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Ground response due to diaphragm wall installation in clay: centrifuge model tests

Ground response due to diaphragm wall installation in clay: centrifuge model tests
Ground response due to diaphragm wall installation in clay: centrifuge model tests
A series of centrifuge model tests has been carried out to investigate the ground movements which occur during the installation of diaphragm walls in clay soils. The paper describes the centrifuge modelling technique, with reference to features such as the high initial in situ lateral earth pressures in overconsolidated clay deposits, and the stress and drainage boundary conditions imposed at the interface between the trench and the soil. The changes in pore water pressure and ground movements observed during the simulation of slurry trenching and concreting in a number of centrifuge model tests are described, and the influence of groundwater level and trench geometry is discussed. Ground movements were found to depend on a number of factors, including the initial groundwater level and the geometry (length/depth ratio) of the panel. The initial groundwater level is particularly important: soil surface settlements were reduced by a factor of 10 when a plane strain excavation was carried out with the water-table 10 m below ground level rather than at the soil surface. For a diaphragm wall trench 18·5 m deep and 1 m wide, three-dimensional effects were found to reduce the displacements at the centre-line of a single panel by a factor of 3 (compared with the plane strain case) for a panel 5 m long, but the benefit for a panel 10 m long was much smaller.
diaphragm and in situ walls, trenches, clays, retaining walls, centrifuge modelling, settlement
0016-8505
725-739
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Kantartzi, C.
c4b7d1a3-2496-434f-ad21-73e070b20f07
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Kantartzi, C.
c4b7d1a3-2496-434f-ad21-73e070b20f07

Powrie, W. and Kantartzi, C. (1996) Ground response due to diaphragm wall installation in clay: centrifuge model tests. Géotechnique, 46 (4), 725-739. (doi:10.1680/geot.1996.46.4.725).

Record type: Article

Abstract

A series of centrifuge model tests has been carried out to investigate the ground movements which occur during the installation of diaphragm walls in clay soils. The paper describes the centrifuge modelling technique, with reference to features such as the high initial in situ lateral earth pressures in overconsolidated clay deposits, and the stress and drainage boundary conditions imposed at the interface between the trench and the soil. The changes in pore water pressure and ground movements observed during the simulation of slurry trenching and concreting in a number of centrifuge model tests are described, and the influence of groundwater level and trench geometry is discussed. Ground movements were found to depend on a number of factors, including the initial groundwater level and the geometry (length/depth ratio) of the panel. The initial groundwater level is particularly important: soil surface settlements were reduced by a factor of 10 when a plane strain excavation was carried out with the water-table 10 m below ground level rather than at the soil surface. For a diaphragm wall trench 18·5 m deep and 1 m wide, three-dimensional effects were found to reduce the displacements at the centre-line of a single panel by a factor of 3 (compared with the plane strain case) for a panel 5 m long, but the benefit for a panel 10 m long was much smaller.

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More information

Published date: December 1996
Keywords: diaphragm and in situ walls, trenches, clays, retaining walls, centrifuge modelling, settlement
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 74551
URI: https://eprints.soton.ac.uk/id/eprint/74551
ISSN: 0016-8505
PURE UUID: dd0937de-58bb-4a00-96c0-b874bd640bf8
ORCID for W. Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 12 Nov 2019 02:00

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Contributors

Author: W. Powrie ORCID iD
Author: C. Kantartzi

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