Abstract: Aimed at the problems of fine grain size of unclassified tailing and high costs of consolidation and backfill,the influences of the new curing agent to unconfined compressive strength of unclassified tailings cemented materials are studied.The study results show that:when the solid concentration are 65%,68%,70% respectively and the cement sand ratio is 1∶8,the compressive strength of the new curing agent samples cured for 28 d are 2.556,3.3333.842 MPa respectively,the compressive strength of the samples suing new curing agent are increased 650%,520%,461% than that of the cement samples;when the solid concentration is 70%,the cement sand ratio is 1∶10 and the curing age are 3,7,28 d,the compressive strength of the new curing agent samples are 1 454,2.983,3.842 MPa,the compressive strength of the samples using new curing agent are increased 516%、665%、461% than that of the cement samples;when the the solid concentration is 70%, the curing age is 28 d and the cement ratio are 1∶10,1∶9,1∶8,the compressive strength of the new curing agent samples are 2.076,2.738,3.842 MPa,the compressive strength of the samples using new curing agent samples are increased 382%,449%,461% than that of the cement samples.The new type of curing agent can meet the mine backfilling materials requirements,besides that,the deficiencies of low strength and high costs of the unclassified tailings cemented materials are also overcomed by adopting the new type of curing agent.

Key words: Copper mine, Low grain size, Unclassified tailings, Cementation, Backfilling, Unconfined compressive strength