Evaluation of liquefaction strength curve using cumulative dissipated energy

The paper proposed a new method to calculate a liquefaction strength curve with a single specimen using the two unique relationships between the normalized cumulative dissipation energy and excess pore pressure ratio, the increment of the normalized dissipation energy and the shear stress ratios defined at each cycle. The method was verified from the liquefaction strength tests using the reconstituted specimens with various relative density made by wet tamping (WT) and air pluviation (AP) method. In the specimens for AP, the liquefaction resistance was increased by small cyclic loads during the undrained cyclic test. The different liquefaction strength curves were obtained depending on the amplitude of cyclic load tests. Applying the small drained cyclic loads to the specimens for AP prior to liquefaction strength tests, the liquefaction strength became higher and the increase of liquefaction resistance during load tests was not observed. As the results, the almost same liquefaction strength curve was obtained from many specimens without depending on the amplitude of cyclic loads.