Study on Grouting and Dredging of Drilling in Overburden Abscission Layer and Prevention of Slurry Leakage in the Working Face under Special Geological Conditions
In order to effectively solve the contradiction between coal pressure under buildings and mine mining,the grouting technology for overburden abscission layer during mining has been widely promoted and applied in recent years,and has produced good economic benefits.However,various slurry leakage accidents often occur in the grouting engineering of overburden abscission layer,which affects mine production and safety.Analyzed the p-t curve of drilling water pressure in the grouting engineering of mining overburden abscission layer,and successfully dredged the ZK-2 drilling hole that has been lowered into the grouting pipe using high-pressure gas-liquid linkage through hole technology.Based on the mining situation,the timing of drilling grouting was reasonably determined.On this basis,taking the slurry leakage event at the working face as a case study,a detailed analysis was conducted on the causes of slurry leakage from aspects such as geological structure,mining impact on crack development,and bearing pressure.A comprehensive disposal plan for slurry leakage was developed from four aspects:empirical formula for calculating the hydraulic input of sealing slurry,sealing timing,slurry materials and ratios,and specific implementation methods.After inspection,the sealing effect was good,and the disposal plan was scientific and effective.No similar accidents occurred during the subsequent grouting process.
prevention and control of water in coal minesabscission layer groutinggrouting drilling and dredgingslurry running on the working face
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