A coal gangue filling reclamation method based on mud mixing in coal mining subsidence

Abstract

The invention discloses a coal-excavated subsidence area coal gangue filling reclamation method based on mud mixing. The coal-excavated subsidence area coal gangue filling reclamation method comprisesthe following steps that coal-excavated subsidence area coal gangue serves as a filling substrate, and filling is conducted to be about 10 cm below a normal water level line, a layer of about 3 cm thick plant residue covers after punning and leveling are conducted, then the coal gangue is filled again to be the normal water level line, meanwhile gaps of the coal gangue are filled with full viscidor soil viscid mud, and punning and leveling are conducted; the coal gangue is continuously filled with the mud, meanwhile, the gaps of the gangue are filled with mud in loamy texture or powder loamytexture and the like till the elevation needed by an overlaid surface oil layer is reached, finally the mud is covered with a layer of fertile mellow soil with the designed thickness, after levelingis conducted, using is recovered. The coal-excavated subsidence area coal gangue filling reclamation method has the advantages that the sizes of the coal gangue can be directly filled without the needof being screened in the filling process; the problems of communicating between the overlaid soil and an underground diving room and water leakage, fertilizer leakage, drought resisting and the likeof the overlaid soil can be solved at the same time; and meanwhile, the mellow soil resource is saved, and damage to other land resources due to the fact that a large amount of soil is excavated is avoided.

Description

technical field [0001] The invention relates to a method for filling a coal mining subsidence filling layer, in particular to a coal gangue filling and reclamation method based on mud mixing in a coal mining subsidence. Background technique [0002] Since the middle of last century, with the development of social economy, the total amount of coal ash mining and utilization has continued to increase. Underground coal mining has resulted in large-scale surface subsidence and a large amount of coal gangue. 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, only a small amount of coal gangue in my country and even abroad has been used in building materials or other fields. The piles of gangue piled up in coal mining areas not only oppress land resources, but also pollute the environment, and also affect the beauty of the landscape. The...

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Problems solved by technology

These methods and technologies play a certain role in solving the above problems, but the disadvantages of these methods are that they increase the use of mellow soil and the cost of screening gangue, and they cannot completely solve the problem.

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