Coal gangue and soil layer combination based multilayer structure filling reclamation method

Abstract

The invention relates to a coal gangue and soil layer combination based multilayer structure filling reclamation method, comprising the following implementation steps of: a, measuring and calculating the area, the average depth and the maximum depth of a to-be-reclaimed area, on the basis, further estimating the filling elevation and the filling thickness of the to-be-reclaimed area and calculating the porosities of two to-be-filled coal gangues with different particle sizes; b, filling the coal gangue with the larger diameter in the two to-be-filled coal gangues into the bottommost layer of the to-be-reclaimed area; c, covering a clay layer on the first coal gangue layer and rolling to be level; d, covering the coal gangue with the smaller diameter in the two to-be-filled coal gangues on the clay layer, and tamping in layers; and e, covering surface soil on the second coal gangue layer and rolling to be level. By using the method provided by the invention, not only can the reclamation of a coal gangue filling sinking area be realized, but also the problem of poor water retention, soil moisture conservation and fertilizer conservation performances can be solved and the economic benefits of land products can be restored to the maximum extent.

Description

technical field [0001] The invention relates to a reclamation method, in particular to a multi-layer structure filling reclamation method based on the combination of coal gangue and soil layers. Background technique [0002] For coal mining areas, due to the mining of coal, large-scale subsidence areas will appear on the surface. Coal gangue piles up on the surface all the year round to form coal gangue hills of different sizes. Coal gangue hills are prone to spontaneous combustion, pollute the environment after being leached by rainwater, and occupy land resources at the same time. The existing coal gangue filling reclamation generally adopts the method of directly filling the subsidence area with coal gangue and then covering the topsoil. Although a certain reclamation effect has been achieved, the soil water and fertilizer retention performance of the reclamation land is poor, and the yield of cultivated crops is low, so it cannot be maximized. Restore the land use value...

AI Technical Summary

Problems solved by technology

[0002] For coal mining areas, due to the mining of coal, large-scale subsidence areas will appear on the surface. Coal gangue piled up on the surface all the year round to form coal gangue hills of different sizes. Coal gangue hills are prone to spontaneous combustion, pollute the environment after being leached by rainwater, and occupy land resources at the same time

The existing coal gangue filling reclamation generally adopts the method of directly filling the subsidence area with coal gangue and then covering the topsoil. Although a certain reclamation effect has been achieved, the soil water and fertilizer retention performance of the reclamation land is poor, and the yield of cultivated crops is low, so it cannot be maximized. Restoring the land use value of the subsidence area to a certain extent

Images