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 language | English |
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Pages (from-to) | 1539-1549 |
Number of pages | 11 |
Journal | Canadian Geotechnical Journal |
Volume | 52 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Jan 2015 |
Externally published | Yes |
Keywords
- Cut-off wall
- Dewatering
- Excavation
- Leakage
- One-dimensional consolidation
- Settlement
- Three-dimensional groundwater seepage
ASJC Scopus subject areas
- Civil and Structural Engineering