowanie statystyczne; badania gruntu; grunty słabonośne

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2007
• Tom: Vol. 29, nr 1-2
• Strony: 87--101
• Opis fizyczny: Bibliogr. 13 poz.

Twórcy

autor

Lunne T.

• Norwegian Geotechnical Institute, Oslo, Norway

Bibliografia

• [1] CHUNG S.F., RANDOLPH M.F., Penetration resistance in soft clay for different shaped penetrometers, Proc. 2nd Int. Conf. on Site Characterisation, Porto, Sept. 2004, Vol. I, pp. 671-678.
• [2] ISSMGE 1999. ISSMGE Technical Committee TCI 6 Ground Property Characterisation from In-situ Testing (1999) International Reference Test Procedure (IRTP) for the Cone Penetration Test (CPT) and the Cone Penetration Test with Pore Pressure (CPTU), Proc. XII ECSMGE, Amsterdam, Balkema, pp. 2195-2222.
• [3] LEFEBVRE G., POULIN C, A new method of sampling in sensitive clay, Canadian Geotechnical Journal, 1979, Vol. 16.
• [4] LONG M., GUDJONSSON G.T., T-bar testing in Irish soils, Proc. 2nd Int. Conf. on Site Characterisation, Porto, Sept. 2004, Vol. I, pp. 719-726.
• [5] LUNNE T., In situ testing in offshore geotechnical investigations, Proc. Int. Conf. on in Situ Measurements of Soil Properties and Case Histories, Bali, 2001, pp. 61-81.
• [6] LUNNE T., ROBERTSON P.K., POWELL J.J.M., Cone Penetration Testing in Geotechnical Practice, Spon Press, London, 1997, 312 pages.
• [7] LUNNE T., BERRE T., ANDERSEN K.H., TJELTA T.I., Deepwater sample disturbance due to stress relief, Proc. OTRC Int. Conf. on Geotechnical, Geological and Geophysical Properties of Deepwater Sediments, OTRC, 2001, pp. 64-85.
• [8] LUNNE T., LONG M., FORSBERG C.F., Characteristics and engineering properties of Onsoy clay, Proc. Workshop on Characterisation and Engineering Properties of Natural Soils, November 2002. 2003, Vol. 1, pp. 395-128.
• [9] LUNNE T., RANDOLPH M.F., CHUNG S.F., ANDERSEN K.H., SJURSEN M.A., Comparison of cone and T-bar factors in two onshore and one offshore clay sediments, Proc. Frontiers in Offshore Geotech-nics; ISFOG 2005, Perth, Sept. 2005, pp. 981-989.
• [10] RANDOLPH M.F., Characterisation of soft sediments for offshore applications, Keynote Lecture in Proc. 2nd International Conf. on Site Characterisation, Porto, Sept. 2004, pp. 209-232.
• [11] RANDOLPH M.F., ANDERSEN K.H., Numerical analyses of T-bar penetration in soft clay, 2006, paper in preparation.
• [12] RANDOLPH M.F., HEFER P.A., GEISE J.M., WATSON P.G., Improved seabed strength profiling using T-bar penetrometer, Proc. Int. Conf. Offshore Site Invest, and Foundation Behaviour - 'New Frontiers', Society for Underwater Technology, London, 1998, pp. 221-235.
• [13] YAFRATE N.J., DEJONG J.T., Considerations in evaluating the remoulded undrained shear strength from full penetrometer cycling, Proc. Frontiers in Offshore Geotechnics; ISFOG 2005, Perth, Sept. 2005, pp. 991-997.