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SUMMARY:An experimental and theoretical investigation into the small strai
 n stiffness of clays - Angelo Amorosi\, Associate Professor in Geotechnica
 l Engineering\, Technical University of Bari\, Italy
DTSTART:20150313T160000Z
DTEND:20150313T173000Z
UID:TALK58295@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:The talk will focus on recently observed experimental results 
 on the small strain stiffness of clayey soils and their interpretation in 
 light of a new class of hyperelastic laws.\nMore in detail\, the seminar w
 ill include an introduction aimed at highlighting the role of elasticity i
 n modern soil mechanics\, followed by the description of the adopted exper
 imental techniques\, mainly consisting of piezoelectric transducers (bende
 r elements) installed in stress-controlled triaxial systems\, to detect th
 e dependence of Ghv and Ghh on state and internal variables.\n\nThe second
  part of the talk will initially be devoted to the inconsistencies and lim
 itations of the constitutive assumptions usually adopted to describe the r
 eversible behaviour of soils\, as such justifying the effort put in develo
 ping new\, more theoretically sound\, formulations based on hyperelasticit
 y. A review of some recently proposed isotropic and anisotropic formulatio
 ns will be proposed and their predictive capabilities will be evaluated wi
 th reference to the above experimental results. Ongoing and future researc
 h work will finally be addressed\, leading to some more general conclusion
 s.\n\nRelated references:\nRAMPELLO\, S.\, VIGGIANI\, G.M.B.\, AMOROSI\, A
 . (1997)\, ‘Small-strain stiffness of reconstituted clay compressed alon
 g constant triaxial stress ratio paths’\, Géotechnique 47 (3)\, 475-489
 .\nBORJA\, R.I.\, TAMAGNINI\, C.\, AMOROSI\, A. (1997)\, ‘Coupling plast
 icity and energy-conserving elasticity models for clays’\, ASCE\, Journa
 l of the Geotechnical and Geoenviromental Engineering Division 123 (10)\, 
 948-957.\nHOULSBY\, G.T.\, AMOROSI\, A.\, ROJAS\, E. (2005)\, ‘Elastic m
 oduli of soils dependent on pressure: a hyperelastic formulation’\, Géo
 technique 55 (5)\, 383-392.\nMITARITONNA\, G.\, AMOROSI\, A.\, COTECCHIA\,
  F. (2014)\, ‘Experimental investigation of the evolution of elastic sti
 ffness anisotropy in a clayey soil’\, Géotechnique\, 64 (6)\, 1-13.\n\n
 Short CV:\nAngelo Amorosi is associate professor of geotechnical engineeri
 ng at the engineering faculty of the Technical University of Bari\, Italy\
 , where he started working as a lecturer in 1999.\nHe graduated in Civil E
 ngineering at the University of Roma “La Sapianza” in 1992\, where he 
 then obtained his PhD in geotechnical engineering in the Structural and Ge
 otechnical Engineering Department under the supervision of Prof. Giovanni 
 Calabresi.\nDuring and after his PhD Dr. Amorosi spent some periods abroad
 \, working at City University of London\, Technical University of Athens a
 nd at the Department of Engineering Science of Oxford University.\nHis res
 earch interests include experimental observations and mathematical modelli
 ng of the mechanical behaviour of clayey soils\, development of numerical 
 integration schemes for plasticity based constitutive laws\, numerical sim
 ulation of various boundary value problems\, under both static and dynamic
  conditions\, with particular emphasis on natural and artificial slopes\, 
 earth dams and tunnels and masonry structures.\nHe has been member of the 
 editorial board of Geotechnique and of the Italian Geotechnical Journal an
 d serves as reviewer for a number of international journals in geotechnics
  and mechanics. \nHe currently teaches Foundation Engineering\, Soil Mecha
 nics and Soil Dynamics at the Technical University of Bari.\n
LOCATION: Cambridge University Engineering Department\, Lecture Room 3
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