摘要
为探究外置双U型静钻根植工法能源桩换热性能,通过现场热响应试验,利用热源理论初步分析其岩土综合导热系数,建立三维传热数值模型并进行验证。利用三维传热数值模型分析换热管间距及其导热系数、换热液流速和桩周水泥土导热系数等因素对该新型桩换热性能的影响。分析结果表明,试桩区域岩土综合导热系数为1.64W(m·K)-1。提高换热管间距、换热管导热系数、换热液流速和桩周水泥土导热系数均能提高能源桩的换热性能,但当换热管间距大于0.25 m,换热液流速达到紊流态,换热管和桩周水泥土导热系数高于岩土综合导热系数后,提高上述参数对能源桩换热性能的提高贡献不大。
In order to explore the heat transfer performance of the Static Drill Rooted Energy Pile(SDREP),an equivalent thermal conductivity of the ground was investigated by using heat source theory based on the field thermal response test.A three-dimensional heat transfer numerical model of the energy pile was established and verified,and the influences of the tube spacing and its thermal conductivity,the fluid velocity,and the thermal conductivity of cement-soil around the pile on the heat transfer performance of the SDREP were analyzed.The results show that the ground equivalent thermal conductivity is 1.64 W(m·K)-1.The heat transfer performance of the energy pile can be improved by increasing the spacing of the heat exchange pipe and its thermal conductivity,the fluid velocity,and the thermal conductivity of soil-cement around the pile.However,when the tube spacing is over0.25 m,the fluid velocity reaching a turbulent state,or the thermal conductivity of tube and cementsoil is higher than that of the ground,there is little contribution to improve the heat transfer performance of the energy pile.
作者
娄扬
方鹏飞
张日红
谢新宇
王忠瑾
赖欣
何广
赵嵩
LOU Yang;FANG Pengfei;ZHANG Rihong;XIE Xinyu;WANG ZhongJin;LAI Xin;HE Guang;ZHAO Song(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Chongqing Jiaotong University,Chongqing 400074,China;NingboTech University,Ningbo 315100,China;Ningbo Research Institute,Zhejiang University,Ningbo 315100,China;ZCONE High-tech Pile Industry Co.,Ltd.,Ningbo 315145,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2021年第1期100-109,共10页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51708496)
浙江省自然科学基金项目(LY16E080010)资助。
关键词
能源桩
静钻根植工法
换热性能
热响应试验
岩土综合导热系数
geothermal energy pile
static drill rooted method
heat transfer performance
thermal response test
ground equivalent thermal conductivity