The debris flow is a worldwide geological disaster

and has been widely and deeply investigated over the years. Most studies of the geomaterial are focused on the instability mechanisms before the failure and the fast propagation after the failure

separately. This paper attempts to simulate the consistent process of a debris

using a continuous approach. The initiation

propagation and deposit stages of the debris flow are modeled using a constitutive model. The visco-elastoplastic constitutive model with solid-fluid transition is briefly presented and used in the study; and the corresponding physical parameters are carefully calibrated. Two failure mechanisms induced by increasing gravity and decreasing suction are discussed; and the definition for the interface between viscous and elastoplastic layers is explained. Finally

the consistent simulation of the debris flow is performed; and the impact effect against a retaining wall is heuristically studied.