Cracked roof caving region grouting filling method

Abstract

The invention discloses a cracked roof caving region grouting filling method. The cracked roof caving region grouting filling method includes the steps that firstly, a working face filling main pipe is arranged in a crossheading of a working face; a filling roadway filling main pipe and valves are arranged in a grouting filling roadway, filling is sequentially conducted from the side, with the low elevation, of a coal bed bottom plate to the side, with the high elevation, of the coal bed bottom plate, the corresponding valve is closed when the filled grout amount of one working face filling branch pipe reaches the estimated amount, filling operation of a next working face filling branch pipe is conducted until all the working face filling branch pipes are filled, wherein the valves are used for controlling the filling roadway filling main pipe and anti-wear rubber hoses. According to the filling method, the mode that working face grouting and filling roadway grouting are combined, and grouting filling of a cracked roof caving region of a thin or medium-thick or thick coal bed can be achieved; working face grouting and filling roadway grouting are adopted in the filling method, working face production is basically not affected, mining and filling contradiction is small, and the yield of the filling working face is greatly increased.

Description

technical field [0001] The invention relates to a coal mine filling method, in particular to a grouting filling method for a broken roof caving area. Background technique [0002] At present, coal mine filling technologies widely used in my country mainly include paste filling technology, paste-like filling technology, high water filling technology, ultra-high water filling technology, gangue filling technology, etc. The above filling technologies are all under the condition of complete roof For filling, a certain filling time and space must be guaranteed while filling. Although the above-mentioned filling technologies have formed a relatively complete system and process, the above-mentioned various filling methods all fill the goaf under the premise that the roof of the goaf is complete. Difficult, not suitable for goaf filling under broken roof conditions. [0003] In view of the fact that my country's "three undercuts" coal pressure is serious, and the broken roof coal s...

AI Technical Summary

Problems solved by technology

[0005] CN102444419A A kind of thin coal seam broken roof tube drag filling system discloses a kind of thin coal seam broken roof trusteeship filling system, although it has realized the thin coal seam mined-out area filling under the broken roof condition, but its system still has some defects, such as , the high-level filling steel pipe described in the system only exists under the premise of gob-side entry retention; under the action of pump pressure, the filling slurry is injected into the void of gangue through the filling pipe arranged on the floor of the goaf, and its injection height is limited, only It is suitable for thin coal seams. For thick and medium-thick coal seams, the height of the caving zone is large, and the filling effect is poor only by pumping the filling pipe arranged on the bottom plate of the working face to the caving gangue gap.

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