Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (12): 4857-4864.doi: 10.16285/j.rsm.2018.1610

• Geotechnical Engineering • Previous Articles     Next Articles

Study of soil comprehensive thermal conductivity coefficient based on field test of energy pile

REN Lian-wei1, KONG Gang-qiang2, HAO Yao-hu2, LIU Han-long2, 3   

  1. 1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China; 2. Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 3. College of Civil Engineering, Chongqing University, Chongqing, 400045, China
  • Received:2018-09-02 Online:2019-12-11 Published:2020-01-04
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51778212, U1810203).

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Abstract: Energy pile is an energy-saving and emission-reduction technology, combining the functions of structure load supporter and shallow geothermal heat exchanger. There has been application in the world in recent years. Normally, the comprehensive thermal conductivity coefficient of soil is measured through ground source heat pump technique. However, this value is unsuitable to calculate the heat exchange efficiency of energy pile accurately. Field tests and numerical simulations on the soil thermal conductivity coefficient were obtained in energy pile group with low cap located on Henan Polytechnic University. The influence of heating time, heating power, flow rate, pile length and the arrangement of energy pile in groups on the soil comprehensive thermal conductivity coefficient are analyzed. It shows that the line heat source analysis method, based on the ground source heat pump testing, is unsuitable for the calculation of soil comprehensive thermal conductivity coefficient . Hence, it is necessary to develop one testing and analyzing method which can considering pile diameter, etc.

Key words: energy pile, comprehensive thermal conductivity coefficient, field test, numerical simulation

CLC Number: 

  • TU 473
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