BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Multi-Hazard Modelling of Dual Row Retaining Walls  - Dr Srikanth 
 Madabhushi\, UC Davis
DTSTART:20190404T150000Z
DTEND:20190404T160000Z
UID:TALK121576@talks.cam.ac.uk
CONTACT:Magdalena Charytoniuk
DESCRIPTION:The recent 2011 Tohoku earthquake and tsunami served as a star
 k reminder of the destructive capabilities of multi-hazard events. Whilst 
 Civil Engineers must design robust protective measures\, their deployment 
 over long stretches of coastline necessitates an economical and environmen
 tally friendly design. The dual row retaining wall concept - which feature
 s two parallel sheet pile walls with a sand infill between them and tie ro
 ds connecting the wall heads - is potentially an efficient and resilient s
 ystem in the face of both earthquake and tsunami loading. \nThis research 
 seminar will cover the centrifuge modelling and numerical analyses that we
 re conducted to investigate the potential of the dual row wall systems. St
 udying the mechanics of the walls in dry sand from the soil stresses to th
 e system displacements revealed the complex nature of the soil structure i
 nteraction. Recognising the dynamically varying vertical effective stresse
 s promotes a purer understanding of the earth pressures mobilised around t
 he walls and may encourage a move away from historically used dynamic eart
 h pressure coefficients.  In a similar vein\, the proposed modified Winkle
 r method can form the basis of an efficient preliminary design tool for pr
 actice with a reduced disconnect between the wall movements and mobilised 
 soil stresses.\nWhen founded in liquefiable soil and subjected to harmonic
  base motion\, the dual row walls were resilient to catastrophic collapse 
 and only accrued deformation in a ratcheting fashion. The experiments and 
 numerical simulations highlighted the importance of relative suction betwe
 en the walls\, shear-induced dilation and regained strength outside the wa
 lls\, and partial drainage in the co-seismic period. The use of surrogate 
 modelling to automatically optimise parameter selection for the advanced c
 onstitutive model was successfully explored. Ultimately\, focussing on the
  mechanics of the dual row walls has helped further the academic and pract
 ical understanding of these complex but life-saving systems.
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
END:VEVENT
END:VCALENDAR