粗粒级膏体充填材料静动态抗离析性能表征  

Static and dynamic anti-segregation property characterization of coarse-grained paste backfill slurry

作　　者：李红[1,2] 吴爱祥[1,2] 王洪江[1,2] 彭乃兵[1,2] 王恒[1,2] 焦华喆[3] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083 [3]河南理工大学土木学院,河南焦作454000

出　　处：《中南大学学报（自然科学版）》2016年第11期3909-3915,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51374034;51304011;51374035);国家"十二五"科技支撑计划项目(2012BAB08B02)~~

摘　　要：为表征粗粒级膏体充填材料的抗离析性能，基于固液两相流体力学及非牛顿流体力学，对粗颗粒的静动态受力进行分析，构建膏体充填料浆静动态抗离析力学模型。综合考虑浆体屈服应力、粗颗粒粒级分配和固液密度，提出抗离析性能表征模型，即离析判定值M。为检测该模型，以料浆浓度、粗颗粒最大粒径、尾碎比为三因素，进行9组正交实验，并对实验结果进行拟合分析。研究结果表明：离析判定值 M 的预测结果与实际结果一致，其中，M的最大值Mmax和M的平均值Mavg的拟合复相关参数均达到0.9以上，模型具有可靠性。合理选取粗颗粒粒径计算标准，即可实现对粗粒级膏体料浆抗离析性能的准确预测。建议离析判定值Mavg为1.0-2.5，离析判定值Mmax为1.0-1.2。To characterize the anti-segregation property of coarse-grained paste backfill slurry, two mechanical models were deduced from the force analysis of coarse particles in both static and dynamic slurry based on the solid-liquid two phase fluid mechanics and the non-Newtonian fluid mechanics. After considering the yield stress of paste slurry, grain size distribution of coarse particles and density of both the solid and liquid, an indexM and its formula were developed to characterize the anti-segregation property of coarse-grained paste backfill slurry. To verify this index, nine orthogonal experiments were carried out with the three factors, i.e. slurry concentration, the maximum size of coarse particles and the tailing-gravel ratio, and fitting analysis of the results were conducted. The results show that the predicted outcomes of anti-segregation indexM are consistent with the actual results. Specifically, the fitting multiple correlation parameters of Mmax andMavg both exceed 0.9, thus the model ofM is tested to be reliable. The anti-segregation property of coarse-grained paste backfill slurry can be predicted accurately with the index ofM if the coarse particle size is suitable. Besides, the recommended value of indexMavg is 1.0 to 2.5 and indexMmax is 1.0 to 1.2.

关 键 词：膏体充填 抗离析指标 剪切阻力 屈服应力 振动离析率 

分 类 号：TD853[矿业工程—金属矿开采]