Alternate, multilayer and repetitive filling soil reconstruction method by using Yellow River sediment in reclamation of coal mining subsidence land

Abstract

The invention relates to an alternate, multilayer and repetitive filling soil reconstruction method by using Yellow River sediment in reclamation of a coal mining subsidence land, and belongs to the technical field of mine environment protection. The method comprises the steps of determining soil stripping thickness of a coal mining subsidence land and dividing the coal mining subsidence land into regular rectangular filling strips; determining soil filling reconstruction profile characteristics and further determining the sequence of the filling strips and the number of synchronous and alternate filling strips; performing layer-by-layer soil stripping on a group of synchronous and alternate filling strips by using an adjacent filling strip which does not belong to the group as a stripped soil stacking area for the synchronous and alternate filling strips, and stacking the stripped soil in corresponding subareas; performing alternate, multilayer and repetitive filling of sediment layers, drainage and covering of subsoil layers, and after reconstruction of all sediment layers and subsoil layers of all filling strips in the group of synchronous and alternate filling strips are completed, backfilling surface soil for coverage and flattening the soil. The method improves the water and fertility preservation performance of the reconstructed profile, accelerates the soil ripening of the sediment layers and facilitates the growth and development of crops.

Description

technical field [0001] The invention belongs to the technical field of mine environment protection, and in particular relates to a method for reconstituting alternately multi-layered and multiple-time filled soils in the Yellow River sediment reclamation and coal mining subsidence in high-water level plain mining areas. technical background [0002] In the high water level plain mining areas in eastern China, water accumulation is serious after coal mining subsidence. In some areas, the surface water area reaches more than 50% of the subsidence area, and the water accumulation exceeds 20m (Xiao Wu, Surface dynamic subsidence simulation in mining area and cultivated land reclamation Rate Analysis, 2013). The issue of land reclamation in such areas has always been the research focus of many scholars in China. Since the start of land reclamation in the 1980s in China, it has developed very rapidly. For such areas, the proposed methods of excavating shallow pads, coal gangue fil...

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Problems solved by technology

The issue of land reclamation in such areas has always been the research focus of many scholars in China. Since the start of land reclamation in the 1980s in China, it has developed very rapidly. For such areas, the proposed methods of excavating shallow pads, coal gangue filling, and fly ash Filling and many other practical reclamation technologies, but the contradiction between more people and less land in such areas has not been well resolved

The patent (CN103283335B) of "Yellow River Sediment Reclamation Coal Mining Subsidence Land Filling and Recultivation Method" adopts geotextile blocking measures after drainage, and continues drainage during the continuous filling process, which has played a certain role in blocking the Yellow River sediment from draining away clear water. However, Some of the clay and silt contained in the sediment of the Yellow River are still being discharged

[0005] Generally speaking, the existing short-distance diversion of Yellow River sediment filling technology still has the following deficiencies: (1) It is only suitable for sufficiently long filling strips. When the filling strip is short, the Yellow River mud The sand does not have a long enough sedimentation path, resulting in an increase in the Yellow River sediment in the drainage, which increases the burden of sand-retaining measures such as geotextiles at the drainage outlet; (2) The existing process of directly filling the Yellow River sediment with soil has formed a typical "upper sticky (3) The existing process of directly filling and covering the soil with the Yellow River silt adopts the continuous drainage method in the continuous filling process, which loses part of the viscous material in the Yellow River silt. (4) The existing Yellow River silt filling technology directly fills the soil, resulting in the Yellow River silt filling layer being too thick, the drainage and consolidation time is too long, and the water in the deep layer of the Yellow River silt filling layer cannot be drained away for a long time. Extended reclamation time

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