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首页> 外文期刊>Journal of the South African Institution of Civil Engineers >Shear wave velocity of gold tailings
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Shear wave velocity of gold tailings

机译：金尾矿的剪切波速度

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摘要

To evaluate the liquefaction potential of tailings impoundments, the in situ void ratio and the effective stresses are required. While stresses can be estimated with relative accuracy, the void ratio of tailings has proved difficult to obtain, especially below the water table. The development of in situ seismic techniques has presented new opportunities to determine the in situ void ratio of geomaterials. In addition, these seismic methods can be used to evaluate the liquefaction potential of gold tailings. However, the method currently relies on the shear wave velocity-void ratio relationships developed for sands, while gold tailings is essentially a silty material. This raises the question of the validity of such relationships for tailings material. A triaxial apparatus was modified to accommodate bender elements and the shear wave velocity of gold tailings was determined at various void ratios and effective stresses. The results show that there is a relationship between void ratio and the normalised shear wave velocity of gold tailings. They also show that the shear wave velocity for gold tailings is more sensitive to changes in effective stress than to changes in void ratio and that the shear wave velocity is virtually independent of the overconsolidation ratio. Application of the shear wave velocity-void ratio relationship in conjunction with critical state theory indicates that at the same shear wave velocity, gold tailings have a lower susceptibility to liquefaction than sands.
机译：为了评估尾矿库的液化潜力，需要原位空隙率和有效应力。虽然可以相对准确地估算应力，但事实证明很难获得尾矿的空隙率，尤其是在地下水位以下。现场地震技术的发展为确定土工材料的现场孔隙比提供了新的机会。此外，这些地震方法可用于评估金尾矿的液化潜力。但是，该方法目前依赖于为砂子开发的剪切波速度-空隙比关系，而金尾矿本质上是粉质材料。这就提出了这样的关系对于尾矿材料有效性的问题。修改了三轴设备以容纳弯曲元件，并在各种空隙率和有效应力下确定了金尾矿的剪切波速度。结果表明，空隙率与金尾矿归一化剪切波速度之间存在一定的关系。他们还表明，金尾矿的剪切波速度对有效应力的变化比对空隙率的变化更敏感，并且剪切波速度实际上与超固结比无关。结合临界状态理论应用剪切波速度-空隙比关系表明，在相同的剪切波速度下，金尾矿的液化敏感性比砂子低。

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