Factors affecting piping erosion resistance: Revisited with a numerical modeling approach

Junliang Tao, Hui Tao

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Piping poses a great threat to dam and levee systems across the globe. Although various straightforward approaches have been used to assess piping resistance, a fundamental understanding of the complex soil-flow interactions in this process is still lacking. Practitioners have traditionally relied on Terzaghi's theory to evaluate piping potential. In this study, the factors affecting piping resistance are revisited using a coupled computational fluid dynamics and discrete element method (CFD-DEM) approach. A series of simulations were conducted to investigate the effects of specific gravity, initial void ratio, particle size distribution, sample aspect ratio, and frictional coefficients. Analyses of simulation results show good agreement with experimental results in the existing literature providing demonstrative explanations for deviations of the experimental results from Terzaghi's theory. A key finding is that for laboratory experiments with soil samples in a container, the wall friction and the aspect ratio significantly affect the critical hydraulic gradients. The effects of the various soil properties are first analyzed on an individual basis; based on the numerical simulation results, a theoretical model for piping is developed that considers the previously mentioned factors.

Original languageEnglish (US)
Article number04017097
JournalInternational Journal of Geomechanics
Volume17
Issue number11
DOIs
StatePublished - Nov 1 2017
Externally publishedYes

Fingerprint

piping
fluid mechanics
erosion
Terzaghi theory
dams (hydrology)
particle size distribution
specific gravity
friction
modeling
containers
soil properties
soil sampling
simulation
discrete element method
levee
void ratio
soil
computational fluid dynamics
soil property
sampling

ASJC Scopus subject areas

  • Soil Science

Cite this

Factors affecting piping erosion resistance : Revisited with a numerical modeling approach. / Tao, Junliang; Tao, Hui.

In: International Journal of Geomechanics, Vol. 17, No. 11, 04017097, 01.11.2017.

Research output: Contribution to journalArticle

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