尾砂充填料浆静态沉降过程的现象及其机理

Phenomenon and mechanism of settlement process of tailings backfill slurry

为研究尾砂充填料浆的静态沉降过程相关现象与规律,采用某矿山分级尾砂与溢流细沙配置的一定级配特性的骨料,进行了不同浓度与配比的尾砂充填料浆静态沉降试验。通过对实验现象以及试验所得数据进行观察与分析,得出了料浆最终沉降浓度与初始浓度正相关,料浆形成的固结体在不同高度上孔隙率、含水率以及颗粒粒径差异均将影响最终充填体强度均匀性的结论。同时,初步分析得到了静态沉降过程引起粗细物料颗粒分离的机理,即粗细物料颗粒分离现象主要受物料颗粒间的干扰沉降以及孔隙水泌出产生的渗透力带走细物料颗粒的作用所影响。

In order to study the phenomena and regularities of static settlement process of tailings backfill slurry,a kind of aggregate with specific particle size distribution（DSP）has been prepared by using a mine＇s underflow coarse tailings and overflow fine tailings.And sires of static settlement experiments of tailings slurries with different water binder ratios and concentrations have been done by using the aggregates.By observing the phenomena and analyzing the results of experiments,the conclusion that the final settlement concentration of slurry is positively correlated with the initial concentration has been made.And it has also been found that porosities,moisture contents and particle size differences of consolidated tailing bodies are all factors that will affect the strength uniformity of backfill bodies.The mechanism of segregation of aggregates caused by static settlement processes has been found at the mean time.Namely,the segregation of coarse and fine aggregates is mainly determined by the hindered settlement processed of particles and the movements of fine aggregates caused by seepage force of bleeding water.