BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:Deformation and stress based approaches to the problems of embankm ent design on soft soils DTSTART:20161111T121500 DTEND:20161111T131500 DTSTAMP:20260916T050038Z UID:8c2e80529c3143dff2143d592c18896e018cbb32c8f07aaf118726a5 CATEGORIES:Conferences - Seminars DESCRIPTION:S. Feyza Cinicioglu\, Professor at Istanbul University\, Civil Engineering Department\, Istanbul\, Turkey\nDesign and construction of em bankments on soft clays are associated with a number of problems which sho w themselves as excessive deformations or catastrophic failures. Tradition ally\, design and construction are considered as separate processes and th ere is a strong desire for certainty of cost and outcome at the design sta ge before construction starts. However\, it is not usually possible to mee t these requirements due to unforeseen conditions during field investigati on process and design stage. An improved version of observational method c an be made use of as the only available technique to overcome the difficul ties related to the prediction of soil behaviour.  The method uses field measurements as the direct inputs to the framework of the constitutive beh avior and analyses the behavior synchronously as measurements are recorded . As a result\, it is possible to work with current parameters and time la gs between capture of measurements\, their interpretation leading to param eter revision and corresponding design adjustments are prevented.  The fr amework provided for the application of the method is basically the ideali zed stress space of the Critical State Theory\, but the constitutive aniso tropic elastoplastic soil model is mounted on it to analyze the behavior a nd to provide direct links between measurements and design parameters. Str ain rate dependency of the soft soils is also incorporated to the interpre tation of the behavior. To consider the variation in the behavior of found ation soils\, a zonation system is applied and stress axis rotation is con sidered. The application of the method is a continuous process and the beh aviour can be followed as a real time process throughout the construction and consolidation stages and afterwards. Considerable savings in terms of time and economy can be gained by the application of this method and moreo ver such an application improves the understanding related to the real beh avior of soils. From this viewpoint\, an attempt was also made to solve th e load sharing mechanism between a soil and a pile subjected to soil movem ents from an approach embankment\, by using deformation and stress values obtained from monitoring and applying a continuous process to follow up th e variation in the behavior in a timely manner. The method developed for t his purpose is capable to produce the soil response curves which reflect r eal field behavior through free-field measurements. Load sharing mechanism can be solved realistically with the proposed method for any possible cas e either the piles are constructed before\, during and after embankment co nstruction or for any non-failing or failing state in the responding soil zones. These two methods are real-time methods that discloses the on time behavior during application and enables the implementation of a flexible d esign process. However\, a specific design method that can easily be used in connection with the proposed real time methods could have been useful a nd in this connection a new embankment design method combining limit state approach with stress path application was also developed. This method is applicable for embankments either constructed in a single stage or multipl e stages. Stage construction technique necessitates to add the tool of str ess path application to the method\, to consider both the undrained and dr ained behavior. This is a property that is not found in limit state approa ches and gives to the method a capacity to follow and interpret changing s tress-strain states and their influence on the mobilized strength states. Bio : S. Feyza Cinicioglu received her BSc in civil engineering from Bogaz ici University\, Istanbul in 1974\; M.Eng in civil engineering from Sheffi eld University\, UK in 1976. After working as a professional civil enginee r between the years of 1976-1983\, she joined academia in 1983\, received her Ph.D. in the field of geotechnical engineering in 1986 from Bogazici U niversity\, Istanbul\, Turkey. Since 1995\, she has been working as a full professor of Civil Engineering at Istanbul University. She also served as Head of the Department of Civil Engineering (1998-2013)\, Dean of Graduat e School of Science and Engineering (2004-2005)\, General Secretary (2005- 2011) and meanwhile as the President of the Turkish National Society of So il Mechanics and Geotechnical Engineering (2011- ). Her major areas of res earch are design and construction of embankments on soft clays\, macro and micro soil behavior\, soil-structure interaction and seismic microzonatio n. She has directed several application projects such as\; seismic risk as sessment of Bakirkoy and Omerli Regions of Turkey (these projects have bee n implemented by the municipalities of these regions and they are currentl y effective)\, research projects on the subjects of development of new met hodologies for embankment design and construction on soft clays\, micro an d macro mechanical behavior of soft soils\, behavior of piled bridge abutm ents. Her refereed articles appeared in a variety of journals including AS CE journal of geotechnical and geoenvironmental engineering\, Canadian geo technical journal\, engineering geology\, ASCE international journal of ge omechanics. LOCATION:GCA331 https://plan.epfl.ch/theme/generalite_thm_v2?lang=fr&room= GCA331&dim_floor=3&dim_lang=fr&tree_groups=centres_nevralgiques%2Cacces%2C mobilite_reduite%2Censeignement%2Ccommerces_et_services%2Cvehicules% STATUS:CANCELLED END:VEVENT END:VCALENDAR