Abstract
A new simplified method is proposed to estimate the zero point of displacement variation, assuming that the pile shaft and end resistance are in the elastic stage. The additional pile axial force was calculated by using the proposed method. The temperature distribution among surrounding soils was estimated by using the finite-line-source model. The temperature distribution obtained by the proposed method was compared with that obtained by the finite-element model, and a good agreement was obtained. A method for estimating the interaction caused by heating between energy piles is proposed, and a comparison between the calculated results obtained by the proposed method and those obtained using Abaqus software on energy piles was done to verify the accuracy of the proposed method. It is shown that reasonable predictions about interaction between energy piles can be made without expensive and time-consuming analyses by means of the method proposed in this paper.
Highlights
In recent years, energy piles have been used increasingly due to their economic benefit and environment-friendly advantage
The position of the zero point has no obvious relationship to the temperature change in the pile body
■ A simplified method for calculating the additional pile axial force caused by heating is proposed
Summary
Energy piles have been used increasingly due to their economic benefit and environment-friendly advantage. Laboratory tests were carried out to examine the heat-transfer performance and bearing characteristics of energy piles (Kong et al, 2017; Wang et al, 2016), and the conclusion was that the heating–cooling cycle could lead to thermal strain and that stress in the pile shaft could occur. When the pile–soil relative displacement reaches the value su[1], the shear stress at the interface between the pile side and surrounding soils changes This relationship can be expressed in the following equation. The zero point of displacement change can be obtained by using the following equation
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