Filling-reclaiming method for building land in coal mining subsidence areas

Abstract

The invention provides a filling-reclaiming method for building land in coal mining subsidence areas, which belongs to the technical field of mining and is used to solve the problem of developing and utilizing coal gangue. The invention adopts a technical scheme that the method is implemented according to the following steps: a, draining accumulated water in reclamation areas and clearing silt; b, striping and stockpiling surface soil; c, determining the thickness and density of coal gangue for hierarchical backfilling through a vibration pressure test; and d, performing hierarchical backfilling compaction on the coal gangue and soil. The method has the following main advantages that: 1, the ways of utilizing the coal gangue are expanded, and environmental pollution caused by stockpiling the coal gangue on ground is reduced; 2, the situation that building land is increasingly short is alleviated by reclaiming subsidence land to be the building land; and 3, the treatment for coal gangue for large-area hierarchical backfilling by a hierarchical vibration-compaction method is economical, reasonable and ideal in compaction effect, can improve the compactness and bearing capacity of coal gangue layers, and can prevent the spontaneous combustion or efflorescence of coal gangue foundations and the separation of harmful substances from polluting local environment because hierarchical compaction greatly reduces porosity and isolates air.

Description

technical field [0001] The invention relates to a reclamation technology for a coal mining subsidence area, in particular to a reclamation method for coal gangue and soil mixed filling of construction land in a coal mining subsidence area, and belongs to the field of mining technology. Background technique [0002] Coal mining enterprises, especially old coal production bases, will accumulate a large amount of coal gangue during the mining process for many years, and the accumulation of coal gangue will form large and small gangue hills. These gangue hills not only occupy a large amount of land, but also cause spontaneous combustion and rainwater leaching, thereby polluting the local atmosphere, soil, water and ecological environment, leading to serious social and environmental problems. How to economically and rationally use and dispose of these waste rocks has become a subject that coal mining enterprises have to study seriously. Practice has proved that the degree of wea...

AI Technical Summary

Problems solved by technology

The existing treatment methods for using coal gangue to reclaim coal gangue foundations in coal mining subsidence areas include dynamic compaction and grouting. Large coal gangue foundation; the grouting method is expensive, slow and poor in densification effect when applied in a large area

Said method also has the hidden danger that coal gangue may pollute the environment

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