Floor Heave Mechanism and Over-Excavation & Grouting-Backfilling Technology in Rock Roadway of Deep Mine

Based on the fact that the floor heave of soft rock roadway in deep mine is quite serious,we study factors of effectively controlling the floor heave in deep soft roadway in Wangfenggang coal mine.By numerical modeling with FLAC and in-situ measuring,we obtain the plastic region,laws of deformation and movement,and stress distribution around the roadway of which the floor is not supported.In addition,we propose a new method,the over excavation and grouting-backfilling technology,to control the floor heave.The experiment of this new method shows that good effect of floor heave controlling is obtained and the floor heave convergence is small.