A kind of microbial modification filling coal mining method

Abstract

A microbial modification filling-based coal mining method, comprising the operation steps of performing ground microbial calcification on a filling material, conveying the calcified filling material to a goaf for tamping and filling, and then performing microbial grouting on a filling body, where microbial grouting and filling is performed after each step of coal mining is completed. By means of microbial filling, the compressive strength of the filling body is effectively improved, environment-friendliness is realized, and the biochemical mechanism-based microbial filling-based coal mining technology in a high-stress deep part is taken to a new direction.

Description

technical field [0001] The invention relates to a microbial modified filling coal mining method, which belongs to the technical field of solid filling coal mining. Background technique [0002] With the increase of mining depth, the deep mining of coal resources is gradually going deep. For the deep mining environment, the filling body is fully compacted and the roof subsidence is further increased, resulting in poor filling effect and violent movement of the roof strata. It is necessary to improve the filling material to deal with the problems caused by high ground stress and high osmotic pressure. [0003] In order to adapt to the deep mining environment, the filling material is prepared and improved by microbial solidification. Microbial solidification, that is, microbial-induced calcium carbonate precipitation technology, is a new type of soil solidification technology. Its principle is to provide nitrogen sources and calcium ion sources to certain specific microorganis...

AI Technical Summary

Problems solved by technology

For the deep mining environment, the filling body is fully compacted and the roof subsidence is further increased, resulting in poor filling effect and violent movement of the roof strata. It is necessary to improve the filling material to deal with the problems caused by high ground stress and high osmotic pressure.

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