隧道内地源热泵热交换管与隧道结构相互影响

Mutual Influence Between Tunnel Structures and Heat Exchange Pipes of Ground Source Heat Pump in Tunnel

摘要:

为解决寒区隧道冻害问题，将地源热泵型供热系统应用于内蒙古博牙高速扎敦河隧道中.系统由取热段、加热段、热泵和分、集水管路组成，可用于隧道洞口段衬砌和保温水沟加热.热交换管以串联纵向的布置形式埋设在初衬和二衬之间.通过计算含热交换管承载截面面积和惯性矩的减小率，分析得到热交换管对隧道衬砌承载力的影响较小，可以忽略.隧道结构内包括锚杆、防水板和钢拱架，通过建立单因素对比计算模型，分析各构件对热交换管换热量的影响，研究表明：①锚杆对热交换管换热量产生的影响不明显，最大仅为2.3%；②运行前期，应充分考虑防水板对热交换管换热量的不利影响，但长期运行后，可忽略防水板的不利影响；③运行前期，钢拱架对热交换管换热量有显著的提升，但长期运行后，该影响趋于不明显.

Abstract:

Tunnel heating system using heat pump was introduced for the first time at Zhadun River tunnel in Inner Mongolia Autonomous Region of China to prevent freezing damage in cold region tunnels. Tunnel heating system consists of the heating section, absorbing section, heat pump, collector, and distributor line. This system can be used for heating lining and insulation ditch in tunnel portal. The heat exchange pipes are laid between first lining and second lining in series of longitudinal arrangement. By calculating the decreased ratio of area and moment of inertia of carrying cross section within heat exchange pipes, the results show that the influence of heat exchange pipes on the carrying capacity of tunnel lining is so small that it can be ignored. Tunnel structure includes anchors, waterproof boards and steel arches. The influences of each component on the heat transfer of heat exchange pipes were analyzed by establishing single factor comparison model. The results show that: ① The influence of anchors on the heat transfer of heat exchange pipes is not obvious, only 2.3% at most; ② The disadvantageous influence of waterproof boards on the heat transfer of heat exchange pipes should be considered at the prophase, but it can be ignored after long running; ③ The advantageous influence of steel arches on the heat transfer of heat exchange pipes is obvious at the prophase, but it tends to be not obvious after long running.