深圳大学学报理工版

为研究不同因素对预制高强混凝土（precasthigh-strengthconcrete，PHC）能源桩换热性能的影响，建立PHC能源桩三维数值仿真分析模型，分析不同注浆回填材料导热系数、热交换管入口温度、桩体导热系数和PHC桩回填直径对PHC能源桩换热性能的影响.结果表明，PHC能源桩的换热量随注浆回填材料导热系数的增加而增大；制冷工况下，提高热交换管的入口温度有利于提升PHC能源桩的换热量；桩体导热系数的增加会提高PHC能源桩的换热性能；PHC能源桩的换热量随着PHC桩回填直径的增加而逐渐提高.通过田口法分析了不同因素对PHC能源桩换热性能的影响，热交换管入口温度的影响最大，其次是注浆回填材料导热系数和PHC桩回填直径，桩体导热系数的影响最小.研究结果可为PHC能源桩的工程设计和应用提供技术支撑和指导.

To investigate the influence sequence of different factors on the heat exchange performance of precast high-strength concrete（PHC）energy pile，a three-dimensional numerical simulation model of PHC energy pile was established and the effects of various thermal conductivities of grout backfill material，inlet temperatures of heat exchange pipe，thermal conductivities and backfill diameters of PHC pile on the heat exchange performance of PHC energy pile were analyzed. The results show that the heat exchange amount of PHC energy pile increases with the increase of the thermal conductivity of grout backfill material. In the cooling condition，increasing the inlet temperature of heat exchange pipe is beneficial to improving the heat exchange amount of PHC energy pile. Increase of thermal conductivity of PHC pile can enhance the heat exchange behavior of PHC energy pile. Moreover，the heat exchange amount of PHC energy pile gradually increases with increasing backfill diameter of PHC pile. On this basis，the Taguchi method was used to analyze the influence sequence of four different factors on the heat exchange performance of PHC energy pile. The impact of the inlet temperature of heat exchange pipe is the greatest，followed by the thermal conductivity of grout backfill material and backfill diameter of PHC pile，and the impact of thermal conductivity of PHC pile is the least. The results can provide a technical support and guidance for the design and application of the PHC energy piles in practical engineering.

引言
1 模型建立
2 数值模拟结果与分析
3 敏感性分析
4 结论

图1 PHC能源桩结构示意图Fig. 1 Schematic diagram of PHC energy pile

图2 PHC能源桩和地基模型和网格划分Fig. 2 Schematic diagram and mesh for the model of PHC energy pile and foundation

图3 回填注浆材料的传热模型的试验值和模拟值对比图Fig. 3 Comparison between experimental and simulated values for the grout material backfilled heat transfer model

表1 土体的热物性质Table 1 Thermophysical properties of soil

表2 PHC能源桩模型不同材料的热物性质Table 2 Thermophysical properties of different materials used in PHC energy pile model

表3 模拟计算的不同条件Table 3 Different conditions in the simulated calculation

图4 注浆回填材料导热系数对PHC能源桩换热性能的影响Fig. 4 Effect of thermal conductivity of grout backfill material on the heat exchange performance of PHC energy pile

图5 入口温度对PHC能源桩换热性能的影响Fig. 5 Effect of inlet temperature on the heat exchange performance of PHC energy pile

图6 桩体导热系数对PHC能源桩换热性能的影响Fig. 6 Effect of thermal conductivity of PHC pile on the heat exchange performance of PHC energy pile

图7 PHC桩回填直径对PHC能源桩换热性能的影响Fig. 7 Effect of backfill diameter of PHC pile on the heat exchange performance of PHC energy pile

表4 正交设计方案Table 4 Orthogonal test design scheme

表5 总换热量的响应表Table 5 Response table of total heat exchange amount

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备注

引言

1 模型建立

2 数值模拟结果与分析

3 敏感性分析

4 结论

期刊信息

备注

引言

1 模型建立

2 数值模拟结果与分析

3 敏感性分析

4 结 论

期刊信息

4 结论