Abstract:In order to solve the support problem of the TBM main engine assembly chamber in a metal mine with a depth of over one kilometer, by using the methods of field investigation, laboratory test, and theoretical analysis, the failure form of the large chamber was studied comprehensively considering the deep in-situ stress. Based on the Q system method and parabolic arch method, the support method and parameters of the chamber were proposed, and the support effect was verified by the numerical simulation method. The results showed that the failure form of the TBM main engine assembly chamber was wedge collapse failure, the potential failure area was within 4.2 m of the chamber vault; the calculated Q value was 1.84, and the support method of anchor bolt + mesh + jetted concrete + long anchor cable was proposed. The numerical calculation showed that the maximum displacement of the open face was about 3 cm after the support, shear failure, and tensile failure of the roof and two sides were within the control range of the anchor cable, and the anchor cable failure didn''t occur, and the support effect was good; methods fully combined with the surrounding rock condition, deep in-situ stress condition, and chamber failure form, was suitable for the support design of deep large section chamber in metal mine