Abstract:   To effectively control the deformation of rocks in the large section chamber of  broken station in Jinchuan No.3 Mine，we monitored the deformation of surrounding rocks and analyzed the factors affecting such deformation，indicating that the rock mass is characterized by a low critical creep stress，a broken sheardilatation creep，and a long duration of deformation．Aiming at these deformation characteristics，we adopt the principle of “yield through leaving space and strengthening support” and put forward a comprehensive evaluation index．We also proposed an orthogonal numerical simulation test program among the three factors，designed four levels through the comprehensive evaluation index analysis，and determined a reasonable amount of yield displacement in which the gross distortion of the chamber is 90 mm，the initial lining to yield deformation is 0，and the twain support to yield deformation is 50 mm．For the safety assessment and the long term stability prediction of broken surrounding rocks，we use FBG sensors to monitor the rock deformation．

Key words:  , Jinchuan mine；large section underground cavern；yield displacement；numerical experiment；deformation monitoring