The dry stacking of filtered tailings has emerged as an alternative way of dealing with the safety-related problems of conventional slurry disposal in reservoirs behind upstream dams. Incorporating a cementing agent into the tailings before compaction can enhance the overall geomechanical behaviour of these structures, giving rise to more stable and safer stackings. However, few dry stacks are in operation worldwide and their field performance needs to be better understood. In addition, the addition of cement provides further challenges to the design of these structures. Obtaining reliable laboratory data for properly designing these tailings storage facilities is thus essential. Accordingly, the mechanical behaviour of artificially cemented iron ore tailings for dry stacking purposes was evaluated, with a focus on comparing the responses between field-compacted samples and laboratory-assembled specimens. To do this, ultrasonic pulse velocity, unconfined compression, split tensile and triaxial compression tests were carried out. Both the stiffness and strength data were well described by the porosity/cement index and, despite minor differences, good agreement was found between the responses of the laboratory-assembled and field-compacted samples. The findings highlight the adequacy of laboratory procedures for reflecting the material's real-field conditions.

中文翻译：

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铁矿石尾矿-干堆用波特兰水泥混合物的现场和实验室研究

过滤后的尾矿干堆已成为解决上游大坝后面水库传统泥浆处理安全相关问题的替代方法。在压实之前在尾矿中加入胶结剂可以增强这些结构的整体地质力学性能，从而使堆垛更加稳定和安全。然而，全球范围内投入运行的干堆很少，需要更好地了解其现场性能。此外，水泥的添加给这些结构的设计带来了进一步的挑战。因此，获得可靠的实验室数据对于正确设计这些尾矿储存设施至关重要。因此，对用于干堆的人工胶结铁矿石尾矿的力学行为进行了评估，重点是比较现场压实样品和实验室组装样本之间的响应。为此，进行了超声波脉冲速度、无侧限压缩、分裂拉伸和三轴压缩测试。孔隙率/水泥指数很好地描述了刚度和强度数据，尽管存在微小差异，但实验室组装样品和现场压实样品的响应之间存在良好的一致性。研究结果强调了实验室程序足以反映材料的真实现场条件。