The floor heave of conventional gob-side entry retaining is more serious in the stage of primary mining and retaining.In order to optimize the stability of gob-side entry retaining with roof cutting and pressure relief in deep mine,this study focuses on the evolution law of floor heave in the whole life cycle and puts forward prevention and control strategies.Based on the 360606 working face of Xinji No.1 Coal Mine in Huainan,the theoretical analysis, mechanical modeling and FLAC3D numerical simulation are used to carry out the research.The theoretical analysis reveals the mechanism of floor heave in each stage.Due to the redistribution of stress in the excavation stage,the amount of floor heave is 118 mm.In the first mining stage,under the influence of abutment pressure,the amount of floor heave increases to 351.6 mm;in the second mining stage,the basic bottom is bent and unstable,and the amount of floor heave is 836.9 mm.The numerical simulation shows that the vertical stress peak reaches 44 MPa during the secondary mining,and the plastic zone expands to 40 m ahead of the working face.The high stress concentration and the expansion of the plastic zone aggravate the floor heave.Based on this,a ' lead-lag-stability ' phased cooperative control strategy is proposed,and the roof cutting parameters are determined to optimize the stress field.After the field application,the floor heave is reduced to 628 mm,which is 20.5 % lower than the theoretical value,which effectively controls the deformation of the roadway and improves the stability of the roadway.The research results provide theoretical and practical basis for floor heave control of gob-side entry retaining.