| Active changes have taken place in the supply of energy structure by advancing technologies and applying 5G technique.With the innovation of coal mining technology,coal mining urgently needs to transform to the direction of unmanned and intelligent.In the past,when advanced support was carried out,the single hydraulic support with high demand for labor intensity was mostly adopted.However,because of the disadvantage of the slow speed of support operation,the mining efficiency of the working face was indirectly affected,so it was urgent to innovate and optimize the support technology.Accordingly,Panel Working Face 153,No.2 well in Sihe Mine is selected as the experimental area in this thesis,the fore-poling technology for wall rock for roadway with thick and tight roof is studied,the active support technology by replacing single hydraulic prop with anchor cable for fore-poling is raised,enlightening the inspiring thoughts to intelligently mine the working face,and the following results are realized:(1)The stress distribution law of roadway fore-poling influenced by mining is explored by means of methods involving theoretical analysis idea,site observation mode and numerical modeling technique.The problems like abundant bottom drills and difficult withdrawal are resolved while conducting fore-poling operations on single hydraulic prop for the working face used previously,the anchor cable is proposed to be used to supersede the single hydraulic prop for supporting and suppressing the deformation of wall rock for roadway in the fore-poling segment for the roadway on Working Face 153307.(2)This paper sets up the mechanical model for roadway support in unilateral gob,and conducts the calculation and checking on appropriate advance supporting intensity of stopping tunnel,with the aim of offering theoretical foundation for anchor cable forepoling solution for stopping tunnel.This paper builds the numerical simulation model according to geological conditions on the site of Sihe No.2 Well in accordance with a certain proportion,and based on this,the preliminary advance supporting parameters are determined.(3)This paper calculate the supporting intensity of the roadway roof on both sides of the wall rock in combination with geological conditions of the mine on the basis of fore-poling parameters obtained by numerical simulation,and it is concluded that active fore-poling technology is eligible to meet support requirements by virtue of comparing the supporting intensity before and after fore-poling optimization.(4)According to the mine pressure monitoring results,it is conclusively finalized that no anchor cable suffers from fracture or anchoring failure with the anchor cable in replacement of single hydraulic prop,and reinforcing anchor cable is capable of effectively exerting proper shoring effect,effectively restricting the deformation of fore-poling wall rock in the roadway.The paper has 55 pictures,10 tables,and 90 references. |
PDF Full Text Request