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Artificially ground freezing (AGF) is one of the main methods to establish temporary support for shaft sinking in unstable water bearin strata. Domke(1915) formula based on frozen soil strength has widely been used for desitwng bo wall thickness. However, it can not ensure the stability of freeze wall, nor guarantee the safety of Shaft consmehon as then depth increase in unstable water bearing strata F.A.Auld (1985, 1988) presented a design method of freeze wall, which is on the basis of strength and stability, together with deformation of freeze wall.He comined deformation of freeze wall, lining and deformation of bo tube to set up a Comrehensive design method for freeze wall. This paper, according to the practice in China, describes a comprehensive design method for deep freeze wail, considering influeare of excavation rate of form, unsupported length of freeze wall and the sump state on inwar deformation of freeze wall, and the allowable pipe deformation caused by inward deformation of freeze wall. Finally, successful application of this method to the large scale coal mine-Jining No.2 Mine in Shandong Province of China, is presented.It saved much investment compared with F.A.Auld’s design for the same mine on behalf of Shell Coal Intemational
Artificially ground freezing (AGF) is one of the main methods to establish temporary support for shaft sinking in unstable water bear strata. Domke (1915) formula based on frozen soil strength has been been used for desitwng bo wall thickness. However, it can not ensure the stability of freeze wall, nor guarantee the safety of Shaft consmene as then then increase in unstable water bearing strata FAAuld (1985, 1988) presented a design method of freeze wall, which is on the basis of strength and stability, together with with deformation of freeze wall. He comined deformation of freeze tube, lining and deformation of bo tube to set up a Comrehensive design method for freeze wall. This paper, according to the practice in China, describes a comprehensive design method for deep freeze wail, considering influeare of excavation rate of form, unsupported length of freeze wall and the sump state on inwar deformation of freeze wall, and the allowable pipe deformation caused by inward deformatio Finally, successful application of this method to the large scale coal mine-Jining No. 2 Mine in Shandong Province of China, is presented. It saved much investment compared with FAAuld’s design for the same mine on behalf of Shell Coal International