Abstract: The depth, strength of surrounding rocks, pressure coefficients,intersections structure, construction methods are selected as the factors that affect the stability of large intersection construction so as to establish the fuzzy mathematical quantitative evaluation model based on entropy. Taking the intersections construction of the track lane yard of the twentieth mining area of Chengjiao coal mine and the large track lane roadway as an example,small blasting construction method,anchor cables with dark anchor cables construction method, anchor beams reinforcement method are adopted to guarantee the intersections construction smoothly. The concepts of thermodynamic entropy and information entropy are introduced to calculate the weight of each factor, so, the weight vectors of the evaluation factors are acquired so as to to conduct fuzzy comprehensive evaluation on the stability of intersections. Compared with the actual situations, the accuracy of the evaluation results are proved and the rationality of the construction method are verified. Therefore, the research results of this paper have important guiding significance to the intersections construction in the future.

Key words: Deep roadway, Large intersections, Fuzzy mathematical, Stability, Comprehensive evaluation