Analysis of Flow and Failure Mechanism of Cushion in Rigid Pile Composite Foundation
A DEM-FDM coupling model was established in this paper to study flow and failure mechanism of cushions with different thickness in rigid pile composite foundation (RPCF). Via analyzing displacement and stress fields in simulation results, the flow of cushion and its mechanical reason was discussed, the results showed that the flow of cushion was mainly caused by the penetration of pile and sand wedge above the pile head; and the shearing of particles along the outlines of pile shaft and the wedge was the main mechanical reason for the flow of cushion. In addition, theoretical discussion of potential failure of cushion in RPCF showed that the bearing capacity of cushion was large enough to keep cushion safe in normal cases.
Y. K. Dong et al., "Analysis of Flow and Failure Mechanism of Cushion in Rigid Pile Composite Foundation", Advanced Materials Research, Vols. 168-170, pp. 1491-1495, 2011