桦树沟排水渠是镜铁山矿区安全生产的关键工程，渠道冬季结冰后会出现渠道结冰冻害，严重威胁矿区曲轨平台及其他设施的安全运行，并造成局部水生态问题。为防止甘肃镜铁山矿业有限公司桦树沟渠道水在下游入渗至矿体，造成开采困难及安全隐患，采用人工改造方式对桦树沟排水渠进行改造工程，以保障矿区生产活动顺利和恢复局部水生态环境。改造结果表明，在渠道设双层聚氨酯夹芯板进行保温，并在进出口采用防寒门进行封闭的基础上，将原宽浅式梯形渠优化为窄深式“U”形渠，以增加小流量时的过流速度，实现了渠道冬季无结冰过流运行。改造后排水工程实施后经过4个冬季的安全运行，运行良好。由此可见，防寒保温、增大流速的综合防冰冻改造措施可实现高寒地区小流量渠道的冬季不结冰安全运行，这对寒冷地区冬季小流量排水工程设计及冬季安全运营起到一定的借鉴作用。

The Huashugou drainage channel is a key project for safe production in the Jingtie mountain mining area. Ice formation in the channel during winter leads to frost damage, posing serious threats to the safe operation of the track platforms and other facilities, as well as causing localized water ecological problems. To prevent water from the Huashugou channel from infiltrating the orebody downstream, which could complicate mining and introduce safety hazards, a reconstruction project was implemented using artificial methods. The aim was to ensure smooth production activities in the mining area and restore the local water ecological environment. The results of the reconstruction showed that by using double-layer polyurethane sandwich panels for insulation and installing cold-resistant doors at the inlet and outlet, the original wide and shallow trapezoidal channel was optimized into a narrow and deep 'U'-shaped channel. This modification increased the flow velocity during low flow conditions, allowing for ice-free flow during winter. After four winters of operation, the drainage project ran safely and efficiently. This demonstrates that the comprehensive anti-freezing measures of insulation and increasing flow velocity can ensure ice-free and safe operation of low-flow channels in cold regions during winter, providing a reference for the design and safe operation of winter drainage projects in cold areas.

TV672.3；TV698.26