Chemically Induced Changes in the Shear Behaviour of Interface Between Rock and Tailings Backfill Undergoing Cementation
Chemically Induced Changes in the Shear Behaviour of Interface Between Rock and Tailings Backfill Undergoing Cementation
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DOI：
10.1007/s00603-019-01757-0
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发表时间：
2019-09-01
影响因子：
6.2
通讯作者：
Fall, Mamadou
中科院分区：
文献类型：
--
作者：
Fang, Kun;Fall, Mamadou
尾矿是采矿活动产生的人造土壤。当与水泥和水混合时，它们形成称为水泥浆回填（CPB）的水泥土。 CPB 通常用于回填因矿石开采而产生的地下空腔。 CPB-岩石界面的剪切行为和阻力是地下 CPB 结构岩土工程设计的重要参数。然而，CPB 可能含有相对较高量的硫酸盐，并且尚未进行研究来调查 CPB 的初始硫酸盐含量对正在进行胶结的岩石和尾矿回填之间的界面的行为和阻力的影响。因此，本实验研究的主要目的是检查 CPB 初始硫酸盐含量（0 ppm、5,000 ppm、15,000 ppm 和 25,000 ppm）对养护早期（1 天、3 天和 7 天）CPB-岩石界面剪切行为的影响。所得结果表明，对于 1 天的早期样品，硫酸盐含量的增加会降低 CPB-岩石界面的剪切强度，而对于固化时间较长（7 天）的样品，硫酸盐可以对界面的剪切强度产生积极或消极的影响，具体取决于硫酸盐含量。
Tailings are man-made soils generated by mining activities. When mixed with cement and water, they form a cemented soil called cemented paste backfill (CPB). CPB is commonly used to backfill underground cavities created by ore extraction. The shear behaviour and resistance of the CPB-rock interface are important parameters for the geotechnical design of underground CPB structures. However, CPB can contain a relatively high amount of sulphate, and no studies have been performed to investigate the effect of the initial sulphate content of CPB on the behaviour and resistance of the interface between rock and tailings backfill that is undergoing cementation. The main objective of this experimental investigation is to, therefore, examine the effects of the initial sulphate content (0 ppm, 5,000 ppm, 15,000 ppm, and 25,000 ppm) of CPB on the shear behaviour of the CPB-rock interface at the early ages of curing (1 day, and 3 and 7 days). The obtained results show that, for samples at a very early age of 1 day, an increase in the sulphate content reduces the shear strength of the CPB-rock interface, whereas, for those cured for a longer period of 7 days, the sulphate can either positively or negatively affect the shear strength of the interface depending on the sulphate content.