ABSTRACT
To dispose of the smelting slag and reduce backfill cost in the mine, the aggregate mixed with smelting slag was selected as the filling aggregate, and then the filling industrial test of smelting slag was carried out in the stopes. Through the geological coring and strength test, the in-situ cemented backfill mass had been evaluated by the comparative analysis of RQD、P-wave velocity and UCS, which proved that the gradation of filling aggregate was optimized, and the quality of in-situ cemented backfill was improved by adding smelting slag. Based on internal links of physicomechanical parameters of cemented backfill, a relation between UCS and P-wave modulus was established from the perspective of dimensional balance. According to the test data of dry density, P-wave velocity and UCS of in-situ cemented backfill, the UCS prediction formula was obtained by the linear fitting method, which provided a strong research basis for the comprehensive quality evaluation of subsequent backfill.
