Study on fire prevention technology with grout consolidation at mining terminal line of coal mining face in steep inclined seam

in order to solve the linear fovw phenomenon of the grout occurred in the grouting and fire prevention period of the steep inclined seanm,the mheology features of he loess grout with different cuality and density were tested in the lab. The loess grout with a water and loess quantity ratof 4 ∶ 1 was added with diferent density grout consolidation materal. The water retention rate of the grout consoli ation material as vl as the theocgy features and the setlement rate of the mixture sclution were tested. A grouting sintulaton experiment vas conducted and a grouting fre preventio industialtest was conducted on the mining teminal line of No.工1024 and Nc.Ⅱ1025 coal mining face in Taoyuan Mine The resuts showed tat the scluton of the conventional loess grout was sinia to Newtonian fuid . Nthen the gr:ut consoldation material was added,the viscosity of the loess grout would be increased. When the qcuanit fracion of the grout consolidation materal eached 0.8%.themixture soludion woud become a pseudo plasic fuid with a yielcing value. The analysis on the comprehensive water retention rate and the settementrate showed thatwhen the quantityfraction of the grout consolidation materal was 0.2%~4.8%.the grout cosolidsaton materal efect would be bestiThe inteval of the materal one sutable for the site test was 15 m.