Coalmine consolidated solid strip filling coal mining method

Abstract

A coalmine consolidated solid strip filling coal mining method includes: by combination of cemented filling and solid filling, preparing cemented filling materials at a ground filling material preparation station, using a filling pump for pumping into a plurality of strip pulling nets in a worked-out area at the tail of a filling hydraulic support on a coal mining face to form a plurality of strip cemented retaining walls; feeding solid materials into an underground gangue chamber through a vertical feeding shaft; conveying the solid materials into a worked-out area filling face through an underground transport system, adopting a high-position self-moving type material filling stage loader for transporting the solid materials to a tamping scraper conveyor suspended on a tail beam of the filing hydraulic support, unloading the solid materials into a peripherally closed space formed by the cemented retaining walls, and tamping the solid materials by the aid of the tamping scraper conveyor to realize strip filling. The coalmine consolidated solid strip filling coal mining method has advantages that buildings, railways and underwater compressed coal mining can be freed up, coal mining rate of coalmines is increased, partial filling on a working face can be realized, and output of the working face is improved.

Description

technical field [0001] The invention relates to a strip filling coal mining method, in particular to a coal mine solid dense strip filling coal mining method suitable for pressing coal under coal mine buildings, water bodies and railways. Background technique [0002] The "three-down" coal pressing problem has always been an important issue restricting the sustainable development of many coal mines. According to incomplete statistics, at present, the "three-down" coal pressing of production mines in unified coal mines in my country has reached 13.79 billion tons. At the same time, the long-term Coal mining has led to a large amount of gangue discharge. At present, the accumulated coal gangue piled up in the country over the years is about 4.5 billion tons, and the gangue is still growing at a rate of 150 to 200 million tons per year. In order to improve the coal resource recovery rate of coal enterprises and solve the environmental pollution caused by waste rock discharge, so...

AI Technical Summary

Problems solved by technology

But on the other hand, solid dense filling is to achieve full-length filling of the working face. The huge filling space will inevitably lead to the extension of the filling operation time. It will also prolong the time for cutting coal at the working face. These are the main factors that limit the increase in the output of the working face. According to statistics, at present, the output of the working face with full-length solid dense filling is difficult to exceed 1 million t / year

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