Dynamic centrifuge modelling of liquefaction response of deep sand layer
Dynamic centrifuge modelling of liquefaction response of deep sand layer
Centrifuge model tests serve as a promising approach to model the prototype response in geotechnical engineering. However, one obstacle to directly modelling the mega prototype arises from the limited centrifuge capacity. To address this problem, one dynamic centrifuge model test has been conducted on a level ground consisting of underlying saturated sand layer and the overlying lead shot layer, to explore the dynamic response of deep sand layer. The sand layer of the model ground has a relative density of 60% and is subjected to the overburden effective pressure of 400 kPa. The pore pressure dissipation time is scaled to the prototype by introducing a transition function layer between the overlying lead shot layer and the underlying liquefiable sand layer, and the proper transfer of dynamic shear stress between the two layers is also considered by sophisticated model preparation technique. The study indicates that the deep sand layer is still prone to liquefaction when it is subjected to shaking strong enough. And the effects of high overburden stress on dynamic response are also discussed. The novel experimental configuration exhibits good performance in modelling soil liquefaction response of deep sand layer.
Xiaotian Yang; Yan-Guo Zhou; Qiang Ma; Yunmin Chen
5th European Conference on Physical Modelling in Geotechnics (ECPMG2024)
New facilities, new equipment, measuring techniques
https://doi.org/10.53243/ECPMG2024-101
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