Causes of shaft damage in mine plant coal pillar mining and the prevention technology
Aiming at the shaft damage in mine plant coal pillar mining and its control technology,taking Dashe Coal Mine as the engineering background,the movement and deformation characteristics of surrounding rock in the shaft of mine plant coal pillar mining were analyzed to reveal the causes of shaft damage.The scheme for shaft damage control in the follow-up working face of the project was proposed,and the corresponding construction technology was formed and successfully applied.The research shows that the 92606 working face under the mine plant region is adjacent to the auxiliary shaft,and the vertical additional force caused by mining has caused the shaft damage;Without taking preventive measures in advance,the subsequent mining of the 92606 working face will lead to secondary damage to the auxiliary shaft.The prevention and control scheme of single pressure relief groove without stopping production was proposed,which has the advantages of not affecting the mine production,high pressure relief rate,simple construction,low cost,etc.After grouting behind the lining,cutting the pressure relief groove,and erecting dense crib ring,the auxiliary shaft damage control project was accomplished without stopping production.The monitoring shows the shaft is in a safe state,as the vertical and hoop stresses are within the ultimate bearing capacity of the shaft wall.
mining of mine plant coal pillarprotection coal pillarformation settlementshaft wall damagepressure relief groovesurrounding rock control
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