Reinforcement of soil nails,durability of grout filler and concrete,drainage system and other measures should be considered specially in the design of the soil-nail retaining structure for durability.

• 永久性土钉支护结构的耐久性设计可从土钉的配筋、土钉浆体及混凝土的耐久性、排水及构造措施等方面进行考虑。