One-hole grouting and filling dual-purpose method implemented by aid of ground gas extraction drill holes

Abstract

The invention discloses a one-hole grouting and filling dual-purpose method implemented by the aid of ground gas extraction drill holes. The one-hole grouting and filling dual-purpose method is applicable to underground coal mines. The one-hole grouting and filling dual-purpose method includes extracting pressure relief gas of adjacent coal seams by the aid of the first ground gas drill holes in exploitation procedures; tripping grouting stopping wooden plugs in the first ground gas drill holes after extraction is completed and then gas starts to be extracted by the second ground gas drill holes, and cutting second cut solid casings to form cut openings; forming channels communicated with separation layers; grouting and filling separation layer zones; removing the grouting stopping wooden plugs after the separation layers are filled and the gas is completely extracted by the second ground gas drill holes; starting to grout and fill gobs; circularly extracting pressure relief gas of the follow-up ground gas drill holes in an integral coal mining working face and grouting and filling cover rock. The one-hole grouting and filling dual-purpose method has the advantages that the pressure relief gas is extracted while the cover rock is grouted and filled, accordingly, construction of special ground grouting drill holes can be omitted, the difficult problem of filled grout and gas flow interference can be solved, and problems in the aspects of gas extraction and earth surface subsidence control can be solved.

Description

technical field [0001] The invention relates to a grouting filling method, and is especially suitable for a dual-purpose method for grouting and filling in one hole by utilizing ground gas drainage boreholes used in underground coal mines. Background technique [0002] In coal mining, coal mining will lead to the movement of overlying strata and gas migration, and when they develop to a certain extent, mining disasters will be formed, such as surface subsidence (collapse) and gas gushing (outburst). Therefore, controlling the movement of rock formations and extracting pressure relief gas have become two major problems that mining technology workers need to solve. Controlling the movement of rock formations and extracting pressure relief gas itself are two opposite processes, that is, the former needs to prevent the bending and deformation of the rock formations, while the latter requires the rock formations to be fully decompressed and produce mining cracks before they can b...

AI Technical Summary

Problems solved by technology

At this time, it is no longer possible to carry out pressure relief gas drainage and overlying rock grouting filling as two independent projects, and it should be considered to realize both in the same project, but there is no such means and method in the existing technology , or only use surface drilling to extract pressure relief gas from the upper adjacent coal seam and give up overlying rock grouting filling, or only implement overlying rock isolation grouting filling without drainage of pressure relief gas

Obviously, these two kinds of prior art all can only realize single engineering purpose

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