Comparisons on the Response of Shallow Geothermal Energy Pile Embedded in Soft and Firm Soils

Abstract

Shallow geothermal energy pile, particularly the one used in tropical countries, is a sustainable geostructure system that transforms the soil surrounding the geostructure as a heat sink, for building cooling purposes. Thermal loads stored in the soil will cause thermally induced settlement. A series of laboratory tests were performed to study the behaviour of model energy piles installed in kaolin soil with soft and firm consistencies. Twelve tests which included thermal load tests (35˚C and 40˚C) and thermo-axial load tests (100 N and 200 N, combined with thermal loads) were performed. The pile response to thermal and thermo-axial loads were attributed to the soil consistency and the magnitude of the loads applied to the pile head. Firm soils produce lower thermally induced settlement, due to higher level of restraint compared to soft soils. To ensure that the thermo-axial settlement does not exceed the limiting settlement, the recommended global factor of safety used for soft soil and firm soils subjected to 40˚C thermal load should be more than 4.0 and 2.5, respectively.

Performance-based Design of Energy Pile Foundations

“…In addition to the previous theoretical framework addressing the response of energy piles to mechanical and thermal loads, a substantial amount of experimental knowledge can be considered to comprehensively characterize such foundations as well as to develop analysis and design considerations. Knowledge from full-scale in situ tests (Laloui et al, 2003;Bourne-Webb et al, 2009;McCartney and Murphy, 2012;Wang et al, 2014;Akrouch et al, 2014;Sutman et al, 2015;You et al, 2016;Sutman et al, 2017;Luo et al, 2017;Chen et al, 2017;Allani et al, 2017); McCartney and Murphy (2017), model-scale laboratory tests (Kalantidou et al, 2012;Yavari et al, 2014;Kramer and Basu, 2014;Marto et al, 2015;Yavari et al, 2016b;Nguyen et al, 2017;Liu et al, 2018) and centrifuge tests (Stewart and McCartney, 2014;Ng et al, 2014;Goode and McCartney, 2015;Ng et al, 2015;Ng et al, 2016a) of single energy piles is available. Along with the previous experimental knowledge, theoretical developments including numerical investigations (Laloui et al, 2006;Suryatriyastuti et al, 2012;Olgun et al, 2014;Mimouni and Laloui, 2014;Batini et al, 2015;Rotta Loria et al, 2015;Saggu and Chakraborty, 2015;Bourne-Webb et al, 2016;Gawecka et al, 2016;Ng et al, 2016b;Adinolfi et al, 2018;…”

The Analysis of The Direct Foundation With Energy Foundations On The Basis of The Office Building “A4 Business Park” In Katowice At Francuska Street

“…Recent physical model tests that were carried out by researchers consist of several full-scale testing of shallow geothermal energy piles conducted by [12,19,31,32,33], centrifuge tests conducted by [34,35,36] and laboratory models in single gravity conditions performed by [37,38,39,40]. On the other hand, the energy pile behaviour has also been studied from the numerical analysis perspective, with an apparent focus on soil-structure interaction and overall geotechnical performance of energy piles during its operation [41,42,43,44]. In general, the longterm effect of heating and cooling cycles may adversely affect the performance of energy piles.…”