Study of temperature-controlled pile-red clay interface tests and#br#
stress-strain relationship
Li Chunhong1 Kong Gangqiang1 Liu Hanlong1,2 Xiao Yang2
1. Key Laboratory of Geomechanics and Embankment Engineering of the Ministry of Education, Hohai University, Nanjing 210024, China;
2.Chongqing University, Chongqing 400045, China
Abstract：The mechanical properties of pile-soil interface have important influence on the design and calculation of bearing capacity of energy piles. However, there are relatively few studies on the mechanical properties of pile-soil interface considering the influence of temperature. The remodeling red clay from Chongqing was used to conduct the temperature-controlled direct shear test to study the mechanical properties of pile-soil interface. The results of the interface tests were compared with that of soil as well. Based on the potential energy dissipation principle, two temperature factors ?1、 ?2 were concluded to established the pile-soil interface model considering temperature effects. The accuracy and reliability of the new model were verified trough the comparison of the simulation results with the measured data. The results show that the shear strength of pile-red clay interface increases slightly with temperature in this test. The new model of pile-red clay interface considering temperature effects can simulate the stress-strain curves under different normal loadings, and to a certain extent the temperature influence on the interface mechanical properties can be reflected.
