Abstract:At present, the floor heave of roadway is one of the main problems in the process of coal mining. In this paper, Fengda Coal Mine - 340 track roadway with soft floor and strong influence of abandoned old roadway is selected and verified by FLAC3D numerical simulation software and the application effect of three kinds of Roadway Floor Heave Control Technology in this roadway is discussed.: ①roadway undercover retaining groove; ②floor grouting reinforcement; ③undercover pressure relief tank + watering coagulation + grouting pipe reinforcement coupling combined support method. The method of selection is used ③ to treat the floor heave of the roadway. Engineering practice shows that the method ③ can make full use of the self-bearing capacity of roadway surrounding rock and excavate the strength of deeper surrounding rock, so that the volume of floor heave is reduced by 89.5% compared with the original support, and the effect of floor heave control is remarkable. The research provides a new idea and foundation for the study of the roadway floor heave in these similar mine.