Long-term responses of energy piles based on exponential model

被引：0
作者：
Dong L. [1 ]
Wu W. [1 ,2 ]
Liang R. [1 ,2 ]
Liu H. [1 ,2 ]
Mei G. [1 ,2 ]
Yang Z. [1 ]
机构：
[1] Faculty of Engineering, China University of Geosciences, Wuhan
[2] Key Laboratory of Disaster Prevention and Structural Safety, Ministry of Education, Guangxi University, Nanning
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2021年 / 40卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Cyclic loading and unloading; Energy pile; Exponential model; Load transfer approach; Long-term response; Pile foundation;
D O I：
10.13722/j.cnki.jrme.2020.0588
中图分类号：
学科分类号：
摘要：
Adopting the load transfer method, this paper presents an analysis method for the long-term responses of energy piles based on exponential model. Firstly, the improved Masing criterion is introduced to construct a loading and unloading function of soil taking the exponential function model as the backbone curve, and the working characteristics of energy piles during the temperature cycle are investigated based on the load transfer method. Then, the rationality of the theoretical model is verified by comparison with field test data. Finally, the long-term working characteristics of the energy pile are studied with two examples. The results show that the temperature cycling mode has an important influence on the additional settlement of the pile top, and that, compared with the energy pile only used for refrigeration, the settlement of the pile top under the cold and hot cycling condition is more obvious. The larger the stiffness coefficient of the pile top, the smaller the settlement of the pile top and the faster the stability. When the superstructure load is small, the tensile stress may be generated in the lower part of the pile during the temperature cycle;while the upper load is large, the settlement of the pile top increases with increasing the pile temperature cycle number and the settlement stability time gradually increases. © 2021, Science Press. All right reserved.
引用
收藏
页码：629 / 639
页数：10
相关论文
共 24 条
  • [1] GUI Shuqiang, CHENG Xiaohui, In-situ tests on structural responses of energy piles during heat exchanging process, Chinese Journal of Geotechnical Engineering, 36, 6, pp. 1087-1094, (2014)
  • [2] LALOUI L, NUTH M, VULLIET L., Experimental and numerical investigations of the behaviour of a heat exchanger pile, International Journal for Numerical and Analytical Methods in Geomechanics, 30, 8, pp. 763-781, (2006)
  • [3] GOODE J C I, MCCARTNEY J S., Centrifuge modeling of endrestraint effects in energy foundations, Journal of Geotechnical and Geoenvironmental Engineering, 141, 8, (2015)
  • [4] WANG B, BOUAZZA A, HABERFIELD C., Preliminary observations from laboratory scale model geothermal pile subjected to thermalmechanical loading, Proceedings of the Geo-frontiers Congress, pp. 430-439, (2011)
  • [5] LIU Hanlong, WANG Chenglong, KONG Gangqiang, Et al., Thermal-mechanical characteristics of energy pile under different degree of compaction, China Sciencepaper, 11, 13, pp. 1511-1515, (2016)
  • [6] KONG Gangqiang, WANG Chenglong, LIU Hanlong, Et al., Analysis of pile head displacement of energy pile under repeated temperature cycling, Rock and Soil Mechanics, 38, 4, pp. 958-964, (2017)
  • [7] LORIA A F R, GUNAWAN A, SHI C, Et al., Numerical modelling of energy piles in saturated sand subjected to thermo-mechanical loads, Geomechanics for Energy and the Environment, 1, 1, pp. 1-15, (2015)
  • [8] HAO Yaohu, KONG Gangqiang, PENG Huaifeng, Et al., Analysis of thermo-mechanical behavior of single pile influenced by pile tip constraint, Journal of Disaster Prevention and Mitigation Engineering, 37, 4, pp. 532-539, (2017)
  • [9] HUANG Yinpei, JIANG Gang, LU Hongwei, Et al., Thermomechanical coupling load transfer method of energy pile based on exponential model, Journal of Nanjing University of Technology: Natural Science, 41, 1, pp. 96-103, (2019)
  • [10] KNELLWOLF C, PERON H, LALOUI L., Geotechnical analysis of heat exchanger Piles, Journal of Geotechnical and Geoenvironmental Engineering, 137, 10, pp. 890-902, (2011)
123