关键词: 斜井, 冻结法凿井, 井壁, 现场实测, 混凝土应变

Abstract: For the purpose of studying the safety of inclined shaft lining in the period of freezing sinking, variations of concrete strain and steel stress of shaft lining have been carried out based on in-situ measurement of main inclined shaft in Hami Large South Lake mine. The structure safety of shaft lining has been discussed by taking ultimate concrete tensile and compressive strain into account, besides which, several optimized suggestions have been put forward. The result has shown that variations of concrete strain could include four periods: disordered period, accelerated increasing period, slow increasing period and stable period, and the valid concrete strain should be taken into account after disordered stage. The design of inclined shaft lining should mainly be controlled by concrete tensile strain. During the construction of main inclined shaft of Hami Large South Lake mine, the maximum hoop tensile strain of floor has been up to 1 280 με, which is considerably greater than the ultimate tensile strain value, and the maximum hoop tensile strain of circular section has exceeded 200 με with the shaft lining facing the conditions of fracturing.

Key words: inclined shaft, freezing sinking, shaft lining, in-situ measurement, concrete strain