Thick-bed mining subsidence-land dynamic pre-reclamation method at plane mining-area

The invention discloses a dynamic pre-reclamation method for subsided land caused by exploiting a high seam in a plane mining area, which belongs to the technical field of mining and is used for solving the land reclamation problem of the subsided land caused by unstable subsidence mining. The dynamic pre-reclamation method is carried out when a mining subside is not complete and seeper is not formed; the dynamic pre-reclamation method consists of two stages: engineering design calculation and engineering implementation according to the scale, range and target needed to be reclaimed. The stage of engineering design calculation comprises the steps of: calculating a predicated subsidence, dividing the construction field pieces, confirming the construction parameters and the like. Compared with the prior art of 'first destroying and then controlling', the dynamic pre-reclamation method has the following advantages that the dynamic pre-reclamation realizes the full and effective combination of miming and reclamation, can reduce the reclamation investment, shorten the reclamation period, increase the reclamation benefit, and can promote the sustainable utilization of land resources in a mining area and the sustainable development of the mining area, can effectively ease the deterioration of the ecological environment in the mining area caused by the vegetation deterioration due to the mining subsidence and water and soil loss and most extensively protect the land resources.