000202144 001__ 202144
000202144 005__ 20190317000027.0
000202144 0247_ $$2doi$$a10.1680/geolett.14.00063
000202144 02470 $$2ISI$$a000345428200012
000202144 037__ $$aARTICLE
000202144 245__ $$aCentrifuge modelling of energy piles subjected to heating and cooling cycles in clay
000202144 269__ $$a2014
000202144 260__ $$bIce Publishing$$c2014$$aWestminister
000202144 300__ $$a7
000202144 336__ $$aJournal Articles
000202144 520__ $$aEnergy pile foundation can expel and extract heat into and from the ground in summer and winter, respectively. The discharge and extraction of heat induce cyclic thermal load in piles and may lead to serviceability problems. So far, the effects of cyclic heating and cooling on the heave and settlement of energy pile have not been fully understood. In this letter, a new in-flight heating and cooling system developed to control cyclic temperatures of energy pile in centrifuge is described. This system is able to control cyclic temperatures in an energy pile between 3℃ and 90℃. By using this system, two centrifuge energy pile tests were carried out to investigate the effects of cyclic heating and cooling between 9℃ and 38℃ on the long-term displacement of single energy pile in slightly and heavily overconsolidated kaolin clay. Under a constant working load, distinctive ratcheting displacement mechanism was observed for both energy piles during five cycles of heating and cooling. The pile embedded in slightly overconsolidated clay (OCR=1.7) continued to settle but at a reduced rate and reached at 5.7%D (pile diameter). This is believed to be caused by thermally accelerated creep and irreversible contraction of slightly overconsolidated clay. In comparison, a settlement of 3.1%D was observed for pile constructed in heavily overconsolidated clay (OCR=4.7). The observed ratcheting settlements of piles have a clear implication on the serviceability design of energy piles.
000202144 6531_ $$acentrifuge modelling
000202144 6531_ $$aenergy pile
000202144 6531_ $$aratcheting displacement mechanism
000202144 6531_ $$acyclic heating and cooling
000202144 700__ $$aNg, WWC
000202144 700__ $$aShi, C.
000202144 700__ $$aGunawan, A.
000202144 700__ $$0240226$$g105611$$aLaloui, Lyesse
000202144 773__ $$j4$$tGeotechnique letters$$q310-316
000202144 8564_ $$uhttps://infoscience.epfl.ch/record/202144/files/310_tgl14063.pdf$$zn/a$$s4081520$$yn/a
000202144 909C0 $$xU10264$$0252080$$pLMS
000202144 909CO $$qGLOBAL_SET$$particle$$ooai:infoscience.tind.io:202144$$pENAC
000202144 917Z8 $$x105611
000202144 917Z8 $$x105611
000202144 917Z8 $$x105611
000202144 937__ $$aEPFL-ARTICLE-202144
000202144 973__ $$rREVIEWED$$sPUBLISHED$$aOTHER
000202144 980__ $$aARTICLE