Characteristics of Liquefaction Strength of Sand under Overconsolidation and Long-Term Consolidation Conditions

Abstract eng:
If sandy soil deposits are subjected to overconsolidation or long-term consolidation, their liquefaction strength increases. However, only a few studies have investigated the effects of overconsolidation or long-term consolidation by means of laboratory element tests in order to simulate the in-situ ground condition more closely. In the present study, the liquefaction strength characteristics of overconsolidated sand samples were investigated under a K0-stress condition by using a hollow cylindrical torsional shear apparatus based on the of the supposition that earthquake excitations affect the ground horizontally. Further, a surcharge method was used to simulate the stress histories of overconsolidation. The effect of overconsolidation on the liquefaction strength was studied on sand samples that were consolidated for a considerable period of time. Clean Toyoura sand and sandy soil collected from the sea bed containing fines were used as samples. The following behaviors were observed in the tests: 1) The liquefaction strength of both types of sand increased due to overconsolidation when the samples were subjected to long-term consolidation before the stress history of overconsolidation was applied to them. 2) The increase in the liquefaction strength of the two types of sand subjected to overconsolidation and long-term consolidation could be formularized by the overconsolidation ratio and the time taken for long-term consolidation.

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