Soft rock area surge chamber intersecting tunnel section collapse rapid treatment method

The invention discloses a soft rock area surge chamber intersecting tunnel section collapse rapid treatment method. The method includes the main measures that a pre-buried steel pipe is arranged and serves as a ballast passing channel; rock ballast (or sand gravel) backfilling is performed on a collapse cavity area; shaft head locking of an intersection tunnel section (an upper chamber, a lower chamber and a diversion tunnel) intersecting with a surge chamber is performed through reinforced concrete annular beams; and grouting treatment and the like of the backfill rock ballast (sand gravel) of the position, outside a surge chamber designed excavation line, of the collapse cavity area are performed. According to the soft rock area surge chamber intersecting tunnel section collapse rapid treatment method, materials such as I-steel and steel plates are used, and the annular shaft head locking beams can maintain the stability of the rock wall of the intersection of the surge chamber; the backfill rock ballast (s