Characteristics of groundwater seepage with cut-off wall in gravel aquifer. II: Numerical analysis

Y.-X. Wu, S.-L. Shen, Zhenyu Yin, Y.-S. Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

81 Citations (Scopus)

Abstract

© 2015, Canadian Science Publishing. All rights reserved.This paper presents a numerical investigation into the leakage behavior of cut-off walls in gravel strata due to dewatering in a deep excavation pit. The calculated values of the groundwater head and surface settlement using a model agree well with the measured values. Values of the hydraulic conductivity (k) and storage coefficient (Ss) of each soil layer are obtained from the test results when the cut-off wall is 43mdeep. The leakage through the cut-off wall in gravel is analyzed by considering a variation in hydraulic conductivity in different sections of the cut-off wall. The simulated results show that a significant leakage occurred in the 54mdeep cut-off wall. Although leakage did occur in the full cut-off wall in the confined aquifer, the full cut-off wall is still more efficient in preventing groundwater seepage than the partial cut-off wall. The relative depths of the cut-off wall and of the wells have a significant effect on ground surface settlement during the withdrawal of groundwater. Therefore, the appropriate selection of relative depth of both cut-off wall and pumping well is an effective way of controlling surface settlement outside the pit.
Original languageEnglish
Pages (from-to)1539-1549
Number of pages11
JournalCanadian Geotechnical Journal
Volume52
Issue number10
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Cut-off wall
  • Dewatering
  • Excavation
  • Leakage
  • One-dimensional consolidation
  • Settlement
  • Three-dimensional groundwater seepage

ASJC Scopus subject areas

  • Civil and Structural Engineering

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