A method of dynamically filling coal mining subsidence land with sediment from the Yellow River

Abstract

The invention provides a method for dynamically filling a coal mining subsidence area with Yellow River sediment and belongs to the technical field of mining, land utilization and land rehabilitation.The method for dynamically filling the coal mining subsidence area with the Yellow River sediment comprises the steps that according to a mining plant and the geological conditions of the coal miningsubsidence area, mining units are marked out, based on a Knothe time function, dynamic subsidence isopleths of all the mining time intervals of each mining unit are obtained by means of a probabilityintegral method; according to the rehabilitation range, each filling unit is marked out; the rehabilitation filling moment of the whole rehabilitation range Dt on the earth surface and the rehabilitation designed elevation of each filling unit are sequentially determined; the filling manner of the subsidence area is selected to be multi-layer repeated Yellow River diverting filling, and the features of each soil structure are determined; the number of times of multi-layer repeated Yellow River diverting filling of each filling unit and the filling time interval between two filling units are determined; the thickness of each type of soil structure layers is determined; according to the above determined filling parameters, multi-layer repeated Yellow River diverting filling is conducted oneach filling unit. By the adoption of the method for dynamically filling the coal mining subsidence area with the Yellow River sediment, the cultivated land rate can be greatly improved, and the rehabilitation period is shortened.

Description

technical field [0001] The invention belongs to the technical fields of mining technology, land utilization and land reclamation, and in particular relates to a method for dynamically filling coal mining subsidence land with sediment from the Yellow River. Background technique [0002] Coal is the most important energy source in China, accounting for about 70% of primary energy consumption. Since more than 90% of China's coal production comes from underground mining, and most of them are mined by the longwall full caving method, the land will inevitably sink, causing a large number of land subsidence and damage. According to calculations, the subsidence caused by underground mining of 10,000 tons of raw coal is as little as 0.033hm 2 , up to 0.533hm 2 , average 0.2~0.33hm 2 . For the high-water-level coal mining areas in eastern China, most of the mining results are subsidence and water accumulation, which increases the difficulty of later reclamation and also causes a l...

AI Technical Summary

Problems solved by technology

Due to the need to backfill the subsidence area to the design elevation during reclamation, the current reclamation methods commonly used in my country, such as shallow excavation pad, coal gangue filling, and fly ash filling, cannot solve the problem of overcrowding and lack of land in eastern China. contradiction

The area of ​​arable land that is dug deep and shallowly reclaimed is small, and coal gangue or fly ash filling requires a large amount of reclamation materials, and the transportation distance is large, and the economic cost is high. After filling, some chemical components or heavy metals contained in the filling will affect the crops. Both growth and product quality are affected. Moreover, industrial waste such as coal gangue and fly ash has been basically recycled in the mining area at present, and there is not enough coal gangue or fly ash for filling.

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