High-safety transportation channel in filling body and construction method of high-safety transportation channel

The invention provides a high-safety transportation channel in a filling body and a construction method of the high-safety transportation channel. The construction method comprises the following steps that a combined arch frame is arranged at a preset position of a goaf, and two to-be-communicated areas can be communicated through a channel formed by the combined arch frame; filling retaining walls are arranged at the joints of the goaf and the roadways of the two to-be-communicated areas, and the goaf is completely filled with filling slurry; and after the filling slurry in the goaf is solidified to form a filling body and the filling body reaches the preset strength, the filling body in the combined arched frame is dug out, and a transportation channel is formed. The combined arch-shaped frame and the filling slurry are firmly combined to form a whole, so that the filling body and the combined arch-shaped frame form a whole, the combination firmness of the combined arch-shaped frame and the filling body is