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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (3): 562-572    DOI: 10.3785/j.issn.1008-973X.2023.03.014
    
Experimental study on thermo-mechanical properties of geothermal energy pile considering intermittent ratio
Chun-yang LIU1(),Peng-fei FANG2,3,*(),Ri-hong ZHANG4,Xin-yu XIE1,Yang LOU1,Qiu-shan ZHANG2,3,Da-yong ZHU2,3
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. NingboTech University, Ningbo 315100, China
3. Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
4. ZCONE High-Tech Pile Industry Holdings Limited Company, Ningbo 315145, China
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Abstract  

Combined with the field test of geothermal energy pile, the strain/temperature sensors were embedded in the pile body to monitor the inlet/outlet water temperature, the temperature of the pile body and the axial strain. A variation law of the additional axial thermal stress and the additional frictional resistance of the pile under different intermittent ratios was analyzed, the heat transfer performance and thermo-mechanical properties of geothermal energy piles in intermittent and continuous modes were compared. Test results showed that the effect of intermittent ratio on short-term heat transfer performance of geothermal energy piles was greater than that on long-term heat transfer performance.When the intermittent ratio was 1 and 2, The average values of performance coefficient was 3.95 and 4.00, and the average heat transfer per meter of the pile body was 101.2 and 107.3 W/m, respectively. The intermittent ratio had a significant effect on the pile body temperature, and the average temperature increment of the pile body with the intermittent ration of 1 was 66% higher than that with the intermittent ration of 2. The axial observed strain in the middle of the pile body was greater than that at the two ends of the pile, and the additional axial thermal stress and the additional frictional resistance of the pile decreased with the increase of the intermittent ratio. During the recovery stage of pile temperature, the pile temperature, axial observed strain and additional axial thermal stress under intermittent ratio of 1 and 2 were all residual.

Key words： intermittent ratio      geothermal energy pile      multiple temperature cycle      heat transfer performance      thermo-mechanical response      field test     
Received: 06 March 2022      Published: 31 March 2023
CLC:  TU 473  
Fund:  国家自然科学基金资助项目(51708496)；浙江省自然科学基金资助项目(LY16E080010)；宁波市自然科学基金资助项目(2021J169)
Corresponding Authors: Peng-fei FANG     E-mail: 21912192@zju.edu.cn;fpf@nit.zju.edu.cn
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Chun-yang LIU
Peng-fei FANG
Ri-hong ZHANG
Xin-yu XIE
Yang LOU
Qiu-shan ZHANG
Da-yong ZHU
Cite this article:

Chun-yang LIU,Peng-fei FANG,Ri-hong ZHANG,Xin-yu XIE,Yang LOU,Qiu-shan ZHANG,Da-yong ZHU. Experimental study on thermo-mechanical properties of geothermal energy pile considering intermittent ratio. Journal of ZheJiang University (Engineering Science), 2023, 57(3): 562-572.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.03.014     OR     https://www.zjujournals.com/eng/Y2023/V57/I3/562


考虑间歇比的地热能源桩热-力性能试验研究

结合地热能源桩现场试验，在桩身内部埋设应变/温度传感器，监测进/出口水温、桩身温度和轴向应变. 分析不同间歇比下桩身轴向附加温度应力与桩侧附加摩阻力的变化规律，比较间歇与连续模式下地热能源桩的传热性能与热-力学特性. 试验结果表明，间歇比对地热能源桩的短期传热性能影响比长期传热性能影响大. 当间歇比为1、2时，性能系数平均值分别为3.95、4.00，桩身每延米换热量平均值分别为101.2 、107.3 W/m. 间歇比对桩身温度影响较明显，间歇比为1的桩身平均温度增量比间歇比为2的高66%. 桩身中部的轴向观测应变大于桩两端的，桩身轴向附加温度应力和桩侧附加摩阻力均随间歇比的增大而减小. 在桩身温度恢复阶段，间歇比为1、2工况的桩身温度，轴向观测应变和轴向附加温度应力均有残余.


关键词： 间歇比,  地热能源桩,  多次温度循环,  换热性能,  热-力学响应,  现场试验 
土层类型 hs/ m γ/ (kN·m?3) ww/ % λ/ (W·m?1·K?1) c /(J·kg?1·K?1) Es/ MPa c1/ kPa φ/ (°)
淤泥质黏土 0~8 17.2 51.0 1.11 1 840 2.28 10.4 8.3
黏土 8~15 19.0 32.7 1.26 1 670 6.99 37.8 16.9
粉质黏土 15~20 18.8 33.5 1.43 1 620 4.46 24.4 14.2
粉质黏土 20~37 18.7 34.9 1.44 1 620 4.41 19.8 13.3
黏土 37~45 18.3 37.9 1.52 1 730 5.28 24.3 13.3
粉质黏土 45~52 19.1 31.9 1.63 1 620 6.65 26.7 16.9
粉质黏土 52~57 19.2 30.4 1.71 1 620 8.28 42.0 16.8
粉质黏土 57~60 19.4 30.0 1.74 1 620 8.22 42.9 17.0
Tab.1 Physical-mechanical and thermo-physical parameters of soil
Fig.1 Distribution of gauges in geothermal energy pile
n to/ h 运行时间 tc / h tr / d ts / d
1 12 8:00~20:00 12 23 27
2 8 8:00~16:00 16 23 27
Tab.2 On-site thermo-mechanical coupling test plan
Fig.2 Inlet/outlet temperature of heat exchange tube with time in intermittent mode
Fig.3 Heat transfer performance of geothermal energy piles with time
Fig.4 Temperature distributions of geothermal energy pile with time
Fig.5 Temperature increment distributions of geothermal energy pile along depth
Fig.6 Observed strain distribution of geothermal energy pile along depth
Fig.7 Additional axial thermal stress of geothermal energy pile along depth
Fig.8 Additional axial thermal stress of geothermal energy pile with temperature
项目 桩型 L /m 约束情况 土层 E/GPa 模式 Δθmax/
℃ 		αθmax/
(kPa·℃?1) 		αθp/
(kPa·℃?1) 		αθe/
(kPa·℃?1) 		γp/ % γe/ %
文献[13]、[14] 钻孔灌注桩 25.8 建筑约束 软土/砂砾/
软砂岩 		29.2 连续 18 292 150 79 51.7 27.1
文献[23] 钻孔灌注桩 24.0 自由 粉质黏土/
黏土 		30 连续 14.5 309 73 170 23.6 55.0
文献[22] PHC桩 24.0 自由 淤泥质黏土/
粉质黏土 		45.7 连续 20 530 110 186 20.7 35.1
本研究 静钻根植桩 52.0 建筑约束 见表1 38 n=1 11.0 380 328 205 86.3 53.4
本研究 静钻根植桩 52.0 建筑约束 见表1 38 n=2 8.2 380 343 231 90.3 60.8
Tab.3 In-situ test results of several geothermal energy piles
Fig.9 Additional frictional resistance of geothermal energy pile along depth
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