Abstract:

The comprehensive evaluation of rockmass quality was an important prerequisite and basis for the feasibility study and preliminary design of a block caving mining mine. The most usually method was the RMR system, the local RMR value of the borehole and tunnel was used to represent the qualities of all region traditionally. Based on the investigation data of Jinchuan Mine No. 3 with an elevation above 1554 m, the spatial structural quality and variability of the parameters of the RMR system were analyzed firstly. Secondly, the 3D surface model of different engineerings and lithological regions were constructed; furthermore, they were filled by numerous discrete cuboids unit. Thirdly, by using the best unbiased evaluation method for the regionalization variables, the RMR parameters of each cuboids unit were estimated, and resulted in a 3D RMR evaluation model which reflects the global variation of rockmass qualities of the Jinchuan Mine No. 3. Finally, based on the resulted model, the sustained and occurring hydraulic radius of Jinchuan Mine No. 3 above 1554 m was calculated by Laubscher’s caving chart. The result showed that the mean RMR value of the evaluation region was 39.8, the cavability ranks were good to very good; and the estimated mean sustained hydraulic radius of Jinchuan Mine No. 3 is 20.4m.

Key words: Jinchuan Mine No.3, rockmass quality evaluation, regionalization variable, cavability, cavability hydraulic radius