Grouting treatment method for coal seam roof quite-thick aquifer area

Abstract

The invention provides a grouting treatment method for a coal seam roof quite-thick aquifer area. The grouting treatment method comprises the following stages: at the first stage, before mining, sedimentary facies analysis is conducted, a valley-flat facies stratum is selected as a target stratum, and if no valley-flat facies aquiclude exists, a strong-permeability aquifer is selected as the target stratum; at the second stage, probing positioning of a permeable skylight is conducted on the valley-flat facies target stratum, grouting making-up is conducted on the valley-flat facies target stratum, or the strong-permeability aquifer is grouted to be transformed into the aquiclude; at the thrid stage, after a roof is transformed before mining, stability of the aquiclude can be utilized for monitoring; and at the fourth stage, after mining, a slip seam generated in the roof of a coal pillar can be grouted to form a waterproof curtain. Before mining, the skylight of the aquiclude is subjected to grouting making-up, or the strong-permeability aquifer is transformed into the aquiclude, after mining, the slip seam is grouted to form the waterproof curtain, thus the purposes of decreasingthe thickness of the aquifer and decreasing the water inflow of a mine are achieved, the down-hole operating environment is improved, the cost is lowered, and normal production of an inactive coal mine is restored.

Description

technical field [0001] The invention relates to the technical field of coal mine water hazard control, in particular to a grouting control method for a region of a coal seam roof with extremely thick aquifers. Background technique [0002] Water inrush disasters are very serious in many coal mines in Shaanxi, Inner Mongolia and Shandong in my country. Many water disasters caused by the huge aquifer on the roof have caused heavy loss of life and property. Large-scale equipment rusts quickly, shortens its lifespan, and increases production costs, making it unsustainable. [0003] At the same time, the gushing water produced by the flood also seriously deteriorates the working environment, the occupational health environment and the ground ecological environment, which seriously increases the danger of production. Coal mines built with huge sums of money cannot produce normally and are in danger of being closed. In order to control this kind of water damage, experts from natio...

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Problems solved by technology

[0002] Water inrush disasters are very serious in many coal mines in Shaanxi, Inner Mongolia and Shandong in my country. Many water disasters caused by the huge aquifer on the roof have caused heavy loss of life and property. Rapid corrosion of large equipment, shortened lifespan, sharp increase in production costs, unsustainable

[0003] At the same time, the gushing water caused by water damage also seriously deteriorates the working environment, occupational health environment and ground ecological environment, which seriously increases the danger of production.

Coal mines that cost huge sums of money cannot produce normally and are in danger of being closed

In order to control this kind of water damage, experts from national coal mine water prevention and control scientific research institutions and teaching units have adopted various treatment technologies including traditional grouting curtain technology, powder and chemical grouting materials, vertical and horizontal drilling grouting methods, etc., but all have achieved results little

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