【摘要】 为了获得满足强度要求的充填料浆配比,对不同料浆配比的充填体强度影响特性进行研究。首先,采用Talbol理论对球磨尾砂、溢流尾砂与粗砂进行级配分析,得到混合尾砂最佳级配范围。然后,进行了料浆配比强度试验,探讨了尾砂级配、固结剂掺量和质量浓度对充填体单轴抗压强度的影响,建立强度增长规律模型,发现不同质量浓度与尾砂级配下的充填体抗压强度遵循指数增长规律,随着粗砂掺量的增加,整体强度呈现先增大然后减小的趋势。其次采用响应面法试验设计,建立了以强度为响应值的回归模型,分析了固结剂掺量、质量浓度和尾砂级配单一或交互作用对充填体强度的影响规律,结果表明:单因素在不同龄期下对充填体强度影响显著,显著性大小的顺序为:固结剂掺量（x₁）>质量浓度（x₂）>尾砂级配（x₃）;固结剂掺量与尾砂级配交互作用下对充填体强度影响显著。最后,利用RSM对料浆配比进行优化,得出达到所需强度的最优料浆配比条件为:当x₁=7%、x₂=53%、 x₃=12%,7 d强度可达到1.09 MPa,28 d强度可达到1.725 MPa。更多还原

【Abstract】 In order to obtain the filling slurry ratio that meets the strength requirements,the strength influence characteristics of filling body with different slurry ratios were studied. Firstly,Talbol theory is used to analyze the gradation of ball mill tailings,overflow tailings and coarse sand,and the optimal gradation range of mixed tailings is obtained. Then,the strength test of slurry ratio was carried out,and the influence of tailings gradation,consolidation agent content and mass concentration on the uniaxial compressive strength of filling body was discussed. The strength growth law model was established. It is found that the compressive strength of filling body under different mass concentrations and tailings gradation follows the exponential growth law. With the increase of coarse sand content,the overall strength increases first and then decreases. Secondly,the response surface method was used to establish a regression model with strength as the response value,and the influence of single or interaction of consolidation agent dosage,mass concentration and tailings gradation on the strength of backfill was analyzed,The results show that the influence of single factor on the strength of filling body at different ages is obvious,and the order of obviousness is :consolidation agent content（x₁） > mass concentration（x₂） > tailings gradation（x₃）;the influence of the interaction between the dosage of consolidation agent and the tailing gradation on the strength of the backfill is obvious;finally,RSM was used to optimize the slurry ratio,and the optimal slurry ratio conditions to achieve the required strength were obtained as follows:when x₁= 7%,x₂= 53%,x₃= 12%,the 7 d strength could reach 1. 09 MPa,and the 28 d strength could reach 1. 725MPa.更多还原