Abstract: Work in the coal mine due to space constraints, large mixing and delivery device is difficult to work, so copying the existing wet spraying equipment on the ground to the coal mine does not work, and use a small mixing plant still requires a lot of manual operations , low productivity, poor stirring effect; at the same time, due to the gravel and cement are feeding together, stirring, even with a closed or semi-closed container for mixing, will generate a lot of dust, causing harm to the operator's body.In order to achieve concrete wet spraying in the coal mine, we propose a mixed wet spraying process, the article were analyzed and discussed for a variety of affecting factors of the mixed wet spraying process in the coal mine on practice, proposed to solve the problem of direction or method ,the results showing that these factors were controlled in the coal mine, or to take measures to meet the construction conditions, and achieving fine wet spray effect.

Key words: concrete wet spraying, mixed wet spraying, influencing factors