Filling reclamation method for reclaiming coal mining subsidence lands by Yellow River sediment

Abstract

The invention relates to a filling reclamation method for reclaiming coal mining subsidence lands by Yellow River sediment and belongs to the technical field of mine environment protection. The filling reclamation method includes: confirming trends and sizes of Yellow River sediment filling strips according to the sizes and the shapes of a subsided basin to be filled; draining accumulated water in the subsidence land via existing drainage ditches around the subsidence land, and building a field path and drainage ditches along the vertical filling trend in the central area of the subsidence land; confirming the soil stripping depth of every strip according to the sediment depth, the available soil depth and reclamation elevation of every strip to be filled, stripping surface soil from subsoil in a strip-separated and layered stripping manner, and piling the surface soil and the subsoil on two sides of every strip; filling along a direction from two ends of the strips perpendicular to the central drainage ditches to the drainage ditches, covering the strips by the subsoil and the surface coil sequentially in a reasonable thickness after drainage consolidation of the filled sediment, and finally leveling the land to form a reconstructed soil profile. The filling reclamation method provides technical supports for filling reclamation of the coal mining subsidence lands by the Yellow River sediment.

Description

technical field [0001] The invention belongs to the technical field of mine environmental protection, and in particular relates to a filling and recultivation method for reclamation of coal mining subsidence land by Yellow River sediment in a high water level plain mining area. technical background [0002] In the eastern plains of China, there are several large mining areas such as Huainan, Huaibei, Xuzhou, Yanzhou, and Jining. Due to the high underground water level in these areas, water accumulation after subsidence is serious, and the loss of cultivated land in some areas can reach more than 50%. . The research on land reclamation in such areas first attracted the attention of scholars from all walks of life. Although China's land reclamation started late, it has developed very rapidly, and many practical reclamation technologies have been produced. However, the reclamation methods commonly used at present, such as digging deep and filling shallow, coal gangue filling, ...

AI Technical Summary

Problems solved by technology

[0004] Overall, there are still the following deficiencies in the existing lake mud filling technology, the silt discharge project in the beach area of ​​the lower reaches of the Yellow River, and the short-distance diversion of Yellow River sediment to fill and reclaim coal mining subsidence developed independently by some mining areas: (1) the existing The lake mud filling process and the sediment discharge project in the lower reaches of the Yellow River lack a reasonable division of the filling area, and the filling area is too large; (2) For the coal mining subsidence water accumulation area in the high-water level plain mining area, the existing direct filling process is completed after filling (3) The existing Yellow River sediment filling and reclamation technology is natural drainage, and the drainage section is small. Due to the thick filling sediment layer, the drainage consolidation time is long, and the filling The excess water in the material cannot be drained away for a long time, which brings great difficulties to the follow-up land leveling and topsoil covering work; (4) The existing sediment filling and drainage process is direct drainage, without sand-retaining measures. At the same time, it also takes away a lot of sediment, which can easily lead to siltation in drainage ditches

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