超长电力电缆隧道固壁遮挡对土壤热库吸热特征的影响  

Effect of Blocked Area on Soil Heat Transfer Characteristic in Extra-Long Power Cable Tunnel

作　　者：汪雄平[1] 王亮[1] 成瑾 钟珂[2] WANG Xiongping;WANG Liang;CHENG Jin;ZHONG Ke(Shanghai Tunnel Engineering&Rail Transit Design and Research Institute,Shanghai 200235,China;College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]上海市隧道工程轨道交通设计研究院,上海200235 [2]东华大学环境科学与工程学院,上海201620

出　　处：《隧道建设（中英文）》2023年第S02期162-168,共7页Tunnel Construction

摘　　要：为探究电力电缆隧道通风设计中土壤热库吸热量简化计算方法的误差和适用范围,采用数值计算方法对隧道传热过程进行三维模拟研究。通过定义切向导热偏差率,量化评价简化计算方法所采用的一维传热假设与实际传热过程的偏差,分析现行简化计算方法在隧道内壁不同遮挡情况下的误差和适用性。结果表明:1)隧道内壁遮挡区边缘位置的切向导热偏差率最高达95%;2)双层隧道的下层空间,由于内壁面被遮挡程度大,使得土壤热库传热呈现典型的二维特征,简化计算方法误差高达57.5%;3)上层空间内壁面遮挡较少,传热过程与简化计算方法所做的一维假设类似,故计算误差仅约10%,这表明隧道土壤热库吸热量现行简化计算方法仅适用于双层隧道的上层空间,但不适用于下层空间。To define the application range of simplified calculation method of soil heat absorption in the ventilation design of power cable tunnels and analyze its calculation deviation,heat transfer process is simulated with numerical three-dimensional model.The deviation rate of tangential heat transfer is defined to quantitatively assess the deviation between one-dimensional heat transfer assumptions of the simplified calculation method and the actual heat transfer process,and the calculation deviation caused by simplified calculation method and its applicability are analyzed in the case of different obstructions on the tunnel′s inner surface.The results show that the maximum value can be up to 95%at the edge of the blocked area of tunnel inner wall.Since the blocked area of the lower part is greater than that of the upper part,the two-dimensional character of soil heat transfer is observed,and the deviation reaches 57.5%.The heat transfer process in the upper part is similar to the one-dimensional assumptions,and the deviation is only about 10%.Therefore,the current simplified calculation method for calculating the soil heat absorption in tunnels is mainly applicable to the upper chamber of the tunnel.

关 键 词：电力电缆隧道 固壁遮挡 土壤热库 传热维度 土壤吸热计算方法 

分 类 号：U453[建筑科学—桥梁与隧道工程]