寒区老旧隧道病害特征及治理方法研究

 以沈丹线运营期老旧隧道为例，结合现场工程实际开展渗漏水病害调查，通过病害情况素描和地质雷达扫描等方法，从隧道腐蚀开裂、衬砌渗漏水及冻害、衬砌围岩空洞及洞口仰坡坍方落石、附属设施损坏等方面，详细分析运营期寒区老旧隧道的病害特征，并从物理因素和化学因素两方面对劣化机制做简要描述。在此基础上，结合国内外相关资料和寒区铁路隧道运营特点，给出老旧隧道的维修体系流程，并针对主要病害类型分别给出相应的治理方法，最后结合分水岭隧道维修工程进行现场应用。为运营期寒区老旧隧道典型病害的治理方案设计和施工提供理论依据，对老旧隧道渗漏水病害综合治理及指导工程实践具有重要的实用价值。

STUDY OF DEFECTS CHARACTERISTICS AND REPAIR METHODS OF OLD TUNNEL IN COLD REGION

According to the characteristics of old in-use tunnels of Shenyang—Dandong railway，an investigation on defects like water leaking has been carried out by sketch of tunnel damage and ground penetrating radar(GPR) scanning. The features of defects such as tunnel lining cracking，surface corrosion，water infiltration，freeze-thaw，lining vacuousness，collapse and rockfall of the entrance，etc. are studied and analyzed carefully. The degradation mechanism of tunnels is briefly analyzed from the physical factors and chemical factors. Based on the above， combining the relevant data and operating characteristics of the railway tunnel in cold regions，the flow chart of tunnel maintenance and the main repair methods are given. And these methods are carried out in the Fenshuiling tunnel maintenance works at last. The paper provides theoretical basis for integrated maintenance of tunnels and contributes to the guidance for engineering practice.