Abstract:Aiming at the problem of tunnel bottom drum of the underlying coal seam in the process of short-distance mining, this paper uses the method of combining numerical simulation and field monitoring to study the control method of the tunnel bottom drum of the close- distance coal seam in a mine. The results show that as the working face of the overlying coal seam advances, the stress on the roadway of the underlying coal seam first increases and then decreases, and the stress peak appears at the position 15m from the working face to the roadway, where the maximum vertical stress of the roadway is 28.5MPa, and the displacement of the roof and floor and the two sides are 195mm, 773mm and 135mm respectively, and the deformation of the roadway floor is the most serious. Based on this research, a sub-section floor drum control method is proposed, which combines the pressure relief of roadway floor cutting grooves and the strengthening support of "U-shaped steel + reverse bottom arch", and the reasonable pressure relief groove parameters are given.. Through field practice, the maximum vertical displacement of the floor in the grooved pressure relief section and the reinforcement support section of the roadway floor was reduced by 62.1% and 58.1%, respectively, realizing the effective control of the bottom heave of the coal seam roadway.