Application of Curtain Grouting Technology in Soft Coal Seam
DOI:
https://doi.org/10.63313/FE.9008Keywords:
Gas Extraction, Curtain Grouting, Drilling Cuttings Method, Gas ConcentrationAbstract
In order to solve the problems of serious air leakage and easy hole collapse in the process of gas extraction from bedding boreholes in soft coal seams under deep mining conditions, an advanced curtain grouting method for pre-blocking cracks and pre-reinforcement of soft coal bodies was proposed and applied in the field. In this paper, the 38021 working face of Xinzhuang Coal Mine is taken as the engineering background, and the thickness of curtain grouting is determined by drilling cuttings method. The vertical strip grouting curtain body is constructed by the arrangement of oblique plum-shaped grouting holes and the grouting method of low pressure and slow permeability, so as to realize coal body strengthening and efficient sealing of fracture network. The application results show that the initial extraction concentration of borehole gas is increased by 30 %, the attenuation rate of extraction efficiency is reduced to less than 15 %, and the effective extraction time of borehole is extended to 3 months.
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