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Influence of consolidation properties on the cyclic re-liquefaction potential of sands

机译：固结特性对砂土循环再液化潜力的影响

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The relative density can be used as the main indicator to assess the liquefaction resistance of clean sands. As relative density of the sand deposit increases significantly following the initial liquefaction, one should expect that the soil can improve its liquefaction resistance. However, earthquake records indicate that densified sand can be liquefied again (re-liquefied) at smaller cycles by the similar seismic loadings. This work aims to clarify the counterintuitive finding that, after the first liquefaction, the resulting significant increase in relative density (induced by settlements and variation of the water level) do not necessarily imply an increase in the number of loading cycles for re-liquefaction. In this paper, we present a series of experimental results concerning the cyclic liquefaction and the following re-liquefaction of clean sand deposits. The experimental setup is performed by a shaking table, transmitting one-degree of freedom transversal motion to the soil within the 1.5 m high laminar shear box. At four different seismic demands, the input excitation was imposed three times to examine the influence of the initial distributions of the relative density and the consolidation characteristics on the liquefaction potential of the sand. The re-liquefaction cycles of the sand, which previously experienced liquefaction under the same seismic loadings, show that post-liquefaction reconsolidation of the sand deposits affects the re-liquefaction resistance.
机译：相对密度可以用作评估清洁砂的抗液化性的主要指标。随着初始液化后沙沉积物的相对密度显着增加，人们应该期望土壤可以提高其抗液化性。但是，地震记录表明，在相似的地震荷载作用下，致密的沙子可以以较小的周期再次液化（再液化）。这项工作旨在澄清与直觉相反的发现，即在第一次液化之后，相对密度的显着增加（由沉降和水位的变化引起）并不一定意味着增加了重新液化的装载循环次数。在本文中，我们提出了一系列有关清洁液砂沉积物的循环液化和随后再液化的实验结果。实验装置由振动台完成，将一个自由度的横向运动传递到1.5 m高层流剪切箱内的土壤中。在四个不同的地震需求下，施加了三次输入激励，以检查相对密度的初始分布和固结特性对砂土液化势的影响。先前在相同地震载荷下经历了液化的砂土的再液化循环表明，砂土沉积物的液化后再固结会影响耐再液化性。

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