Abstract: In order to solve the problem of instability of working face caused by coal body breakage in roadway,the author used inorganic chemical material FSS to carry out grouting reinforcement experiment on coal body.The results show that FSS has high compressive and shear strength and good grout permeability after bonding with coal and rock mass.It can penetrate into the cracks of coal and rock strata very well.When the spacing of grouting holes is 1.5 m,it can achieve good filling and reinforcing effect.The crushed coal in 1501 working face is strengthened by FSS,which greatly improves the integrity and stability of coal body,reduces the possibility of roof fall accident in working face and guarantees the safety of workers on site.

Key words: Grouting reinforcement, Inorganic chemical materials, Roadway reinforcement, Broken coal