Abstract

Tailing is an artificial waste material that is created after the extraction of a metal from mineral soils that seriously need to be investigated in various aspects, including from geotechnical engineering point of view. These silt sized materials are mostly influenced by the strain rate effects. For this, a series of triaxial testings has been perfomed on reconstituted saturated zanjan zinc tailing specimens. The tests were done under two confining pressures of 50 and 200 kPa with a relative density of 73% at four different strain rates of 0.5, 0.3, 0.1 and 0.05 mm/min. The testing results showed that as the strain rate increases 10-fold, the amount of the maximum deviator stress increases 1.90 and 1.33 times on average for CU and CD conditions, respectively. Also in both conditions, the higher the strain rate, the higher the friction angle. Moreover, the results showed that with increasing the strain rate, the values of pore water pressure decreased by 0.6 times. By reducing the strain rate 10 times, the volumetric strain increases 3 times on average. It was concluded that the strain rate has effective influence on the shear behavior of the zanjan zinc tailing.

摘要

尾矿是一种人工废料，是从矿质土壤中提取金属后产生的，需要从各个方面进行研究，包括从岩土工程的角度进行研究。这些淤泥大小的材料主要受应变率效应的影响。为此，对重构的饱和赞詹锌尾矿样本进行了一系列三轴测试。测试是在 50 和 200 kPa 的两个围压下进行的，相对密度为 73%，四种不同的应变速率为 0.5、0.3、0.1 和 0.05 mm/min。测试结果表明，随着应变率增加 10 倍，对于 CU 和 CD 条件，最大偏应力的量平均分别增加 1.90 和 1.33 倍。同样在这两种情况下，应变率越高，摩擦角就越大。此外，结果表明，随着应变速率的增加，孔隙水压力值降低了 0.6 倍。通过降低应变率 10 倍，体积应变平均增加 3 倍。得出的结论是，应变率对赞詹锌尾矿的剪切行为具有有效影响。