In order to solve the problem of freezing damage treatment and anti-freezing design for railway tunnels in operation in the seasonal frozen area, this paper proposes a polyurethane-corrugated steel plate insulation lining, and studies its thermal insulation effect, relying on a freezing damage treatment project of an existing passenger-dedicated tunnel for on-site application. In this paper, the insulation lining is applied to the actual project and the insulation effect is verified by the field monitoring. The temperature test section was set in the anti-freezing design section. The polyurethane-corrugated steel plate insulation lining proposed in this paper is mainly composed of corrugated steel plate, polyurethane insulation layer and waterproof layer. The polyurethane-corrugated steel insulation lining is applied by using self-made rail flat battery car, door-type scaffolding, arch slide and other construction equipments. The on-site temperature test shows that the insulation effect is obvious. The polyurethane-corrugated steel plate insulation lining has the advantages of fast construction speed, good thermal insulation effect, preventing concrete from peeling off blocks, easy removal and replacement. According to the field temperature test, under the natural temperature outside the tunnel from −18°C to −22°C in winter of 2018–2020, the temperature of the interface between surrounding rock and lining of the tunnel monitoring sections are all above 0°C so that the freezing damage is eliminated from the root. Research results can provide a theoretical basis for the anti-freezing projects of tunnels in seasonal frozen area.

为解决季冻地区运营铁路隧道冻害处理及防冻设计问题，提出一种聚氨酯波纹钢板保温衬砌，依托冻害研究其保温效果。现有客运专线隧道治理工程现场应用。本文将保温衬里应用于实际工程，并通过现场监测验证保温效果。防冻设计段设置了温度测试段。本文提出的聚氨酯波纹钢板保温衬里主要由波纹钢板、聚氨酯保温层和防水层组成。聚氨酯波纹钢保温衬砌采用自制轨道平电瓶车、门式脚手架、拱滑道等施工设备进行施工。现场温度测试表明，保温效果明显。聚氨酯波纹钢板保温衬里具有施工速度快、保温效果好、防止混凝土剥落、拆卸更换方便等优点。根据现场温度测试，2018-2020年冬季隧道外自然温度-18℃至-22℃下，隧道监测断面围岩与衬砌界面温度均在0℃以上°C，从根部消除冻害。研究成果可为季冻区隧道防冻工程提供理论依据。