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SUMMARY:Installation effects due to pile jacking in sand - Francesca Bural
 i d'Arezzo\, CUED
DTSTART:20141023T150000Z
DTEND:20141023T160000Z
UID:TALK54235@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Piles have been used for thousand years as foundations for hum
 an dwellings and they are nowadays still used with the same scope. Piles c
 an be either driven or cast in-situ\, the choice of one installation metho
 d relative to the other depends largely on the characteristics of the soil
  on site and nonetheless on urban and environmental conditions such as the
  presence of nearby buildings and houses.\nThe installation methodology af
 fects costs and times involved in the project as well as the pile behaviou
 r during subsequent loading. Amongst those\, the jacking technique is beco
 ming a standard for installing driven piles\, in particular in urban areas
  due to the low noise and vibrations involved in the procedure. Jacked pil
 es are pushed into the ground by a static force mobilised against the reac
 tion force of previously installed piles. \nA series of centrifuge and cal
 ibration chamber testing has been performed in order to assess the stress 
 field around jacked piles during and after the installation. A particular 
 jacking technique\, called surging\, was also investigated in order to red
 uce the shaft load experienced by the pile during jacking. It is believed 
 that the method can reduce effectively the installation loads of open-ende
 d piles installed in hard grounds. \nFinally\, a new technique for stress 
 measurement is presented. A new type of stress sensors was developed at th
 e Technion University in Israel and implemented in the geotechnical centri
 fuge in Cambridge.  Results show that measurements taken by these new sens
 ors are not affected by soil type\, density\, soil stiffness and previous 
 stress history.\n
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
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