New technology for conducting grouting filling for underground coal goaf and abandoned workings

Abstract

The invention relates to a new technology for conducting grouting filling for underground coal goaf and abandoned workings. The technology is characterized in that in grouting construction, the methods of sequentially conducting pressure-free grouting, micropressure grouting and repeated pressure grouting (increasing grouting pressure gradually) are adopted; the grouting filling construction efficiency can be greatly improved for the underground coal goaf and the abandoned workings, the construction period is greatly shortened, the construction cost is lowered, and then the pressure of grouting is truly increased to be about 5 MPa, and the construction quality is guaranteed.

Description

technical field [0001] The invention relates to the field of civil engineering construction, in particular to the construction field of foundation reinforcement grouting engineering and underground filling grouting engineering, specifically a new technology for grouting and grouting filling for underground coal mined-out areas and waste roadways. Background technique [0002] At present, for the uncollapsed coal mine waste roadway and coal seam goaf in the deep underground, it is usually adopted to drill a large hole from the ground to the ground ( 130 or more), and then use commercial concrete tank trucks to transport cement mortar with a label of about M5 to the drill hole, and directly discharge the mortar into the large hole, and the mortar will flow down to the deep cavity by gravity and then flow horizontally to fill the larger cavity space; For the collapsed coal mine roadway and coal seam goaf, as well as the natural gap above the collapse and rock formation fissure...

AI Technical Summary

Problems solved by technology

In view of the traditional operation line, only the pressure grouting process with small flow rate can be realized, the non-pressure grouting process with large flow rate cannot be realized, and it is difficult to realize the micro-pressure grouting process with medium flow rate (unless the grouting distance is very short); consider In the actual grouting operation, for the collapsed abandoned coal mine roadway and coal seam goaf, because the space is filled with irregular large plate-shaped stones, these stones are randomly stacked and stacked, forming many large stones. Voids, these cavities are connected to each other and lead to a large area (if cement mortar is used for filling, it cannot be filled in a large area due to poor fluidity), it can only be filled with grouting technology; and then realize the following problems: only The traditional grouting process of small-flow grouting does not match the size of the above-mentioned underground cavities, and it is often impossible to see what the state of the underground is, and it wastes a lot of time to follow the habit of grouting slowly

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