全尾砂胶结充填体早期强度特性试验研究

Experimental Study on Early Strength Characteristics of Full Tailings Cemented Filling Body

以某金属矿山全尾砂、水泥制备成的胶结充填体为研究对象,对充填体早期强度与灰砂比和料浆浓度之间的关系进行了研究。试验结果表明:全尾砂中0.075mm以下颗粒所占比例达48.38%,中值粒径为0.068mm,加权平均粒径为0.097mm,全尾砂属于细砂;灰砂比越小或料浆浓度越低,充填体的弹性模量会越小;在残余承载阶段,灰砂比越小或料浆浓度越低,会导致充填体的延展性越强,应力下降越缓慢;充填体灰砂比的减小或料浆浓度的降低皆会使其早期强度降低,充填体的灰砂比对充填体早期强度的影响更大,充填体早期强度对灰砂比的敏感程度更高。

In order to study the relationship between the early strength of filling body with cement-sand ratio and slurry concentration, the full tailing cemented filling body prepared by full tailings in metal mine and cement was taken as the research object. The results showed that the proportion of particle below 0.075 mm in the full tailings was up to 48.38%, the median diameter was 0.068 mm, and the weighted average particle size was 0.097 ram. Thus, the full tailings belonged to fine sand. The smaller the cement-sand ratio or the lower the slurry concentration, the smaller the elasticity modulus of the filling body. In the residual bearing stage, the smaller the cement-sand ratio or the lower slurry concentration, the stronger the ductility of the filling body and the slower the stress drop. The decrease of cement-sand ratio of filling body or the slurry concentration would result in the reduction of early strength. The cement-sand ratio had a greater effect on the early strength of the filling body, and the early strength of backfilling had a higher sensitivity on cement-sand ratio.