Abstract: Almost 20-km retaining wall along G213 Highway (Maanshi tunnel to Yingxiu section, more than 30km ) was investigated. The results were as follows: debris of the retaining wall were scattered in the region with seismic intensity of 9 degree and partial destruction could be seen at 10 degree; seismic intensity and material of walls were fundam ental factors for seismic damage, height of walls and routed irection also exerted in fluence on seismic damage; retaining walls on rock were mainly inclined while retaining walls on soil had both inclining and sliding deformation; the average vertical maximum deformation part was as high as about 50% of retaining wall. Based on the analysis above and numerical simulation approach, some counterm easures in retaining wall seismic design were proposed.

Key words: subgrade engineering, retaining wall, seismic design, seismic failure type

摘要： 对汶川地震近场区213线马鞍石隧道至映秀30多km路段近20km路基挡墙震害进行了调查,获得结论:在 ??度地震烈度区,毁坏的挡墙只有零星分布,在度区也是局部现象;地震烈度、挡墙材料是对震害具控制性的因 素;挡墙高度、线路走向也对震害有影响;岩基挡墙主要以倾斜变形为主,土基挡墙兼有滑移和倾斜两种变形模式; 路堑墙竖向最大变形点平均位于墙高的50%左右。基于以上震害分析,结合数值模拟方法,提出了路基挡墙抗震 设计的注意事项。

关键词: 路基工程, 挡土墙, 抗震设计, 震害模式