Technology for preventing and treating coal seam roof water damage through dynamic pressure maintaining grouting blocking fissures of horizontal long drill holes in mining fractured zone

Abstract

The invention discloses a technology for preventing and treating coal seam roof water damage through dynamic pressure maintaining grouting blocking fissures of horizontal long drill holes in a miningfractured zone, and relates to the technical field of stope face safety of coal mines with roof water damage. At present, domestic roof water damage prevention and control technologies mainly comprisegoaf filling, strip mining, thickness-limited mining, drainage, static grouting and the like, and great limitations exist in deep water-rich extra-thick coal seam mining, such as waste of a large number of resources, high cost and unsatisfactory water control effect. According to hydrogeology of a mining area and development characteristics of the height of a mining overlying strata water diversion fractured zone under specific mining conditions, a reasonable target layer is selected, the horizontal long drill holes are formed, slurry meeting the requirements of the technology is selected, and along with mining of a working face, the horizontal long drill holes in the mining fractured zone dynamically block fissures in a pressure maintaining mode to prevent and treat coal seam roof waterdamage.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining roof water disaster prevention and control safety technology, and in particular relates to the construction of horizontally long boreholes using the kilometer directional drilling rig or ground horizontal well technology in the mining fracture zone and using the boreholes to perform dynamic pressure-maintaining grouting to seal the fissures The technical method for preventing and controlling roof water is applicable to the treatment of the problem of roof water damage caused by coal seam mining that may lead to the overlying aquifer. Background technique [0002] Mining of coal resources in underground coal mines is a high-intensity production activity, which will cause relatively strong movement and destruction of the overlying strata. According to different geological and mining conditions, dynamic and varying degrees of "saddle-shaped" collapse zones, fracture zones and overall movemen...

AI Technical Summary

Problems solved by technology

Practice has shown that the above methods have certain effects for specific conditions, but they also have certain limitations.

The first type of scheme is under the condition that the coal seam is thick or covered with multiple layers of aquifers, and the aquifer is close to the coal seam, even if the mining height is small, the water-conducting fracture zone will still communicate with the aquifer and control the roof water. The effect of pouring into the mine is not obvious, and it will also cause low resource recovery rate and recovery efficiency, and serious waste; the second type of scheme relies solely on Drilling and dredging cannot achieve the purpose of precipitation and peak shaving; and the third type of scheme, whether it is ground or underground hole-making grouting, is affected by the grouting material, geology and lithology, and the technological conditions of the grouting equipment. The water blocking effect is difficult to control, and when the mining level is deep, the amount and cost of pore-making engineering are relatively large

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