Floor Heave Causes and Prevention Countermeasures of Mine Preparation Roadway in Deep Mine

According to the floor heave problem of the deep roadway floor in TaoDer Mine, based on the deformation failure mechanism of the mine roadway surrou nding rocks, with the theoretical analysis on the factors affected to the floor heave of the mine roadway, the surrounding rock properties, water, mining depth, geological structures and support mode would be main factors to cause the floor heaves.The grouting bolt and the grouting anchor was provided individually to control the shallow strata and the surrounding rock in the deep mine in order to make the floor strata to form the bearing beam, to improve the cohesion and internal friction angle of the ro ck strata and to increase the integrated stability of the floor.A support trial was conducted in the railway gateway of the south mining block.The results showed that the r oof and floor convergence was less than 300 mm and the floor heave was taken about 70% of the roof and floor convergence, which was reduced 80% than previous su pport system.Meanwhile the deformation of the two side walls was effectively controlled.