Coal field bottom plate grouting prevention and control method based on water-soluble fluorescent agent

The invention provides a coal field bottom plate grouting prevention and control method based on a water-soluble fluorescent agent. The coal field bottom plate grouting prevention and control method comprises the steps that step A, cement grout containing the fluorescent agent is prepared; step B, a first branch hole is constructed in a drilling site, and grouting plugging is conducted; step C, second branch holes are constructed around the first branch hole, and when drilling is conducted to a three-ash area, drilling is conducted in the direction of a center branch hole at a certain inclination angle; step D, when the fluorescent agent is detected, a drilling position is marked; step E, a grout diffusion radius is determined according to a linear distance between the drilling position and the center branch hole, and drilling continues to be conducted according to an original path or a position of a second branch hole is determined again; and step F, other branch holes are constructed according to the diffus