Reconstruction method of reclaimed soil profile in coal mining subsidence area

Abstract

The invention discloses a reconstruction method of a reclaimed soil profile in a coal mining subsidence area. The method comprises steps as follows: soil profile levels are divided according to an actual subsidence condition and governance goals of a reclamation area in combination of the difficulty level of actual operation; stacked natural soil is stripped layer by layer according to the divided soil profile levels; layered filling materials are designed according to an engineering to fill the subsided land, and compaction is performed; the filling layer is covered with a pollution blocking layer; soil layers stripped layer by layer are back filled according to the original soil sequence, and the reconstructed soil profile is formed through land leveling. On one hand, the pollution blocking layer is added on the basis of a conventional method, so that toxic and harmful elements carried by the filling materials are blocked; on the other hand, the thickness of a soil covering layer and the matching problem of the character of the soil covering layer and the filling layer are considered respectively according to application of reclamation land and the water content of the soil covering layer, all effective root systems of crops can grow on a soil layer, the water storage requirements are met, and the irrigation procedure is saved while an excellent growth environment is provided for the crops.

Description

technical field [0001] The invention belongs to the technical field of soil reconstruction, and in particular relates to a reconstruction method for filling and reclaiming a soil profile in a coal mining subsidence. Background technique [0002] Underground mining of coal mines in my country is the main mining method, accounting for more than 95% of the total output, however, coal mining is one of the main causes of land destruction. According to incomplete statistics, at present, 1,500 various mining areas in the country have occupied and damaged land areas of up to 2 million hectares, of which the area of ​​coal mining subsidence has reached 1 million hectares, and is still increasing at a rate of 33,000 to 47,000 hectares every year. , and most of them are high-quality grain fields and are concentrated in some key mining areas, resulting in sharp contradictions between man and land and industry and mines in these areas. Therefore, the reclamation of coal mining subsidenc...

AI Technical Summary

Problems solved by technology

However, when filling and reclamating subsidence land, little attention has been paid to the profile reconstruction of reclaimed soil, but it is simply carried out as a project, ignoring the nature and pollution of reclaimed soil in coal mining subsidence land filling. and quality issues

Images