Canadian Geotechnical Journal, Ahead of Print.
The mechanics of filtered compacted normally consolidated (NC) and overconsolidated (OC) iron ore tailings (IOTs) was studied by performing triaxial testing at high pressures of up to 120 MPa. The OC specimens were obtained by isotropically compressing compacted IOT to 120 MPa, unloading it to distinct confining pressures, and shearing at constant radial stress. Particle size distribution analyses were used to examine the effect of compression and shear stresses on particle breakage. Additionally, the triaxial test results illustrate the stress history influence on the deviatoric stress–axial strain–volumetric strain curves, as well as on the IOT peak strength. Furthermore, these results also show that the amount of breakage during the shearing stage plays an essential role in the geomaterial’s response, marking the existence of curved critical state locus in both v–ln p′ and q– p′ planes, which is unique in the studied confined stress range (4–120 MPa) for the compacted NC and OC (considering OC ratio up to 30) IOTs.

中文翻译：

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高压过滤压实固结和超固结铁矿尾矿的力学

加拿大岩土工程杂志，印刷前。
通过在高达 120 MPa 的高压下进行三轴测试，研究了过滤压实正常固结 (NC) 和超固结 (OC) 铁矿石尾矿 (IOT) 的力学特性。OC 样本是通过将压实 IOT 各向同性压缩至 120 MPa、将其卸载至不同的围压并在恒定径向应力下进行剪切而获得的。粒度分布分析用于检查压缩应力和剪切应力对颗粒破碎的影响。此外，三轴测试结果说明了应力历史对偏应力-轴向应变-体积应变曲线以及IOT峰值强度的影响。此外，这些结果还表明，剪切阶段的破碎量在岩土材料的响应中起着至关重要的作用，标志着v-ln p′和q-p′平面中都存在弯曲的临界状态轨迹，这在岩土材料中是独一无二的。研究的压实 NC 和 OC（考虑 OC 比率高达 30）IOT 的受限应力范围 (4–120 MPa)。