The filtered tailings disposal (dry stacking) up to 300 m high is an alternative to overcome the drawbacks related to the slurry tailings storage in large impoundments as it is safer and demands smaller portions of the existing landform. Even so, the understanding of the denser and dewatered material response over a broad range of confining pressures is essential to safely design tall dry stacking tailings facilities. Accordingly, the present research assesses the mechanical behavior of compacted iron ore tailings through triaxial tests. A series of compression and extension drained and undrained triaxial tests were conducted over a wide spectrum of confinements (σ ranging from 75 to 8,000 kPa) to check possible particle breakage occurrence and effects. The influence of the initial density due to compaction was, as well, evaluated since the tests were performed using specimens molded at distinct dry unit weight values. The results were analyzed in the light of the critical state soil mechanics and have indicated the existence of a curvilinear critical state line in the ν: log plane. Small particle breakage has occurred and can be associated with reduction in surface roughness, breakage of asperities, and reduction in particle angularity. Moreover, a tendency for static liquefaction was observed amongst the loosest specimens sheared under the lowest confining levels.

中文翻译：

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考虑广泛围压的压实铁矿石尾矿的三轴测试响应

高达 300 m 的过滤尾矿处置（干堆）是克服与大型蓄水池中浆料尾矿储存相关的缺点的替代方案，因为它更安全并且需要较小的现有地形部分。即便如此，了解在广泛的围压范围内致密和脱水材料的响应对于安全设计高层干堆尾矿设施至关重要。因此，本研究通过三轴试验评估压实铁矿尾矿的力学行为。在广泛的限制范围（σ 范围为 75 至 8,000 kPa）下进行了一系列压缩和拉伸排水和不排水三轴试验，以检查可能发生的颗粒破碎及其影响。由于测试是使用以不同的干单位重量值模制的样品进行的，因此还评估了压实对初始密度的影响。根据临界状态土力学对结果进行分析，表明在ν：对数平面中存在曲线临界状态线。已经发生小颗粒破碎，并且可能与表面粗糙度的降低、粗糙体的破碎以及颗粒棱角的降低有关。此外，在最低限制水平下剪切的最松散的样本中观察到静态液化的趋势。