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SUMMARY:Terzaghi's fallacy - Professor emeritus Andrew Schofield\, CUED
DTSTART:20130214T160000Z
DTEND:20130214T173000Z
UID:TALK42471@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Terzaghi K. (1936) 'A fundamental fallacy in earth pressure co
 mputations'\, Boston Society of Civil Engineers\, complains that strain do
 es not enter the theory\, and concludes that \n\n'The fundamental assumpti
 ons of Rankine's earth pressure theory are incompatible with the known rel
 ation between stress and strain in soils\, including sand. Therefore the u
 se of this theory should be discontinued'\n\n. Terzaghi also taught that h
 is re search student Hvorslev M. J. (1937) had determined the nature of Co
 ulomb's cohesion in soils and that the plasticity of clay is due to surfac
 e chemistry of clay mineral grains.\n\nHowever the error that Rankine's ma
 de was to adopt Coulomb's soil strength equation. Observed behaviour of so
 il can be explained well by the mechanics of an aggregate of fine solid gr
 ains saturated with an incompressible pore fluid. Indeed if there is a lay
 er of hard grains of powdered ice on Titan's surface\, saturated with and 
 eroded by precipitation and flow of liquid methane\, then the landforms on
  the surface of Titan could be similar to those on Earth\, and the geograp
 hy recognisable.
LOCATION:Engineering Department - Lecture Room 4
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