Abstract: In order to analyze the effect of slurry grouting support for roadway roof in steeply inclined layered rock mass,ABAQUS software was used to establish the numerical analysis models of regular slurry grouting,expansive slurry grouting reinforcement and nongrouting of the roof bedding surface.The variation characteristics of the displacement,stress and plastic strain of roadway roof under different grouting conditions were compared and analyzed.The similarity simulation test of roof grouting in steep layered rock roadway was carried out,displacement and stress monitoring points corresponding to numerical simulation were set in the similar test model,the variation characteristics of roof displacement and stress after regular slurry grouting and expansive slurry grouting were compared and analyzed.Combined with similar simulation test phenomenon,the grouting reinforcement mechanism of expansive slurry was analyzed.The results showed that the vertical displacement of roof under the conditions of regular grouting and expansive grouting was reduced by an average of 19.7% and 30.2% respectively compared with nongrouting,and the vertical stress was 18.4% lower than that of regular slurry grouting on average.In the similar simulation test,the variation law of roof displacement and internal stress was consistent with the numerical simulation.The bearing capacity and deformation resistance of the roof after expansive slurry grouting were stronger,and the displacement and stress of the roof after loading were smaller than those under regular grouting.The study results further indicated that the expansive slurry had a good support effect for the roof grouting reinforcement of roadway in steeply inclined layered rock mass.

Key words: steeply inclined rock mass,expansive slurry grouting,roadway surrounding rock,stress distribution,roof displacement