2011 Volume 67 Issue 4 Pages 422-440
Generally it is thought that occurrence of excess pore water pressure in liquefied ground leads to the loss of shear strength and shear modulus and dissipati on of excess pore water pressure recovers the state of the liquefied ground compared with the ground before liquefaction occurred by earthquake. Therefore, it is rare to report results of investigation to compare the states of the ground before and after liquefaction systematically. In this study, full-scale field experiment by using controlled blast technique was carried out to assess the behavior during and after liquefaction and densification of liquefied ground. This paper describes the distribution of volumetric strain, recovery and increase in N-value and time history of densification and N-value of liquefied layer through the observational results which were obtained by some kinds of sounding tests before and after liquefaction.
