基于响应面法的废石-细尾砂充填性能优化试验

为获得满足矿山采矿强度要求的废石-细尾砂充填最佳配比，首先根据混合骨料的堆积密实度和料浆浓度初探试验，初步获得配比范围；在此基础上利用响应面法建立了以废石-细尾砂充填体的3、7、28 d抗压强度为响应值的回归模型，揭示了骨料配比、浓度和灰砂比三因素对充填体强度的影响规律，并通过回归模型优选出充填最佳配比，进行半工业试验验证。结果表明，当充填体养护至3、7 d时，浓度和灰砂比两因素的交互作用影响显著；当充填体养护至28 d时，骨料配比与浓度的交互作用影响显著。当骨料配比1∶3、浓度82%、灰砂比1∶4时，废石-细尾砂充填性能完全满足矿山的充填需求，为废石-细尾砂混合骨料膏体充填性能优化提供了理论基础。

Optimization Test of Waste Rock Fine Tailings Filling Performance Based on Response Surface Methodology

The optimization test of waste rock fine tailings filling performance based on response surface method. In order to obtain the optimal combination of waste rock fine tailings filling material with high mass fraction that meets the requirements of mining strength,the optimal ratio of waste rock fine tailings is obtained based on the mixed stacking density test of two types of aggregates and the preliminary experiment of slurry mass fraction. The response surface method was used to study the influence of aggregate ratio,mass fraction,and cement dosage on the unconfined compressive strength of filling materials at different ages. A ternary quadratic regression model was established with the 3D,7d,and 28d strengths of waste rock fine tailings cemented filling materials as response values,revealing the mechanism of the single or interactive effects of slurry aggregate ratio,mass fraction,and cement dosage on the strength of filling materials. The optimal slurry mix ratio was optimized through regression models and verified through semi industrial loop tests. The experimental results indicate that the strength of the filling body is not only affected by a single factor,but also significantly influenced by the interaction between the two factors. According to the response surface of the model,the interaction between mass fraction and cement dosage has a significant impact on the early strength of the filling body,while the interaction between aggregate ratio and mass fraction has a significant impact on the later strength of the filling body. When the aggregate ratio is 1:3,the mass fraction is 82%,and the cement dosage is 300kg/m3,the slurry flowability is good. The strength of the filling body at 3d,7d,and 28d is 2.63 MPa,4.21 MPa,and 6.09 MPa,respectively,which can meet the filling requirements of mines and provide a foundation for the transportation test and engineering design of waste rock fine tailings multiphase composite paste filling materials.