注浆加固技术在沿空掘巷中的应用探讨

Discussion on Application of Grouting Reinforcement Technology in Gob-side Entry Driving

为了解决回采过程中沿空巷道变形严重问题,对沿空掘巷护巷煤柱进行注浆加固。在煤壁侧采用上、中、下三排钻孔(上排仰斜、中下排平孔),利用水泥和化学混合浆液,按照1~2 MPa的注浆压力对护巷煤柱进行了注浆加固。通过矿压观测结果:回采过程中未注浆加固前煤壁位移约0.8 m,注浆加固后煤壁位移不足0.1 m。实践表明:通过对沿空掘巷煤柱进行注浆加固,可以提高煤柱刚性,减少回采过程中巷道两帮及顶板变形量,解决回采过程中煤柱和顶板塑性失稳问题。

To solve the serious problem of gob-side entry deformation during the mining process,chain pillars of gob-side entry driving are reinforced by grouting.With three rows of drilling holes(upper row of inclined holes,middle and lower rows of flat holes)on coal wall side,by using cement and chemical mixed slurry,the chain pillars are reinforced by grouting according to the grouting pressure of 1~2 MPa.Observation results of rock pressure show that the coal wall displacement before grouting reinforcement is about 0.8 m during the mining process,and the coal wall displacement after grouting reinforcement is less than 0.1 m,which can improve the rigidity of the coal pillars,reduce the deformation of the two sides of the roadway and the roof,and solve the problem of plastic instability of the coal pillars and roof during the mining process.