Support structure for soft tunnel surrounding rock

The utility model discloses a support structure for a soft tunnel surrounding rock, which can rapidly supplement stress of the surrounding rock, actively and stably support the surrounding rock, reduce the deformation time of the surrounding rock, and significantly reduce the deformation of the surrounding rock. The structure comprises the tunnel surrounding rock, the tunnel surrounding rock is provided with a group of primary support steel frames at intervals along the extension direction of a tunnel, and force application devices are arranged between the primary support steel frames and the surrounding rock; and a concrete structure is arranged between each two primary support steel frames, and the concrete structures are respectively connected with the two adjacent primary support steel frames and the surrounding rock. Prestress can be exerted on the primary support steel frames and the surrounding rock through the force application devices, so as to supplement the stress of the surrounding rock. When the