Wet treatment method to accelerate settlement stability of coal gangue filling reclamation

Abstract

The invention provides a moist curing method for accelerating subsidence and stability of coal gangue filling reclamation, and belongs to the method for agricultural or forestry reclamation of coal gangues. The moist curing method comprises the following steps: after filling a subsidence land by using the coal gangues, consciously filling water to soak a coal gangue aggregate, and accelerating subsidence and stability of the coal gangues; and stripping collapse surface soil by 1.0 meter at first before the rainy season, pouring the coal gangues in a collapse pit until the distance from the coal gangues to an earth surface by a designed elevation, leveling a coal gangue site, filling water in the site until coal gangue bodies are submerged, maintaining until the rainy season is finished, compacting for 4-5 times by using compacting equipment, and finally refilling the collapse pit by using the surface soil and leveling the site. The moist curing method has the advantages that (1) the collapse pit is refilled with the coal gangues at a time, and layered filling compaction is not required, so that reclamation cost is greatly reduced; (2) adverse effects of hydrophilic substances in the coal gangues to subsidence are eliminated, uniformity of subsidence is guaranteed to a maximum extent, compaction times are reduced, and leveling of a farmland is guaranteed; and (3) effects of rising and falling of groundwater level to coal gangue filling reclamation lands are reduced.

Description

technical field [0001] The invention relates to a coal gangue agricultural or forestry reclamation method, in particular to a wet treatment method for accelerating coal gangue filling, reclamation and settlement stability. Background technique [0002] Coal gangue is solid waste generated during coal mining and washing. It is used as filling material to fill coal mining subsidence areas or similar low-lying lands, and then reclaim them as agricultural land after covering with soil. This not only enables the treatment and utilization of coal gangue waste, but also reclaims the land damaged by coal mining, so the reclamation of coal gangue filling is widely accepted. However, when a large area of ​​coal gangue is filled for reclamation, the surface often has uneven settlement, which seriously affects the promotion of this technology. At present, the common solution is layered filling and compaction to reduce the porosity of coal gangue, but the cost of layered filling and com...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a wetting treatment method that accelerates coal gangue filling reclamation and settlement stability, solves the problem of uneven settlement of the ground surface in land reclamation in mining areas and the control problem of unfavorable engineering characteristics of coal gangue, and eliminates the problem of coal gangue wet swelling characteristics impact, reducing reclamation costs

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