Investigating Particle-Size Effect on Uplift Mechanism of Pipes Buried in Sand Using Distinct Element Method
Uplift of pipeline due to buckling deformation and the resultant soil resistance are key concerns in its design. This paper investigates the particle-size effect on uplift resistance of a pipe buried in sand and the ground deformation mechanism using the distinct element method (DEM). Two granular grounds, one for coarse-sand ground and the other for fine-sand ground, were examined in this simulation. The results show that both cases exhibit similar deformation mechanism of four featured stages: mobilization of peak uplift resistance, infilling of soils beneath pipe, formation of shear bands, and flow of soils around pipe. The uplift resistances in both cases gradually increase to a peak and then drop to a constant value with the upward displacement of the pipe. However, higher peak resistance and shear bands with gentler slope are observed in the coarse case.
Qunjie Xu, Honghua Ge and Junxi Zhang
M. J. Jiang et al., "Investigating Particle-Size Effect on Uplift Mechanism of Pipes Buried in Sand Using Distinct Element Method", Advanced Materials Research, Vols. 361-363, pp. 505-509, 2012