A simple method for analyzing thermomechanical response of an energy pile in a group. (December 2022)

• Record Type: Journal Article
• Authors: Liu, Shan-wei; Zhang, Qian-qing; Cui, Wei; Liu, Gui-hai; Liu, Jing-hang
• Is Part Of: Geomechanics for energy and the environment. Volume 32(2022)
• Publication Date: 2022-12
• Subjects: Energy pile -- Thermomechanical response -- Pyke criterion -- Pile interaction -- Exponential model; Engineering geology -- Periodicals; Power resources -- Periodicals; Energy development -- Technological innovations -- Periodicals; Engineering geology -- Environmental aspects -- Periodicals; Energy development -- Technological innovations; Engineering geology; Engineering geology -- Environmental aspects; Power resources; Geology -- Periodicals; Energy-Generating Resources -- Periodicals; Periodicals; Electronic journals; 621.042
• DOI: 10.1016/j.gete.2022.100309
• Languages: English
• ISSNs: 2352-3808

Abstract

Abstract: This study develops a simple method for rapid estimation of the thermomechanical response of an energy pile in a group. Based on the equilibrium condition of the force, the governing equations for a single energy pile are established using the finite difference method. An exponential model is used to describe the relationship between the unit skin friction and pile–soil relative displacement as well as the relationship between the unit end resistance and displacement at the pile end. Based on the Pyke model for the loading–unloading behavior of the pile–soil interface, the incremental relationship between the unit skin friction and pile shaft displacement, and the incremental relationship between the unit base resistance and pile end displacement, are presented in the unloading and reverse loading stages. Considering the mechanical and thermal loads and the reinforcing effect of neighboring piles, a simple method is proposed to analyze the thermomechanical response of an individual energy pile in a group. Comparisons between the measured and computed results of six well-documented cases are presented to verify the reliability of the proposed method. Highlights: The governing equation of a single energy pile is formulated by using the finite difference method. Pyke model is used to describe the loading and unloading process of surrounding soil. The reinforcing effect of neighboring piles is considered in the proposed method.