【摘要】 为分析电缆隧道中隧道直径与电缆热效应的影响关系，采用有限元方法建立了电磁–热–流多场耦合计算模型，分析隧道直径在不同环境和条件下对电缆热效应的影响规律。结果表明：在相同负载下，围岩温度决定电缆基准温度，隧道直径增加对电缆温度的降幅作用有限；在低围岩导热系数或多回路敷设情况下，隧道直径对电缆温度的影响显著；不同电压等级混合敷设时，低电压回路越多，直径增加对电缆温度的影响效果越显著，需关注电压等级的占比情况。通过正交实验进一步分析，发现电缆回路对电缆载流量的影响最为显著，并建立了载流量与隧道直径等因素的量化关系模型。更多还原

【Abstract】 To analyze the relationship between tunnel diameter and cable thermal effects in cable tunnels, an electromagnetic-thermal-fluid multi-physical coupled computational model is established by using the finite element method in conjunction with heat transfer theory, and the influence of tunnel diameter on cable thermal effects under various environmental conditions is investigated. The results indicate that under identical load conditions, the surrounding rock temperature determines the reference temperature of the cables, and increasing tunnel diameter has a limited effect on reducing cable temperature. However, when the surrounding rock has low thermal conductivity or multiple circuits are laid, the tunnel diameter significantly impacts cable temperature. For mixed-voltage installations, the greater the number of low-voltage circuits, the more pronounced the effect of increased diameter on cable temperature, necessitating attention to the proportion of voltage levels. Further analysis through orthogonal experiments reveals that cable circuits exert the most significant influence on cable current-carrying capacity and a quantitative relationship model linking currentcarrying capacity to factors like tunnel diameter is established.更多还原