Abstract: A copper mine ore body in Yunnan Province is soft and fractured，so it is difficult to realize mining by hole drilling.Pre-reinforcement mining-optimized scheme with chemical grouting was introduced.However，in the beginning of the experiment，it is hard to accurately control the experiment，resulting in the problems that chemical slurry was over used.In order to quantize and simplify the control process of quick-setting chemical grouting applied in the copper mine，the Grouting Intensity Number method was applied to the chemical grouting experiment for the study of fractured ore-body.The controlling standard for chemical grouting of a fractured copper mine was established and the grouting effect was detected by the drilling detector.Results showed that the industrial applications of GIN method should fully consider final pressure P_fand volume of chemical slurry V_f per meter.Furthermore，the controlling standards based on depth range of fan-pattern grouting holes were as follows：at the hole depth of from 0 to 8 m，P_f  is less than 60 MPa·L/m；at the hole depth of from 8 m to 15 m，P_f  is less than 95 MPa·L/m；at the hole depth of greater than 15 m，P_f  is less than 160 MPa·L/m.The drilling detector indicated that the diffusion radius of chemical slurry reached 2.5 m and the pore-forming effect had been significantly improved after grouting.Consequently，this study can be used to quantify the grouting control standards，simplify engineering applications and improve the stability of the fractured ore body.

Key words: Chemical grouting, Grouting Intensity Number method, Control standards, Effect testing