U型深埋管固井层对埋管换热性能影响的研究

STUDY ON INFLUENCE OF CEMENTING LAYER ON HEAT TRANSFER PERFORMANCE OF U-BEND DEEP-BURIED PIPE

摘要: 结合西安市某个U型深埋管工程,建立三维全尺寸数值计算模型并进行模型验证。在此基础上,模拟分析不同导热系数的埋管固井层对埋管换热能力的影响。结果表明,固井层导热系数在小于及接近岩土层导热系数的范围内增加时,埋管换热强度随之增加明显;固井层导热系数对埋管换热的影响程度与周围竖向各层岩土导热系数的大小相关,而与地层竖向的温度分布无明显关系。

Abstract: Combined with a U-bend deep buried pipe project in Xi’an,a three-dimensional full-scale numerical calculation model is established and verified.On this basis,the influence of cementing layer with different thermal conductivity on the heat transfer capacity of the buried pipe is simulated and analyzed.The results show that when the thermal conductivity of the cementing layer increases within a range of less than or close to the thermal conductivity of the geotechnical layer,it has a significant effect on the heat transfer of buried pipes.In addition,the influence of the thermal conductivity of cementing layer on the heat transfer of the buried pipe is related to the thermal conductivity of the rock soil in vertical direction,but has no obvious relationship with the vertical temperature distribution of the stratum.