间断级配砂土渗流侵蚀现象的计算流体力学-离散元耦合模拟

Translated title of the contribution: Simulation of seepage erosion in gap graded sand soil using CFD-DEM

Wei Yi Li, Jian Gu Qian, Zhen Yu Yin, Chuang Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Seepage erosion can lead to the loss of particles in the soil with water flow, thereby changing the mechanical and hydraulic properties of the soil, and then causing the deformation and even damage of earth-rock dams in engineering. In this paper, the coupled CFD-DEM method is used to study the seepage erosion characteristics of gap-graded sandy soil, which is widely found in dam foundation, filter-base soil systems in earth-rock dams and gravel packing for sand control in oil and gas production, after reasonable simplification of its gradation. The effects of hydraulic gradient, confining pressure and fines content on seepage erosion in gap-graded sand soils were investigated through 8 groups of upward seepage simulation. Macroscopic phenomena such as the mass of fines loss, fines loss rate, soil surface settlement and microstructural changes were monitored in the tests and verified against previous indoor tests. The results showed that the effect of fines content on the mass of fines loss, peak fines loss rate and soil surface displacement from the numerical simulation was more significant than the effect of the confining pressure and hydraulic gradient in the tests. In addition, the analysis of microstructure demonstrated that the conversion of the soil force chain transfer structure occurred near the threshold of 25% fines content. The triaxial results indicated that the loss of fines also led to a decrease in peak strength and E50 modulu of soil.

Translated title of the contributionSimulation of seepage erosion in gap graded sand soil using CFD-DEM
Original languageChinese (Simplified)
Pages (from-to)3191-3201
Number of pages11
JournalYantu Lixue/Rock and Soil Mechanics
Volume42
Issue number11
DOIs
Publication statusPublished - 10 Nov 2021

Keywords

  • Confining pressure
  • Coupled CFD-DEM
  • Fines content
  • Hydraulic gradient
  • Microstructure
  • Seepage erosion

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

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