Method for repairing rock stratum shield subway tunnel after accidental breakdown

The invention relates to a method for repairing a rock stratum shield subway tunnel after accidental breakdown. The method adopts a mode of combining a dewatering well and a vertical shaft, the vertical shaft is excavated outside a tunnel to a breakdown point, rebars and concrete of tunnel segments are repaired, the repairing effect is good, and the influence on subway operation in the tunnel can be minimized. The inner diameter of the part, in the upper soil layer, of the vertical shaft is larger than that of the part in the lower rock layer, a backfill material is made of foam lightweight concrete, it is guaranteed that the whole backfill material is light, most gravity can be dispersed into the rock layer, the backfill material is prevented from generating too large pressure to the tunnel segments, and therefore the stress safety of the segment structures is guaranteed. 本发明涉及一种岩层盾构地铁隧道被意外击穿后的修补方法，采用降水井+竖井的方式，洞外开挖竖井至被击穿点，修补隧道管片钢筋及混凝土，修补效果好，并可将对隧道内地铁运营影响将到最低。竖井在上部土层内直径大于下部岩层内直径，回填材料采用泡沫轻质混凝土，保证整个回填材料轻，且大部分重力