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Design and Construction of the Grout Pad in High Pressure Pregrouting at Shaft Stopes

Ji Dongli(Jinggezhuang Coal Mine)  
Review is made on the results of two designs for the high pressure pregrouting at the stopes of the main shaft and the auxiliary shaft in an iron mine.One design took the geological characteristics as the basis and was strictly and scientifically made.With proper construction technical measures,it brough both good technical and economical effects to the grouting engineering.The another design was made in no consideration of practice.As a result,it brought avoidable losses to the engineering.Its failure cause are analyzed.
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