Abstract
An inhomogeneous temperature field was built in an experimental model of sand with an embedded pile. The temperature of the soil, as well as the temperature and strain on opposite sides of the pile were investigated in the process of temperature balance. The effect of the inhomogeneous temperature field on the internal force of the pile was analyzed. The experimental results show that the inhomogeneous temperature field will cause a bending deformation in the pile body according to the FBG (fiber Bragg grating) strain sensors. The distribution of the bending moment along the length of the pile is related to the temperature difference. The maximum bending moments reached −25.7 N·m when the temperature difference was about 1.3 °C. Therefore, the influence of the inhomogeneous temperature field o· the internal force of the foundation pile should be taken into account in the applications of a ground source heat pump system.
Highlights
For the environmentally-friendly, energy efficient, and renewable advantages, the exploitation and utilization of shallow geothermal energy has aroused a great deal of attention
Lu et al have conducted load-temperature joint tests on a kind of friction energy pile [16], and the results showed that the distribution of the axial force and additional temperature stress are related to the load on the pile head and the constraint condition
In order to investigate the effects of the inhomogeneous temperature on the internal forces, a laboratory study was conducted on a small-sized model pile, which was installed in an experimental chamber filled with sand
Summary
For the environmentally-friendly, energy efficient, and renewable advantages, the exploitation and utilization of shallow geothermal energy has aroused a great deal of attention. There has been a new utilization approach with respect to shallow geothermal energy which attempts to install heat exchange tubes in a pile foundation, which are called energy/thermal piles. Lu et al have conducted load-temperature joint tests on a kind of friction energy pile [16], and the results showed that the distribution of the axial force and additional temperature stress are related to the load on the pile head and the constraint condition. The internal forces of the underground structure, such as the bending moment, will change because of the inhomogeneous temperature field. In order to investigate the effects of the inhomogeneous temperature on the internal forces, a laboratory study was conducted on a small-sized model pile, which was installed in an experimental chamber filled with sand. The bending moment along the length of the pile was calculated according to the FBG strain sensors
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