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w dniu 4 listopada o godzinie 14.00 w trybie zdalnym na platformie ZOOM.us, w ramach cyklu wykładów organizowanych we współpracy z Uniwersytetem Auburn, Alabama, USA, odbędzie się wykład Pani prof. Joanny Bzówki, Pana dr Macieja Ochmańskiego z Politechniki Śląskiej w Gliwicach (Katedra Geotechniki i Dróg, Wydział Budownictwa) oraz Pana prof. Giuseppe Modoniego z University of Cassino and Southern Lazio, Cassino, Italy. Poniżej szczegółowe informacje na temat zakresu poruszanej tematyki i prelegentów. Planowany czas wystąpienia: 45 min. + ok. 15 min. dyskusji.

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3D Numerical simulation of consolidation induced in soft ground by EPB technology and lining defects

by Prof. Joanna Bzówka, PhD, DSc, Eng.
Dr Maciej Ochmański, PhD, Eng.
Prof. Giuseppe Modoni, PhD, Eng. *)

Faculty of Civil Engineering / Department of Geotechnics and Roads
Silesian University of Technology (SUT), Gliwice, Poland
*) Department of Civil and Mechanical Engineering,
University of Cassino and Southern Lazio (UNICAS), Cassino, Italy

Summary:
Presented work analyses with a sophisticated numerical model the long-term phenomenology induced by Earth Pressure Balance tunnelling in compressible, low permeability soils. The complex soil-structure interaction determined by the EPB technology is analyzed with a three -dimensional model that closely reproduces the sequence of face pressurization, excavation, lining installation and tail grout injection and simulates the hydromechanical soil coupled response with a non-linear, irreversible, anisotropic hypoplastic model. After validation on a documented case study taken from literature, the model has been applied to a real example, MRTA Project in Bangkok. The study reveals that short and long-term settlements induced by tunnelling cannot be decoupled, being both governed by the fluid-soil-lining interaction and resulting from the time dependent stress transfer among the different elements. In this scenario over pressurizing face and tail void reduces the immediate soil relaxation at the expenses of increasing the long-term settlements. Local or global defects have then been hypothesized on the lining waterproofness considering different initial groundwater conditions, soil permeability models and sets of EPB operative parameters. While concentrated lining defects play a negligible role, extensive imperfection noticeably increases settlements, volume loss and bending moments on the lining, with the same function of the relative soil-lining permeability.

Bio-notes:

	Joanna Bzówka is a professor, the Head of Department of Geotechnics and Roads and the Dean of the Faculty of Civil Engineering of the Silesian University of Technology in Gliwice, Poland. She received her PhD degree in 2002 and her DSc degree in 2009. Her area of scientific and research interests includes: geotechnics, soil mechanics, geoengineering, ground improvement techniques, analyses of soil-structure interaction. Under her supervision seven PhD theses on geotechnical and road engineering were prepared and finalised.
	Maciej Ochmański is an Assistant Professor at the Department of Geotechnics and Roads of the Silesian University of Technology, Gliwice, Poland. Currently, he works also as a PostDoc at the Charles University in Prague (Czech Republic). In 2017 he received a double PhD degree in Civil Engineering at Silesian University of Technology (Poland) and University of Cassino (Italy). His research activity is focused on solving complex static and dynamic soil mechanics problems using novel numerical approaches. He has wide experience in numerical modelling of various complex geotechnical problems, e.g. tunnelling and deep excavation structures, off-shore wind turbines foundations subjected to monotonic and cyclic loading or computational fluid dynamics simulations for jet grouting. Currently, as a PostDoc in international (Czech Republic – China) research project he is involved in developing of new implicit & explicit constitutive models for soils dynamic response, such as High Cycle Accumulation (HCA) models, and numerical simulations of off-shore wind turbine structures subjected to extreme environmental loadings.
	Giuseppe Modoni is a profesor at the Department of Civil and Mechanical Engineering of the University of Cassino and Southern Lazio, Cassino, Italy. He graduated in Civil Engineering at the University of Napoli, Federico II, in 1994. He completed a PhD in Geotechnical Engineering from the Consortium of the Universities of Rome and Napoli in 1999. He has been awarded with fellowships from the Japan Society for the Promotion of Science (2004) and the Silesian University of Technology in Poland (2006-2008). He is a Member of the Italian Geotechnical Society (Associazione Geotecnica Italiana – AGI) and has participated to the AGI Committee for preparing the Recommendation on Jet Grouting. His research activity spans from laboratory investigation and theoretical modelling of the stress strain response of coarse-grained materials, design of jet grouting, interpretation and modelling of large scale geotechnical problems. He has authored several papers in geotechnical journals and conferences and is reviewer for prestigious international journals. He has published two books on Jet Grouting, one in Italian published by Hevelius (2005), the other in English published by Taylor and Francis (2014). He has about 20 years of geotechnical consultant experience in Italy and Europe.