Mechanical properties and damage constitutive model of lithium slag-cement-tailings cemented backfill under impact loading
XUE Zhenlin1, 2, ZHANG Kun1, 2, ZHANG Youzhi1, 2, GAN Deqing1, 2, LIU Zhiyi1, 2, SUN Lingzhi1, 2
(1. School of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063200, China;
2. Mine Green Intelligent Mining Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China)
Abstract：Lithium slag, a novel type of solid waste with potential cementitious activity, can be efficiently utilized when co-processed with tailings to produce backfill. To investigate the mechanical properties and damage evolution behavior of lithium slag-cement-tailings cemented backfill under dynamic impact, backfill with varying ratios of lithium slag, cement, and tailings were prepared. The mechanical properties and damage evolution were analyzed using a separated Hopkinson pressure bar apparatus. A new modified damage constitutive model for lithium slag-cement-tailings cemented backfill was established based on the Weibull model, incorporating a correction coefficient (k). The results indicate that the incorporation of lithium slag enhances the dynamic compressive strength of the cemented backfill. Notably, as the lithium slag content increases, the dynamic compressive strength of the backfill initially rises, reaching a peak at 20% lithium slag content, before subsequently decreasing. The damage evolution of the lithium slag-cement-tailings cemented backfill can be categorized into three stages: the slow growth stage, the accelerated growth stage, and the rapid growth stage of damage. The primary role of lithium slag is to increase the strain during the slow growth stage. The newly established modified damage constitutive model significantly reduces the prediction error by over 50% compared to the previous model and accurately represents the stress-strain behavior of the lithium slag-cement-tailings cemented backfill during the failure stage. These findings provide a theoretical foundation for the application of lithium slag in filling mining operations.
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2025, Vol. 44 
