Abstract: This paper has conducted a comprehensive analysis on damage deformation characteristics of coal containing gas and working face coal stress environment based on coal containing gas mechanics experiment. The fuzzy comprehensive analysis method is used, and influencing factors and its significance of dilatancy is determined in the working face coal seam. Using the Binary Choice Model, dilatancy prediction discriminant model in working face is built. The results show that mining stress, compressive strength and the original rock stress are the key influence factors of coal mass dilatancy in working face. And mining stress is the main control factor in these three factors, so reducing mining stress is the most effective way to control deep coal dilatancy. A new method of dilatancy prediction is founded based on Binary Choice Model, the mining stress being the main control factor. Consequently, the purpose for effective predicting and controlling dilatancy in working face coal is achieved.

Key words: coal mass dilatancy, influencing factors, significance, dilatancy prediction