Distinction and interrelation between liquefaction, state of limit equilibrium and failure of soil mass

The distinction and interrelation between the liquefaction, the state of limit equilibrium and the failure of soil masses are studied and discussed. Although there are some linkages between them,however, they belong to three different domains having different definitions with three quite different criteria, which should not be inter-confused and miss-applied. Finally,the author gives his opinion on the principle and methods for preventing the failure of soil masses due to liquefaction.