内部侵蚀对地下结构影响的数值分析:在隧道渗漏问题上的应用

Translated title of the contribution: Numerical analysis of the impact of internal erosion on underground structures: application to tunnel leakage

Ying Jing Liu, Jie Yang, Zhen Yu Yin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

When groundwater leaks into the tunnel from damaged joints or cracks of the linings, fine particles could be pulled off by seepage force and transported throughout the soil matrix into the tunnel. Currently, very limited attention has been paid to the effect of the loss of fine particles induced by the water leakage, namely the internal erosion. In this study, the evolution of soil porosity, gradation, seepage flow, the induced ground movement and lining stress change due to tunnel leakage has been numerically investigated using a novel coupled hydro-mechanical approach formulated within the continuous porous medium framework. A critical state based constitutive model considering the influence of the fines content has been implemented for modelling the mechanical consequences of internal erosion. The numerical results show the spatial and temporal evolution of the eroded zone and the hydro-mechanical response of the tunnel and its surroundings. The results indicate that the commonly used pore pressure reduction-based method without considering internal erosion will under-estimate the leakage induced lining stress change and ground movement. Moreover, the influences of three-dimensional condition are highlighted.

Translated title of the contributionNumerical analysis of the impact of internal erosion on underground structures: application to tunnel leakage
Original languageChinese (Simplified)
Pages (from-to)1383-1390 and 1400
JournalYantu Lixue/Rock and Soil Mechanics
Volume43
Issue number5
DOIs
Publication statusPublished - 10 May 2022

Keywords

  • Fine particles
  • Finite element method
  • Internal erosion
  • Seepage
  • Silty sand
  • Tunnel

ASJC Scopus subject areas

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

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