胶结充填体强度预测及水泥消耗量反演计算

Forecasting cemented backfill strength: Back calculation of cement dosage

为降低充填成本和使料浆制备系统可靠运转,基于特大型采空区充填工程对于二步骤矿柱开采的重要性,采用配比优化试验及统计分析所得的充填体长期强度预测模型,结合现场充填体地质钻探取样的检测强度,利用预测模型的变形公式,反算出采空区充填水泥实际用量,对设计与实际水泥用量的定量关系进行了分析,掌握了二者之间的偏差.结果表明:前期充填中水泥用量存在较大富余,52-8#和52-10#采场水泥用量分别偏大约60.28%,49.24%.随着充填站操作人员技术水平与熟练程度的提高,并通过对站内计量仪表和物料输送设备校验后,水泥用量的下调空间较大.

Research was done to reduce the cost of filling and to increase the reliability of the slurry preparation system. Filling is important in large sized goafs as the second step of preparing the mining props. Mixture ratio tests and statistical analysis are used to form a model to predict the strength of the fill body. Sampling from the backfilled body gave material for field verification of the model. The actual amount of cement in the goal and the cement analysis are used as predictors of deformation. The results showed that in early stages the cement fill is excessive, for example in the 52-8# and 52-10# stopes the amounts are 60.28% and 49.24% more than normal, As the technical proficiency of the filling operators increases checks of measuring instruments and the conveying equipment show reduced amounts of cement in large spaces, These results can provide a theoretical basis for reducing the cost of filling and provide guidance for additional research.