O precyzji sondowania statycznego na przykładzie badań gruntów przejściowych poletka badawczego AMU Morasko

• Autorzy: Wierzbicki Jędrzej , Młynarek Zbigniew , Wołyński Waldemar

Identyfikatory

DOI

10.7306/2020.25

Warianty tytułu

EN

On the quality of CPTU results in terms of precision; a case of soft intermediate soils, AMU Morasko test site

• Języki publikacji: PL

Abstrakty

EN

The Cone Penetration Test is one of the most versatile and widely used geotechnical tests over the world. Some differences in technical solutions between the equipment manufactured by different producers and the relatively quick wear of the penetrometer itself make the issue of quality and comparability of the CPTU results very actual. The tests were conducted in the testing ground of Adam Mickiewicz University in Poznań. The test site is located in the northern part of Poznań, within a marginal zone of the Poznań Phase of the Weichselian (Vistulian) glaciation. The subsoil consists of glacial till of the Riss glaciation and glacial till of the Vistulian glaciation, separated by fluvioglacial sandy sediments and covered with fine and medium sands with single gravel grains. The quality of geotechnical parameters of the tested subsoil was assessed for the initial constrained modulus and undrained shear strength. To determine these parameters, static penetrometers produced by two different manufacturers were used. The tests and the results of analysis were performed in three stages. In the first stage, each penetrometer was used to investigate homogeneity and diversity of the subsoil structure in the test sites. The subsoil structure diversity was examined by grouping statistically similar R_f coefficient values along the profile. In the second stage, the level of accuracy and precision in the assessment of the corrected cone resistance - q_t, friction on the friction sleeve-f_s, and pore pressure - u₂ was determined for individual penetrometers. In the next stage, the differences between the constrained modulus and undrained shear strength were determined for both penetrometers. This analysis takes into account the level of precision of the corrected cone resistance.

Słowa kluczowe

PL

jakość CPTU; gleby pośrednie; ściśliwość; siła

EN

CPTU quality; intermediate soils; compressibility; strength

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2020
• Tom: Vol. 68, Nr 8
• Strony: 655--662
• Opis fizyczny: Bibliogr. 18 poz., rys., tab., wykr.

Twórcy

autor

Wierzbicki Jędrzej

• Instytut Geologii, Wydział Nauk Geograficznych i Geologicznych, Uniwersytet im. Adama Mickiewicza w Poznaniu, ul. Bogumiła Krygowskiego 12, 60-680 Poznań

autor

Młynarek Zbigniew

• Uniwersytet Przyrodniczy w Poznaniu, ul. Wojska Polskiego 28, 60-637 Poznań

autor

Wołyński Waldemar

• Wydział Matematyki i Informatyki, Uniwersytet im. Adama Mickiewicza w Poznaniu, ul. Umultowska 87, 61-614 Poznań

Bibliografia

• 1. DEJONG J.T., JAEGER R.A., BOULANGER R.W., RANDOLPH M., WAHL D. A. J. 2013 - Variable penetration rate cone testing for characterization of intermediate soils. [W:] Coutinho R.Q., Mayne P.W. (eds.), Geotechnical and Geophysical Site Characterization 4 (Proceedings ISC-4: the fourth international conference on site characterization). CRC Press: 25-42.
• 2. ISO 2012 - Geotechnical investigation and testing Field testing - Part 1: Electrical cone and piezocone penetration test (ISO 22476-1).
• 3. ISSMGE 1999 - Test Procedures for Cone Penetration (CPT) and Cone Penetration with Pore Pressure (CPTU). International Society for Soil Mechanics and Geotechnical Engineering Technical Committee TC-16.
• 4. LACASSE S., NADIM F. 1994 - Reliability issues and future challenges in geotechnical engineering for offshore structures, Cambridge Mass. LUMB P. 1974 - Applications of Statistics in Soil Mechanics. [W:] Lee J. K. (red.), Soil Mechanics-New Horizons. Newness-Batterworth, London.
• 5. LUNNE T., LONG M., FORSBERG C.F. 2003 - Characterisation and engineering properties of Onsoy clay. [W:] Characterisation and engineering properies of natural soils. A A Balkema, British Library Conference Proceedings: 395-428.
• 6. LUNNE T., ROBERTSON P.K., POWELL J.J.M. 1997 - Cone penetration testing in geotechnical practice. Taylor & Francis, London.
• 7. MŁYNAREK Z. 2010 - Quality of in situ and laboratory tests contribution to risk management. 14th Danube-European Conference on Geotechnical Engineering, Bratislava.
• 8. MŁYNAREK Z., WIERZBICKI J., LUNNE T. 2016 - On the influence of overconsolidation effect on the compressibility assessment of subsoil by means of CPTU and DMT. Annals of Warsaw University of Life Sciences - SGGW Land Reclamation, 48 (3): 189-200.
• 9. MŁYNAREK Z., WOŁYŃSKI W., KROLL M. 2002 - Statistical evaluation of differences between the CPTU parameters obtained from tests with various penetrometers. Norwegian Geotechnical Institute.
• 10. RADASZEWSKI R., STEFANIAK K. 2017 - Problem wyznaczania wytrzymałości na ścinanie gruntów przejściowych. Prz. Geol., 65 (10/2): 864-872.
• 11. RADASZEWSKI R., WIERZBICKI J. 2019 - Characterization and engineering properties of AMU Morasko soft clay. AIMS Geosc., 5 (2): 235-264.
• 12. ROBERTSON P.K. 2009 - Interpretation of cone penetration tests - a unified approach. Canadian Geotech. J., 46: 1337-1355.
• 13. ROBERTSON P.K. 2010 - Estimating in situ soil permeability from CPT & CPTu. 2nd International Symposium on Cone Penetration Testing, Huntington Beach, CA, USA.
• 14. SEBER G.A.F. 1989 - Mulitcariate observations. John Wiley&Sons, New York.
• 15. STANKOWSKI W. 2008 - Morasko Meteorite. A curiosity of the Poznań region. Wyd. Nauk. UAM Poznań, Poland.
• 16. UZIELLI M. 2008 - Statistical analysis of geotechnical data. [W:] Huang A.B., Mayne P.W. (red.), Geotechnical and Geophysical Site Characterization. Leiden, Taylor & Francis: 173-193.
• 17. WIERZBICKI J., RADASZEWSKI R., WALIŃSKI M. 2018 - The variability of CPTU results on the AMU-Morasko soft clay test site. [W:] Hicks M.A., Pisano F., Peuchen J. (red.). Cone Penetration Testing 2018. London, Taylor and Francis Group.: 703-708.
• 18. WINTER B.J., BROWN D.R., MICHELS J.K.M. 1999 - Statistical principals in experimental design. Mc Grow-Hill, New York.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).