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As the coal resource exhausted increasingly in shallow mining area, the main coal resource will be from deep mining. In the construction of deep coal mine, complicated roadway group system is composed compactly by rock roadways like airway, pathway, haulageway, which are the main ways to mining area. The basic contradiction between high crustal stress and low rock strength is the basic root of global stability problem after excavation. Taking the global stability of deep roadway group as research target, the user-defined constitutive model and numerical recipes software as measure, this paper analyzes the global stability from layout method, excavation sequence and support optimization. The main research work and contributions are as follows:1) First, this paper makes the date of large deformation rock test form deep coal mine and obtains the relation of intensity parameter, confining pressure and equivalent plastic strain. A progressive failure constitutive model is established,which can reflect post-peak hulking deformation of deep soft rock. The model is derived and numerical computational function and model validity are proceed by using FLAC3D.2) Second, it analyzes the global stability from layout method, excavation sequence and support optimization, getting the most optimal layout, reasonable excavation scheme, support pattern and opportunity.3) Third, taking the east roadway group at-960m level of Zhuji coal mine in Huainan area as an example, the paper researches the support method under the disturbance of adjacent roadways excavation on the basis of the first two chapters’research. The validity of support method is proved both from theroy and practice by numerical calculation and field monitoring.
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