Experimental Study on the Influence of Graded Incremental Loading on Consolidation Creep of Fine Tailings
As the particle size of the tailings is getting finer and finer,a large number of discharged tailings have significantly accelerated the speed of dam construction,further exacerbating the problems of slow consolidation of tailings in the reservoir and continuous reduction of dam stability.If not controlled,it will lead to the occurrence of dam failure.The strain-time-stress relationship curves of fine-grained tailings with different particle sizes were analyzed by a one-dimensional confined consolidation compression test,and the corresponding creep model was established to further study its creep characteristics.The results show that the strain-time curves of fine-grained tailings under different stresses show obvious nonlinear characteristics.Under the action of load,fine-grained tailings produce instantaneous deformation.It can be considered that the deformation rate of tailings is in-finite at the initial stage of loading.An empirical model that can describe the creep characteristics of fine-grained tailings with different particle sizes under a one-dimensional confined state is established.Through com-parative analysis,it can be seen that the finer the particles of tailings,the greater the change of deformation with time.The research results can provide a good research basis for the creep effect of tailings dams under long-term load,and can well explain the reasonable creep constitutive relation to guide the engineering practice of tailings dams.
fine tailingstailings dam projectcreep effectgraded loadingfine grained tailings strain
万方数据
维普
