Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S1): 117-126.doi: 10.16285/j.rsm.2020.1525

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Test and analysis of bearing characteristics of energy pile based on BOTDR

GAO Lei1, HAN Chuan1, HUANG Jian2, WANG Yang2, ZHOU Le1   

  1. 1. Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing, Jiangsu 210024, China; 2. Shanghai Geological and Mining Engineering Survey Institute, Shanghai 200072, China
  • Received:2020-10-14 Revised:2022-02-14 Online:2022-06-30 Published:2022-07-13
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51508159) and the Fundamental Research Funds for the Central Universities (2019B12914).

Abstract: The energy pile is a combination of load bearing and heat exchange. It bears the combined action of load and temperature. The bearing capacity of energy pile is very complex. Based on the energy pile engineering in Shanghai, the Brillouin optical time-domain reflectometry (BOTDR) distributed optical fiber sensing technology is used to monitor the axial force and temperature of energy pile. The axial force and side friction distribution curve of pile are obtained under the load, temperature and under the joint action of load and temperature. The bearing characteristics and load transfer characteristics of energy pile under load and temperature are analyzed. The results show that the bearing behavior of energy pile is different from the ordinary cast-in-place pile. The increase of pile temperature will cause pile deformation, and the axial force of pile will produce under the constraint of soil, which is basically linear with the change of pile temperature. Under the combined action of load and temperature, the axial force of pile is much larger than that under the action of a single factor, and the increment of axial force caused by the combined action of load and temperature can reach two times or more that of under the action of load alone. At the same time, the side negative friction of pile will be generated in a large range due to the influence of temperature rising, but the load action can obviously alleviate the generation of negative friction.

Key words: energy pile, joint action of load and temperature, BOTDR distributed optical fiber monitoring, temperature, axial force, negative friction

CLC Number: 

  • TU473
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