Dynamic Analysis On The Stabality Of The Freeze Shaft Lining In Thick Top Soil

The shafting lining is the main pathway between underground engineering of mine and ground surface, is the most important engineering of mine construction. So the stability of the shafting lining is the precondition of the safety of producing.Base on the a series theoretical and numerical analyses (Flac3D) and filed observation, the freezing pressure in freezing shafting lining and vertical additional force acted by drainage deposition and stress, strain in shafting lining have been researched and discussed. Using the linear regression, obtained the regression formulation of the freezing pressure. The relationship between freezing pressure and the nature, freezing temperature, lying depth of soil had been obtained. The reason, location and development of shafting lining had been obtained. The change rule of vertical additional force with drainage and change rule of stress, strain of shafting lining had been obtained. The influence of shafting lining by drainage and consolidation had been analyzed. The vertical additional force had been back analysis according to the limit strength of shaft lining, obtained the max additional force when shaft lining fracture because the drainage. The existing structural style of shafting lining and the harnessing method of failure had been evaluated. The mechanical characteristic of freezing wall and shafting lining had been analyzed. The dynamic observation system had been invented and used in practice, obtained favorable result.