THREE-DIMENSIONAL ENERGY DISSIPATION LAWS AND REASONABLE MATCHES BETWEEN BACKFILL AND ROCK MASS

According to experimental results of four kinds of cemented backfills with the ratios of cements to tailings 1∶4,1∶8,1∶10 and 1∶12,the laws of three-dimensional energy dissipation of backfill are presented during the course of breakage. According to the characters of stress transfer and energy release in rock mass during deposit exploiting,the laws of energy release in excavated rock mass are researched;and the results show that the deeper ore body in underground is,or the bigger the elastic modulus of rock mass is,as well as the lower the Poisson′s ratio of rock mass is,the higher the energy release in excavated rock mass is. With the characters of energy dissipation in coupling action between backfill and rock mass,their reasonable matches can be explored, and the feasibility,in which the lowest ratio 1∶12 of cement to tailings can be adopted in Anqing Copper Mine, is verified. The results show that the matching coefficient K between backfill and rock mass correlates with three- dimensional geostresses,mechanical parameters of backfill and rock mass;and it is necessary to design reasonable compression strength of backfill and to realize reasonable match between backfill and rock mass under different mining conditions.