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SUMMARY:Measuring soil pressure:  An application for determining Ko of gra
 nular soils - Mark L Talesnick\, Associate Professor\, Faculty of Civil an
 d Environmental Engineering\, Technion\, Israel Institute of Technology\, 
 Haifa
DTSTART:20110225T160000Z
DTEND:20110225T173000Z
UID:TALK29587@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:The talk presents the methodologies and results of experimenta
 l studies aimed at measuring soil pressure at a structural boundary as it 
 interacts with the surrounding soil under load\, and soil pressure which d
 evelops within a particulate/soil medium.  \n\nThe studies have been carri
 ed out using a newly designed and constructed soil pressure cell which is 
 based on the null concept.  The measurement system is based on active sens
 ing technology.  The response of the device is unaffected by the parameter
 s which plague traditional soil pressure cells.  Response is unaffected by
  soil stiffness\, stress history\, particle size and soil type.  In fact c
 alibration of the system is not required.\n\nAn in-soil version of the nul
 l soil pressure measurement system has been used in the measurement of lat
 eral earth pressures of granular soils for at rest earth conditions.  Four
  uniformly graded soils were tested\; from a fine dune sand of particle di
 ameter 0.15mm\, through a crushed stone gravel\, of particle size\, 12-15m
 m.\n\nTwo significant observations are made and discussed based upon the d
 ata presented. \n \n• For initial loading\, the coefficient of lateral e
 arth pressure\, Ko\, was found to be higher for soil placed in dense condi
 tions in comparison to that measured for the same soil placed in loose con
 ditions.  This observation was seen in the case of all soils tested.\n\n
 • The development of horizontal pressure during unloading and reloading 
 was found to be very similar to that of initial loading.  Relatively littl
 e hysteresis was noted with only limited variation between different soils
 .\n
LOCATION:Engineering Department - Lecture Room 6
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