Multi-level long-path discharging-limiting device suitable for underground engineering

The invention discloses a multi-level long-path discharging-limiting device suitable for underground engineering. The device comprises a limited drainage pipe network system and a water collecting structure. Graded broken stone filter layers are arranged outside the side wall of a main underground body structure at fixed intervals; a longitudinal water-permeable blind pipe is arranged in each graded broken stone filter layer; every two adjacent longitudinal water-permeable blind pipes are connected through a plurality of sections of inclined flow guide pipes; and the longitudinal water-permeable blind pipe at the bottom layer is connected to the tops of a plurality of vertical drainage pipes. The bottom of each vertical drainage pipe is connected to a corresponding transverse drainage pipe. A terminal valve connected to a controller is arranged on each section of inclined flow guide pipe; water pressure sensors connected to the controller are arranged in the stratum beside the main underground body structure;