1.河南理工大学土木工程学院,河南 焦作 454000
2.中建七局第四建筑有限公司,陕西 西安 710000
任连伟(1980—),男,副教授,博士。主要从事地基基础方面的教学和研究工作。E-mail: renhpu@163.com
收稿:2021-01-18,
修回:2021-02-05,
纸质出版:2022-10-28
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任连伟,韩志攀,霍继炜等.桩顶约束下桥梁大直径能量桩热力响应现场试验[J].防灾减灾工程学报,2022,42(05):937-944.
REN Lianwei,HAN Zhipan,HUO Jiwei,et al.Field Test on Thermal Response of Large Diameter Energy Pile under the Pile Top Constraint[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(05):937-944.
任连伟,韩志攀,霍继炜等.桩顶约束下桥梁大直径能量桩热力响应现场试验[J].防灾减灾工程学报,2022,42(05):937-944. DOI: 10.13409/j.cnki.jdpme.20210118001.
REN Lianwei,HAN Zhipan,HUO Jiwei,et al.Field Test on Thermal Response of Large Diameter Energy Pile under the Pile Top Constraint[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(05):937-944. DOI: 10.13409/j.cnki.jdpme.20210118001.
能量桩是一种绿色新技术,符合工程建设节能减排与绿色发展理念。为了研究大直径能量桩的热力学特性及结构响应,依托河南省三门峡灵宝市国道310底董桥台2×2群桩基础,在大直径灌注桩内埋设换热管形成能量桩。开展了无荷载夏季工况能量桩热响应现场试验,实测能量桩运行期间出、入水口温度、应力、回温后残余温度、温度变化量‑热致应力/轴力关系、桩顶位移等变化规律。试验结果表明:三组不同流速试验下,流速增大,桩身温度、应力有小幅增大;停止试验后回温5 d后残余温度仍有16%~28%,7 d后回温残余温度约11%~17%;桩身最大应力约为3.5 MPa;能量桩桩顶累积变形-0.98 mm(约仅为桩径的0.81‰);桩顶在单桩无荷载、无荷载承台群桩约束、单桩逐级加载、恒载承台群桩约束的不同条件下,
K
h
值分别为28.6%、37.8%、43.2%和71.4%;试验流速为0.6、0.8 m/s,每平米桩‑土接触面积换热量
q
A
分别是0.4 m/s流速下
q
A
的53%和128%。
Energy pile is a new green technology, in line with the concept of energy conservation and emission reduction in engineering construction and green development. In order to study the thermodynamic properties and structural response of energy piles of large diameters, a heat exchange pipe was buried in the large-diameter cast-in pile under the bearing platform to form an energy pile at the site of national G310, Lingbao city, Henan Province, 2×2 pile group foundation of Didong abutment. Field tests on the thermal response of energy piles without loading in summer were carried out to measure outlet and inlet temperature, stress, residual temperature after return temperature, temperature change-thermally induced stress/axial force relationship and pile top displacement during operation of energy piles. The test results show that the temperature and stress of the pile increased slightly with the increase of flow rate under three different flow rate tests. After stopping the test, the residual temperature was still 16%-28% after 5 days of reheating, while the residual temperature after 7 days was about 11%-17%. The maximum stress along the pile was about 3.5 MPa. The cumulative deformation of the pile tip of the energy pile was -0.98mm (about 0.81‰ of the pile diameter). The values of Kh of pile top were 28.6%, 37.8%, 43.2% and 71.4% respectively under different conditions of single pile no-load, no-load cap pile group constraint, single pile step-by-step loading, and constant load cap pile group constraint, showing an increasing trend. The
q
A
at the flow rate of 0.6 m/s and 0.8 m/s was 53% and 128% of
q
A
at the flow rate of 0.4 m/s.
Brandl H . Energy foundations and other thermo-active ground structures [J]. Géotechnique , 2006 , 56 ( 2 ): 81 - 122 .
刘汉龙 , 孔纲强 , 吴宏伟 . 能量桩工程应用研究进展及PCC能量桩技术开发 [J]. 岩土工程学报 , 2014 , 36 ( 1 ): 176 - 181 .
Liu H L , Kong G Q , Ng C W W . Applications of energy piles and development of PCC energy pile technical [J]. Chinese Journal of Geotechnical Engineering , 2014 , 36 ( 1 ): 176 - 181 . (in Chinese)
Blurne‑webb P J , Amatya B , Soga K , et al . Energy pile test at Lambeth College,London:geotechnical and thermodynamic aspects of pile response to heat cycles [J]. Géotechnique , 2009 , 59 ( 3 ): 237 - 248 .
Bourne‑webb P J , Amatya B , Soga K . A framework for understanding energy pile behaviour [J]. Proceedings of the Institution of Civil Engineers Geotechnical Engineering , 2013 , 166 ( 2 ): 170 - 177 .
