High Containing Fly Ash Grouting Material Performance Test of Large Channel Underlying Goaf

Middle route of South-to-North Water Transfer Project of Yuzhou section of the mined-out area of coal mining area is old, has the characteristics of small coal mine of irregular, no mine distribution, engineering geological conditions are very complicated, decided to adopt the filling grouting treatment after analysis. Because the goaf filling grouting treatment scope, size, slurry material costs become an important factor restricting the engineering project management, and setting strength and fineness requirements of grouting material is relatively low, overall consideration the mined-out geology topography and distribution characteristics, combines with the highway, railway and other treatment of research results of mined-out area, comes up with the cement grout high containing 85% fly ash filling grouting, and provides valuable experience for similar goaf.