Method for reconstructing soil in coal mining subsidence area by using coal-based solid waste

Abstract

The invention provides a method for reconstructing soil in a coal mining subsidence area by using coal-based solid waste on the basis of a coal mining subsidence area treatment technology of deep excavation, shallow filling and recovery while mining. On the basis of surface dynamic subsidence prediction based on a Logistic time function, the coal mining subsidence area is divided into a heavy metal pollution prevention layer, a first filling layer, a sandwich soil layer, a second filling layer, a subsoil layer, a surface soil layer and a blocking layer according to the layering height proportion, layered backfilling is conducted in sequence, coal-based solid waste and original soil are laid in each layer according to the design proportion, meanwhile, auxiliary materials such as a soil conditioner and compost are added, and a near-natural soil structure is constructed, so that the soil reconstruction target is achieved. The effects of moisture and fertilizer retention of reconstructed soil and providing of real soil are achieved, the cultivated area can be increased to the maximum extent, environmental deterioration of the coal mining subsidence area is reduced, meanwhile, a large amount of the coal-based solid waste is consumed, the treatment cost of the coal-based solid waste is reduced, pollution of heavy metal to soil and a water system is weakened, and ecological treatment of the coal mining subsidence area and safe and green coal mining are promoted.

Description

technical field [0001] The invention relates to the field of ecological management of coal mining subsidence areas in green mining in the coal industry, and in particular to a method for using coal-based solid waste for soil reconstruction in coal mining subsidence areas. Background technique [0002] With the rapid development of my country's economy, the demand for coal has increased sharply in recent years. Large-scale mining produces a large amount of coal-based solid waste, which leads to surface subsidence, damage to cultivated land, pollution of water systems, and the formation of a large number of subsidence areas. Ecological and environmental problems have become increasingly prominent. In the face of a large number of coal mining subsidence areas and coal-based solid waste, although coal mining subsidence areas have been built into coal geological parks and aquaculture in recent years, the ecological management is still in the theoretical foundation stage, and curre...

AI Technical Summary

Problems solved by technology

In the face of a large number of coal mining subsidence areas and coal-based solid waste, although coal mining subsidence areas have been built into coal geological parks and aquaculture in recent years, the ecological management is still in the theoretical foundation stage, and currently The comprehensive utilization of coal-based solid waste is relatively simple, and the added value of deep-processed products is generally low. Waste reduction, harmlessness, and resource utilization are imperative

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