路宏伟 , 蒋刚 , 王昊 , 等 . 摩擦型能源桩荷载-温度现场联合测试与承载性状分析 [J]. 岩土工程学报 , 2017 , 39 ( 2 ): 334 - 342 .
Lu H W , Jiang G , Wang H , et al . In-situ tests and thermo-mechanical bearing characteristics of friction geothermal energy piles [J]. Chinese Journal of Geotechnical Engineering , 2017 , 39 ( 2 ): 334 - 342 . (in Chinese)
Laloui L , Nuth M , Vulliet L . Experimental and numerical investigations of the behaviour of a heat exchanger pile [J]. International , 2006 , 30 ( 8 ): 763 - 781 .
Laloui L , Donna A D . Understanding the thermal mechanical behaviour of energy piles [J]. Proceeding of the ICE - Civil Engineering , 2011 , 164 ( 6 ): 503 - 519 .
Murphy K D , Mccartney J S , Henry K S . Evaluation of thermo-mechanical and thermal behavior of full-scale energy foundations [J]. Acta Geotechnica , 2015 , 10 ( 2 ): 179 - 195 .
Murphy K D , Mccartney J S . Seasonal response of energy foundations during building operation [J]. Geotechnical & Geological Engineering , 2015 , 33 : 343 - 356 .
桂树强 , 程晓辉 . 能源桩换热过程中结构响应原位试验研究 [J]. 岩土工程学报 , 2014 , 36 ( 6 ): 1087 - 1094 .
Gui S Q , Cheng X H . In-situ tests on structural responses of energy piles during heat exchanging process [J]. Chinese Journal of Geotechnical Engineering , 2014 , 36 ( 6 ): 1087 - 1094 . (in Chinese)
You S , Cheng X H , Guo H , et al . In-situ experimental study of heat exchange capacity of CFG pile geothermal exchangers [J]. Energy & Buildings , 2014 , 79 ( 4 ): 23 ‑ 31 .
You S , Cheng X H , Guo H , et al . Experimental study on structural response of CFG energy piles [J]. Applied Thermal Engineering , 2016 , 96 : 640 ‑ 651 .
任连伟 , 徐健 , 孔纲强 , 等 . 冬季工况多次温度循环下微型钢管桩群桩热力响应特性现场试验 [J]. 岩土工程学报 , 2019 , 41 ( 11 ): 2053 - 2061 .
Ren L W , Xu J , Kong G Q , et al . Field tests on thermal response characteristics of micro steel pile group under multiple temperature cycles in winter conditions [J]. Chinese Journal of Geotechnical Engineering , 2019 , 41 ( 11 ): 2053 - 2061 . (in Chinese)
方金城 , 孔纲强 , 孟永东 , 等 . 低承台2×2能量桩基础单桩运行热力耦合特性研究 [J]. 岩土工程学报 , 2020 , 42 ( 2 ): 317 - 324 .
Fang J C , Kong G Q , Meng Y D , et al . Thermo-mechanical coupling characteristics of single energy pile operation in 2×2 pile-cap foundation [J]. Chinese Journal of Geotechnical Engineering , 2020 , 42 ( 2 ): 317 - 324 . (in Chinese)
黄旭 , 孔纲强 , 刘汉龙 , 等 . 夏季制冷循环下PCC能量桩负摩阻力特性研究 [J]. 防灾减灾工程学报 , 2017 , 37 ( 4 ): 511 - 517 .
Huang X , Kong G Q , Liu H L , et al . Negative skin friction behavior of PCC energy pile under heating cycle [J]. Journal of Disaster Prevention and Mitigation Engineering , 2017 , 37 ( 4 ): 511 - 517 . (in Chinese)
徐建 , 任连伟 , 马艳 , 等 . 冬季工况下微型钢管桩热力响应特性数值分析 [J]. 防灾减灾工程学报 , 2019 , 39 ( 4 ): 665 - 672 .
Xu J , Ren L W , Ma Y , et al . Numerical analysis of thermal response characteristics of micro steel tube pile under winter working condition [J]. Journal of Disaster Prevention and Mitigation Engineering , 2019 , 39 ( 4 ): 665 - 672 . (in Chinese)
郝耀虎 , 孔纲强 , 彭怀风 , 等 . 桩端约束对桩身热力学特性影响的模拟分析 [J]. 防灾减灾工程学报 , 2017 , 37 ( 4 ): 532 - 539 .
Hao Y H , Kong G Q , Peng H F , et al . Analysis of thermo-mechanical behavior of sigle pile tip constraint [J]. Journal of Disaster Prevention and Mitigation Engineering , 2017 , 37 ( 4 ): 532 - 539 . (in Chinese)
混凝土结构设计规范 : GB 50010—2010 [S]. 北京 : 中国建筑工业出版社 , 2011 .
桩基地热能利用技术标准 : JGJ/T 438—2018 [S]. 北京 : 中国建筑工业出版社 , 2018 .
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