SPH-Based Analysis on the Lateral Response of Pipe Culverts in the Flowing Process of Liquefied Sand

Zhanbin Wang,Yundong Zhou,Yufeng Gao,Fei Zhang,Xin Yu,Weijie Zhang

doi:10.1155/2019/4351501

Abstract

This study proposes a solid-fluid-coupled Smoothed Particle Hydrodynamics model to investigate the behavior of pipe in the liquefied sand after failure. In this model, the liquefied soil is simulated as a Bingham fluid material combined with the equivalent Newtonian viscosity. Then the pipe culvert is treated as an elastic solid material, and the culvert-soil interaction is assumed as the solid-fluid coupling force. Verification has been conducted through a dam-break model to demonstrate the accuracy of simulating the flow behavior of liquefied sand. At the same time, the applicability of the SPH simulation in the two-phase-coupled force has been checked compared with previous researches. After that, parametric studies are performed on the lateral force and movement of pipe culverts in the flowing sand. The derived results demonstrate that the culvert size and buried depth are the significant factors when estimating the maximum lateral force of culvert-soil system, while the slope angle severely affects the run-out distance of culvert and the velocity of flowing sand.

Highlights

IntroductionUnderground pipelines or culverts suffered great destructions when subjected to the lateral deformation of liquefied soil [1,2,3,4]
This study proposes a solid-fluid-coupled Smoothed Particle Hydrodynamics model to investigate the behavior of pipe in the liquefied sand after failure
Underground pipelines or culverts suffered great destructions when subjected to the lateral deformation of liquefied soil [1,2,3,4]

Summary

Introduction

Underground pipelines or culverts suffered great destructions when subjected to the lateral deformation of liquefied soil [1,2,3,4]. The first case was that the concrete pipe culvert with a diameter of 2.44 m was pulled apart at the joints and suffered lateral displacements as great as 1.8 m measured at the face of compacted fill near the conduit outlet. In this part, the culvert was defined as a hollow and segmented tubular structure separated at joints while the surrounding soil was regarded as liquefied soil. The culvert was defined as a hollow and segmented tubular structure separated at joints while the surrounding soil was regarded as liquefied soil This investigation did not consider the part that the force tries to grab and hold the culvert in place.

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Conclusion