Treatment structure of underground cavern top arch development karst cave

The utility model discloses a treatment structure of an underground cavern top arch development karst cave, which is characterized in that a city gate opening type pilot tunnel is arranged to extend to the position near the karst cave, and an exposed support anchor rod is arranged in the karst cave; an auxiliary arch is arranged in a karst cave through a steel arch frame arranged on the section of an underground cavern, the auxiliary arch is connected with the steel arch frame, concrete is backfilled in the karst cave to the position outside a plastic area of the cavern, and a drainage pipe is embedded in the backfilled concrete. The pilot tunnel 2 is used as a traffic tunnel for detecting and cleaning a karst cave range influencing the stability of the underground cavern, the steel arch frame arranged on the section of the underground cavern is used for arranging the auxiliary arch, and the steel arch frame, the auxiliary arch and the exposed supporting anchor rod jointly bear the gravity of backfilled concr