Selection and Application of the Mixed Aqueous Solution in "Three-soft" Coal Seam Heading Faces Injection

In order to reduce coal wall spalling, prevent roof caving of heading face, decrease dust producing capacity of coal body and dust degree, Pinggou coal mine applies the technology of grouting mixture which takes super face active agent and caking agent as its main ingredient in advanced deep hole of heading face. The result shows that it can effectively prevent coal wall spalling, roof caving and reduce the dust concentration of working face.