In response to the issue of the mechanical properties of high-sulfur tailings cemented filling materials deteriorating easily, this study developed a slag-based high-sulfur tailings cemented filling body using high-sulfur full tailings sourced from a specific metal mine, along with cement and blast furnace slag as raw materials. The study employed uniaxial compression tests to investigate the stress-strain response, energy evolution, failure mode, and intensity fitting relationship of the filling body. Additionally, scanning electron microscopy(SEM) was utilized to characterize its microstructural features. The research examined the effects of three variables cement sand ratios, slurry concentration, and curing age on the performance of the filling body. The findings indicate that when the cement sand ratio exceeds 1∶6, the compressive strength of the filling body improves with an increase in the cement sand ratio, slurry concentration, and curing age. Notably, the cement sand ratio exerts the most significant influence. When the cement sand ratio is ≤1∶6 and the curing period is extended from 28 to 60 days, a decline in strength is observed, attributable to the oxidative erosion of sulfur components. The peak strain diminishes with reductions in both the slag-to-sand ratio and slurry concentration. The failure mode of the filling material predominantly exhibits tensile failure. Energy analysis reveals that as the slag-to-sand ratio and slurry concentration decrease, there is a weakening in peak pre-energy storage capacity, and the proportion of dissipated energy during the failure phase increases. Through fitting analysis of the three factors and strength, the logarithmic model fitting demonstrates superior efficacy, with the sensitivity of strength to these factors ranked as follows: cement sand ratiocuring ageslurry concentration. Scanning Electron Microscopy(SEM) analysis indicates that the formation of calcium silicate hydrate(C-S-H) gel and ettringite(AFt) crystals enhances structural density. However, excessive precipitation of expansive hydration products under prolonged curing conditions induces microcrack expansion, leading to strength deterioration. The research results can provide a reference for the selection of ratio parameters of slag-based high-sulfur tailings cemented filling materials.
图7所示为B-2、B-5、B-6、B-7、B-8和B-10试件的能量耗散曲线。从整体变化趋势看,弹性应变能曲线与应力—应变曲线高度一致,反映能量的加载—储能—释放过程;耗散能呈现“平缓—缓慢增加—快速增长”阶段变化。在初始加载时,总应变能曲线与弹性能曲线重合,外部输入的能量主要用于压实试件内部的孔隙与微裂纹。随着载荷的增大,总应变能曲线呈现向上凹的增长趋势,充填体吸收的能量主要以弹性应变能形式存储。需要指出的是,在本阶段因采用初始弹性模量替代实际卸载模量计算弹性应变能,导致耗散能出现轻微负值偏差(Yin et al,2022),但并未改变整体能量演化趋势。当载荷进一步增加,总应变能曲线趋于近似直线增长,弹性能曲线向上凸起,达到试件的最大储能极限。当峰值应力被突破,弹性能迅速释放,耗散能急剧上升。
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