Numerical Modeling of Pipe-Soil Interaction Under Transverse Direction

Abstract

Based on the Winkler method, a pipe can be treated as a beam, and pipe-soil interactions can be represented by soil springs in the axial, horizontal and vertical directions. Pipe deflection and resultant forces are correlated by coefficient K in the equation F=Kδ, where F is the resultant force and δ is the pipe displacement. This paper studies pipe-soil interaction for pipelines buried in clay and sand subjected to displacements in oblique directions. The objective is to measure the effect of soil parameters on coefficient K as well as the maximum soil resistance. Pipe-soil behavior has been studied using the finite element software ABAQUS/CAE. There are 48 models in total with varying soil parameters, pipe burial depth and pipe-soil interaction friction for the investigation of the effect of each variable on pipe-soil behavior. In addition, the finite element results have been compared to the analytical results from American Lifelines Alliance guideline (ALA, 2001) and proposed failure envelopes in previous studies.

Numerical Analysis of Pipeline Uplift Resistance in Frozen Clay Soil Considering Hybrid Tensile-Shear Yield Behaviors

“…Currently, there are no experimental data on the frozen soil-pipe interface fracture behavior. The parameters for soil-structure interaction are according to Farhadi and Wong [37] and Pike and Kenny [38], which include the interaction between the unfrozen soil and pipe. Such simulation is only valid for buried oil pipes that do not have direct contact with frozen soils due to the applied insulation layer [39].…”

Upward Pipe–Soil Interaction for Shallowly Buried Pipelines in Dense Sand

“…All of these features of the stress-strain behaviour of dense sand have not been considered in the available guidelines or FE analyses. A large number of FE analyses has been conducted using the Mohr-Coulomb (MC) model with constant  and  and therefore cannot model post-peak reduction of Nv, except for the reduction due to change in cover depth (Yimsiri et al 2004;Farhadi and Wong 2014). Yimsiri et al (2004) also used an advanced soil model (Nor-Sand); however, they could not simulate the significant reduction of Nv, as observed in model tests.…”