According to the new structure of the jet flotation column, a system which can measure and control the parameters of the column flotation system is successfully
Artificially ground freezing (AGF) is one of the main methods to establish temporary support for shaft sinking in unstable water bearing strata. Domke(1915) for
The paper describes mechanical properties and deformation features of shaft adjoining rocks in gliding tectonic ground and presents the shaft-fupporting procedu