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明洞衬砌的顶部回填土与拱部衬砌的外缘接触面,常因回填土石密实度较差,又没设粘土隔水层,一般易被地表水渗入混凝土中造成渗漏病害。因此必须铺设防水层及粘土隔水层,以防止外来水的渗透而损坏结构,同时在寒冷季节还应考虑冻溶循环损坏结构。明洞顶防水层,一般常用甲种或乙种防水层,常用的材料为沥青、石棉粉、麻布、
The contact surface between the backfill of the top of the lining of the Myeongdong tunnel and the outer edge of the lining of the arch, often because of the poor compaction of the backfilled earth and stone, and no clay aquifuge, is generally easily penetrated by the surface water into the concrete to cause leakage. Therefore, a waterproof layer and a clay water barrier must be laid in order to prevent the penetration of foreign water and damage the structure, and in the cold season, the freeze-thaw cycle should also be considered to damage the structure. Myeongdong top waterproof layer, commonly used A or B waterproof layer, commonly used materials are asphalt, asbestos powder, linen,