Abstract:In response to problems of rapid excavation of deep shafts, such as lining cracking and high support costs, based on the engineering background of -906 ~ -1158 section of an overseas copper and gold mine, the support parameters of shaft were studied by theoretical calculations, numerical simulations and field tests. In order to restrict deformation of the shaft and reduce the cost of support reasonably and effectively, a shaft model was established based on the engineering practice, the stability of surrounding rock with the different parameters was analyzed by FLAC3D numerical software combined with fluid-structure interaction. The results demonstrated that for the class III surrounding rock, "anchor net spraying + steel fiber concrete" support is adopted, and its parameters are as follows: bolt diameter 22mm, length 2.3m, shotcrete thickness 50mm, row spacing 1m×1m, steel fiber concrete thickness 550mm; For the locally existing class IV~V surrounding rock, this paper proposes to "anchor net spray + foam board + steel fiber concrete" support, and the thickness of buffer layer foam board is 100mm, and the thickness of steel fiber concrete is 600mm. Field test results show that the average convergence rate of surrounding rock is 0.18 ~ 0.31mm/d after 412h excavation, which meets the requirements of air inlet shaft construction, and the construction efficiency is improved by about 23.5% compared with the domestic deep shaft. This work can provide a guidance for the support design of shaft in soft-fractured strata with water-rich.