尾矿粗细颗粒分层结构体的力学特性分析

Analysis on mechanical characteristic of coarse and fine particles layered structure of tailings

利用室内三轴试验和直接剪切试验,研究尾矿粗细颗粒分层结构体的力学特性,包括尾矿粗细颗粒2层结构和3层结构,同时考虑分层厚度变化的影响。三轴试验结果显示:分层结构体的内聚力一般比单一粗粒尾矿和细粒尾矿的低,内摩擦角介于单一细粒尾矿和粗粒尾矿的之间;在2层结构中,试件的内聚力随着粗粒尾矿层厚度的增加而减小,内摩擦角随着粗粒尾矿层厚度的增加而增大;在3层结构中,粗粒尾矿作夹层时,结构体的内聚力随着夹层厚度的增加而显著减小,以细粒尾矿作夹层时,结构体的内摩擦角随着夹层厚度的增加而减小。直接剪切试验结果显示:分层结构体的内聚力和内摩擦角均比粗粒尾矿和细粒尾矿的值低。

Indoor triaxial tests and direct shear tests are adopted to study the mechanical characteristic of coarse and fine particle layered structure of railings, including two- and three-layer structures, and the influence of the change of lay thickness is taken into account. Triaxial tests results show that hierarchical structure＇s cohesions, generally, are lower than those of fine and coarse particle tailings, and internal friction angles are between the fine and coarse particle tailings＇. For the two-layer structure, the specimen＇ s cohesion reduces and internal friction angle increases with the increase of coarse particle tailings＇ layer thickness. For the three-layer structure, when the coarse particle tailing is the interlayer, the specimen＇s cohesion reduces with the increase of interlayer thickness; while when the fine tailing is the interlayer, the specimen＇s internal friction angle decreases with the increase of interlayer thickness. Direct shear testsresults show that hierarchical structure＇s cohesions and internal friction angles are all lower than those of coarse and fine particle tailings.