A method for fully filling the roof with gangue in goafs in underground mines

Abstract

The invention discloses a method for fully filling the roof with gangue in the goaf of an underground mine. A rectangular wall is built in the goaf as a filling unit; the gangue is reciprocated and evenly filled in the filling unit layer by layer through the filling window, during which the gangue is reciprocated. The filled gangue is compacted layer by layer; the bagged gangue is pushed to the under-joint space and tamped until the bagged gangue fills the under-joint space between the loose-filled gangue and the roof; the filling window is placed according to the retaining wall The construction standard shall be closed, and the gap between the retaining wall and the roof shall be sealed with concrete grout. The method of the invention can realize the gangue filling, filling, branching and jacking state.

Description

technical field [0001] The invention relates to the technical field of coal mine green mining, in particular to a method for fully topping and filling gangue in goafs of underground mines. Background technique [0002] The solid filling mining method belongs to the green mining technology system and is an ideal way to solve the environmental problems of coal mining. Gangue filling mining is a filling form in the solid filling mining method. It has the advantages of well-going and consumption, and the use of surface gangue can effectively alleviate surface environmental pollution. Coal mining methods combined with gangue filling mainly include roadway filling mining (strip filling mining), roadway filling and recovery of partial strip coal pillars, longwall working face gangue filling mining, pillar system filling mining, short wall filling mining, etc. In addition, there is gangue filling mining for chambers and roadways. The amount of under-joint jacking is an important i...

AI Technical Summary

Problems solved by technology

[0003] The existing methods of filling and connecting gangue to the roof have the characteristics of non-standard operation methods, unsuitable corresponding equipment and processes, low degree of mechanization, low operating efficiency, and poor quality of filling and roofing. The gangue under-topping phenomenon caused by the inability of the gangue to effectively fill the area to be filled is mainly due to the following aspects: 1. The gangue filling body is a loose material, and the filling body will produce a natural repose angle under the influence of gravity. The gangue is easy to slip and difficult to fill. 2. Due to the limitation of underground working space, waste rock filling cannot be operated from any height and angle, and there are operation blind spots and low-frequency areas; 3. The filling equipment and process are unreasonable, and the filling equipment and process in the existing filling methods are all Taking the macro goal of transporting gangue to the goaf as the main design requirement, the factor of sufficient roofing of gangue has not been paid enough attention and fully considered. Although the concept of filling the woven bag of gangue into the under-roofing space has been proposed, it has not been clarified. The corresponding supporting equipment and technology in the filling process, or only using a forklift to manually fill the woven bag of gangue to the gap between the gangue body and the roof, or even the filling and connecting process of artificial gangue and manual tamping, the filling efficiency 4. The tamping operation method of filled gangue has limited effect. As the basis for filling gangue to connect to the roof, the tamping quality of gangue will largely affect the degree and quality of gangue to be connected to the top. , the disclosed methods for filling and compacting gangue include using a small-area tamping board to tamp the gangue body obliquely upward, using a tamping board to tamp the lower part of the gangue pile horizontally, and using an underground forklift to tamp the gangue body. No further improvement in quality

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