A dilatancy constitutive model of saturated sands based on state parameter

In this paper, an existing bounding-surface is modified and a state parameter based on phase transformation state is introduced. The deformation tendency of a sand at any time or any conditions can be judged correctly by state parameter. As a result, the dilatancy depends on the state in a way that yields a zero value at phase transformation state. This dependence allows a realistic modelling of the response of a sand in either loose or dense state,orin the transition from one state to another state. A comparison between model simulations and a sequence of experimental results for drained,monotonic loading conditions shows that the simulation results are consistent with the test results,which can better reflect the mechanics characteristics of sandy soil.