Open AccessExperimental Studies on Thermo-mechanical Coupled Behavior of Pile-Clay Interface
Author(s) -
Jingkai Wang,
Zhichao Zhang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/455/1/012113
Subject(s) - consolidation (business) , pile , materials science , geotechnical engineering , shear (geology) , shear stress , thermal , composite material , geology , thermodynamics , physics , accounting , business
The thermo-mechanical coupled behavior of pile-soil interface is very important for the mechanical performance of energy pile. It is studied in this paper by the thermo-mechanical coupled direct shear tests with a temperature controllable concrete specimen in the top shear box and a Kaolin clay specimen in the bottom shear box. The results show that the strength of pile-clay interface significantly depends on the temperature, the temperature cycle number and the over-consolidation ratios of clay. With the heating-cooling cycles, the interface strength can increase and decrease monotonically or non-monotonically depending on the stress state and history of clay, which is generally a thermo-elasto-plastic process. It is shown that the thermo-mechanical coupled pile-clay interface behavior is the net effect of the pore water transportation and the rearrangement of clay particles near the interface as well as the thermal consolidation/expansion of clay.