Abstract: For the tunnel affected by first mining in Yangquan mining area, the thesis designed orthogonal experiments, analyzed the results with the method of numerical simulation and optimized the supporting parameters by the means of associated analysis of grey theory. The thesis selected the orthogonal experiments which needs 18 times numerical simulation including 8 factors with 3 levels each one. According to the results, the thesis researched the tunnel stabilization and deformation in the condition of different stress and supporting parameters. During the course of simulation, the thesis considered the strength effect about surrounding rock anchorage and gave the scheme about how the anchorage effect was executed in numerical simulation. On the other hand, the thesis expounded four kinds of evaluation criterions about tunnel stabilization and deformation to determine the corresponding local optimization scheme. On this base, the thesis comprehensively considered the factors of supporting cost and difficulty of construction, analyzed the results with the method of associated analysis of grey theory and got the optimal supporting scheme of primary dynamic pressure tunnel. This research results have been put into the use of primary dynamic pressure tunnel support in Yangquan mining area; and the support effect is satisfied.

Key words: Coal mine tunnel, Primary dynamic pressure, Pre-stressed anchor, Optimization design