Damage mechanism of stabilizing piles suffered from liquefaction based on dynamic numeric analyses

A large deformation from liquefaction in saturated subgrade may lead to the instability of slope and the damage of the reinforcement measures. Firstly, in order to evaluate the damage mechanism of stabilizing piles suffered from the saturated subgrade liquefaction, this paper perform a dynamic centrifuge modelling test using a kind of stabilizing concrete model pile to study the dynamic water pore pressure, landslide of slope and dynamic crack of the stabilizing pile. Secondly, the breaking damage mechanism of the stabilizing pile is discussed under the condition of a large liquefaction deformation by means of the dynamic consolidation finite element method. The study shows that the large deformation of the reinforced slope caused by the liquefaction leads to a decrease in the earth pressure in front of the stabilizing pile and an increase in the earth pressure behind the stabilizing pile. These comprehensive effects result in a significant increase in the dynamic excess bending moment of the stabilizing pile, and eventually, the total static and dynamic bending moment of the stabilizing piles exceeds the ultimate bending moment and leads to the breaking damage of the piles.