Research on the Application of Surrounding Rock Control Technology for Layered Along the Gob in Layered Mining
In order to solve the problem of difficult control of stress concentration in coal pillar retaining tunnels,taking Guhanshan Mine as the background,theoretical analysis,field experiments and other methods are adopted to propose the technique of retaining tunnels along the goaf in lower layers.Research has shown that the presence of complete and large block structures on the false roof of the lower layered working face is the main cause of high roadway pressure.Therefore,a dense drilling roof cutting technique is proposed,and parameters such as roof cutting height,angle,and hole spacing are determined.Using anchor cable beams to strengthen the support of its roof structure.After implementation,the top plate of the retained roadway section sank by 356 mm and the two sides contracted by 656 mm.After lagging behind the mining face by 110 m,it basically no longer deformed.After simple repair,it can meet the requirements of the replacement working face mining.
layered mininglower layer roadway along the goafdense drillingsurrounding rock deformation