Method for designing surface soil covering thickness for coal gangue filling and reclamation in coal mining subsidence area

Abstract

The invention discloses a method for designing the surface soil covering thickness for coal gangue filling and reclamation in a coal mining subsidence area. The method comprises the following steps: a, investigating and analyzing lumpiness structure characteristics of filling and reclamation materials, namely coal gangues; b. designing the surface soil covering thickness according to the lumpiness structure characteristics of the coal gangues. The method has the advantages that the different influences of different coal gangue lumpiness structures on the surface soil covering thickness when the coal gangues are used for filling and reclamation can be disclosed, and the quantitative relation between the coal gangue lumpiness and the surface soil covering thickness can be given, so that certain guiding significance is provided for land reclamation engineering practice in the coal mining subsidence area; different surface soil covering thicknesses are designed according to differences of the coal gangue lumpiness structures, so that soils of the whole reclamation area have the same moisture and fertility preserving capability, and the unified management on fertilization, irrigation and the like can be facilitated; due to the reasonably designed surface soil covering thickness in the coal gangue filling and reclamation area, the mellow soil resources can be saved greatly, and meanwhile, the damage of other land resources caused by the taking of a large amount of soil can be avoided.

Description

technical field [0001] The invention relates to a method for designing thickness, in particular to a method for designing the thickness of surface covering soil for coal gangue filling and reclamation in a coal mining subsidence area. Background technique [0002] With the development of society and economy, the total amount of coal mining and utilization is increasing year by year. At the same time, large-area surface subsidence caused by underground mining and a large amount of coal gangue are produced. In the plain mining area with a higher phreatic level, the subsidence area is more low-lying and prone to water accumulation, making the cultivated land unable to be cultivated. For a long time, coal gangue in my country and abroad has only been used in a small amount for building materials or other fields. The piles of gangue in coal mining areas not only occupy land resources but also pollute the environment. Therefore, most coal mining enterprises choose coal gangue as...

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Problems solved by technology

[0003] Usually, coal gangue is used as a cushion for filling and reclamation, and its block structure is generally not considered. The coal gangue layers with large block and small block are covered with the same soil thickness, so it is inevitable to fill the reclaimed land with coal gangue. There will be different land use effects

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