Yuqi Tan, Behrooz Ghahreman-Nejad
Machinery-induced vibrations can potentially trigger liquefaction in contractive (loose) and saturated soils and tailings. Liquefaction, if mobilised, significantly reduces the stiffness and strength of affected soils in the embankment dam or its foundation and may lead to large deformations and dam failure.
In particular, the upstream and centreline raised tailings dams are susceptible to liquefaction by cyclic loads induced by earth moving equipment during construction of embankment raises and the final capping for closure and rehabilitation. As the vibration propagates through the tailings profile it may amplify (depending on its amplitude and frequency content and natural frequency of the tailings), and hence trigger a tailings liquefaction.
The ground acceleration time histories of multiple commonly used machineries are evaluated in this study. The acceleration propagation profile through tailings is evaluated using one dimensional analysis. The liquefaction potential of the tailings under such acceleration is then studied using a CPT based method. The result indicated the vibrations produced by the proposed construction machineries do not result in the tailings liquefaction for this specific site.
$15.00
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