Laboratory-scale thermo-activated piles under long continuous operation and different mobilised shaft resistance

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-09-17 DOI:10.1007/s11440-024-02397-7
Luis Villegas, Amin Rafiei, Guillermo A. Narsilio, Chanakya Arya, Raul Fuentes
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Abstract

This paper examines the shaft resistance mobilisation ratio as a predictor of cumulative displacement of small-scale floating and end-bearing energy pile foundations subjected to vertical compressive loads embedded in dry sandy soils. A reduced friction model pile was subjected to different mechanical loads and two long-duration, cyclic heating/recovery temperature changes. The pile, soil and container temperatures, pile strains, and vertical displacements are monitored, analysed, and discussed. The results further validate numerical analyses that propose the shaft resistance mobilisation ratio as a variable to identify thresholds above which permanent cyclic thermo-induced deformations may occur. Overall, the experimentally observed responses indicate incremental deformations as the shaft resistance mobilisation ratio increased. The results also suggest that a mobilisation ratio of 66% could be a potential conservative lower-bound limit that could control the increment of thermal-induced vertical displacements in the long term under free pile head conditions. This suggests that a performance-based design would be a reasonable approach for energy piles, and monitoring programs should be set in the field before loading and thermo-activation.

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实验室规模的热激活桩在长时间连续运行和不同移动轴阻力条件下的情况
本文研究了轴阻力动用率作为小型浮动和端承能量桩地基在垂直压缩荷载作用下嵌入干燥砂土中的累积位移的预测指标。一根减摩模型桩承受了不同的机械荷载和两次长时间的循环加热/恢复温度变化。对桩体、土壤和容器的温度、桩体应变和垂直位移进行了监测、分析和讨论。结果进一步验证了数值分析,该分析建议将轴阻力动员率作为一个变量,以确定超过可能发生永久性循环热诱导变形的阈值。总体而言,实验观察到的响应表明,随着轴阻力动员率的增加,变形也在增加。结果还表明,66% 的动员率可能是一个潜在的保守下限,可以在自由桩头条件下长期控制热诱导垂直位移的增量。这表明,基于性能的设计将是能源桩的合理方法,在加载和热激活之前,应在现场制定监测计划。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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