Research on Pressure Relief Control Technology of Hard Roof in Pre-excavation and Withdrawal Channel in Majioliang Mine
Majialiang Mine is faced with serious deformation and damage of pre-excavation pullback channel.Based on the background of final removal of 14502 fully mechanized mining face,this paper studies the surrounding rock control technology of the new pullback channel based on hydraulic fracturing relief through in-situ stress monitoring,theoretical analysis and engineering analogy.Hydraulic fracturing control was carried out on the basic roof of sandstone with an average thickness of 5.37 m in the withdrawal channel,and the roof reinforcement support was adopted in the channel with anchor cable beam+stack support.The practice shows that after fracturing,the peak pressure of the leading support is reduced by 24.5％,and the influence range is reduced by 35.7％.The stress distribution and stability of the surrounding rock in the withdrawal channel are significantly weakened by mining.The deformation of the surrounding rock is controlled within a reasonable range with reinforcement support,and ideal pressure relief and support effects are achieved.
stress monitoringhydraulic fracturingstack bracketmoving upside down
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