Method for using coal-based solid waste for overlying strata isolation grouting filling

Abstract

The invention relates to a method for applying coal-based solid waste to overlying strata isolation grouting filling, according to different properties of coal gangue, coal ash and coal slime in the coal-based solid waste during overlying strata isolation grouting filling, the overlying strata isolation grouting filling performance of coal gangue powder can be improved by adding the coal ash and the coal slime, and when the coal ash and the coal slime reach a certain proportion, the coal ash and the coal slime are added into the coal-based solid waste to improve the overlying strata isolation grouting filling performance. The fluidity of the coal gangue powder can be improved, and the precipitation rate of the coal gangue powder is reduced. Furthermore, according to the state of the overlying strata space, the overlying strata isolation grouting filling is divided into the four stages of starting, developing, stabilizing and ending, and according to the development characteristics of fractures under the overlying strata during grouting in the four stages and the flow characteristics of slurry, the different stages of overlying strata isolation grouting filling are provided; different mixing proportions are adopted for overlying strata isolation grouting filling; the application problem of the coal gangue in grouting filling is solved, and the dilemma that materials of the overlying strata isolation grouting filling technology are insufficient and the dilemma that the coal gangue occupies land and pollutes the environment can be effectively improved.

Description

technical field [0001] The invention belongs to the field of green mining of mining engineering, and in particular relates to a method for using coal-based solid waste for isolation grouting filling of overlying rocks. Background technique [0002] Building (structure) coal pressing has always hindered the development of my country's coal mining industry, especially in the central and eastern regions of my country. Mining coal pressing under buildings has a great impact on liberating coal resources, alleviating the contradiction between resource development and human settlements, and protecting the environment. great significance. Overlying rock isolation grouting filling green mining technology has been widely used due to its remarkable effect of reducing settlement and economical rationality, but it also leads to shortage of original grouting filling materials and price rise. Coal gangue is waste produced in coal mining. It has low carbon content and poor combustion perfor...

AI Technical Summary

Problems solved by technology

Overlying rock isolation grouting filling green mining technology has been widely used due to its significant effect of reducing settlement and economical rationality, but it also leads to shortage of original grouting filling materials and price rise

Coal gangue is waste produced in coal mining. It has low carbon content and poor combustion performance. Most of it is piled up as waste. It not only occupies a large amount of land, but also has risks such as spontaneous combustion.

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