SPH-FEM Coupled Analysis of Box Culvert Safety Considering Large Lateral Soil Deformation
JI Shukai
LI Jialiang
SU Hongliang
CUI Wei
Abstract：During the removal of Larsen steel sheet piles in box culvert cofferdams,soil between the piles may experience sliding and deformation,affecting the stability of nearby structures.Conventional FEM methods often encounter numerical non-convergence when simulating large soil deformations,while SPH methods can model particle collapse during soil instability but suffer from lower computational accuracy when used alone.To address this,a coupled SPH-FEM numerical model was developed,incorporating strength reduction theory,to simulate soil instability and collapse between piles.The model analyzed the displacement,principal stress,and anti-sliding stability of the box culvert under four scenarios:removing steel sheet piles on one side,removing them on both sides,and draining water and dredging sediment from an open channel on one side of the cofferdam.The results showed that the maximum differential settlement of the box culvert was 1.4 cm,with a corresponding maximum tensile stress of approximately 0.85 MPa,meeting the strength standards for reinforced concrete box culverts.Additionally,the sliding safety factors for all scenarios satisfied the requirements,indicating good structural stability.The findings align with engineering realities and provide valuable reference for similar projects.
Keywords：large soil deformationparticle collapseconcrete box culvertSPH-FEM couplingnumerical model
Publication Date：2025-11-20
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：8( 69-76 )