Grouting control method for preventing invalid diffusion of grout near goaf

The invention discloses a control method for preventing invalid diffusion of grout near a goaf, which comprises the following steps of: 1, determining the position of the goaf according to a mine mining plan, and grading the risk of invalid diffusion of grouting according to the relationship between a regional governance drill hole and the goaf; 2, for the drilled hole with the grout leakage risk, primary grouting is carried out when the distance between the drilling track and the goaf space is S1 or the distance between the drilling track and the fault plane is L; thirdly, when the space distance between the drilling track and the goaf is smaller than S1, n times of controlled grouting is conducted; when a fault surface is drilled, one-time controlled grouting is carried out; and 4, when the distance between the drilling track and the goaf space is S2 or the drilling track passes through the fault plane L, primary check grouting is conducted. According to the method, on the basis of the goaf position, grouti