Finite element analysis of mixed-in-place (MIP) columns supporting excavations in slopes considering tension-softening

The use of mixed-in-place (MIP) columns can be considered as an attractive alternative to sheet pile, diaphragm or bored pile walls for supporting deep excavations, even in difficult ground conditions. In this paper, results from a numerical study based on a case history are presented, where MIP col...

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Bibliographic Details
Published in:Canadian geotechnical journal 2020-06, Vol.57 (6), p.785-800
Main Authors: Choosrithong, Kamchai, Schweiger, Helmut F, Marte, Roman
Format: Article
Language:English
Subjects:
adoucissement de la tension
Bored piles
brittle failure
Building codes
Buttresses
Columns (structural)
Constitutive models
cracks
Diaphragm wall
Dredging
Eurocode 7
Excavation
excavations in slopes
Finite element method
fissures
fouilles dans les pentes
Geotechnical engineering
Mathematical analysis
méthode des éléments finis
Optimization
Piles
Sheet piles
Slopes
Structural members
tension-softening
échec fragile
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Summary:The use of mixed-in-place (MIP) columns can be considered as an attractive alternative to sheet pile, diaphragm or bored pile walls for supporting deep excavations, even in difficult ground conditions. In this paper, results from a numerical study based on a case history are presented, where MIP columns are used to support an excavation in a slope. The special feature of this project is that tied-back anchors were not feasible as an additional support measure because structural elements were not allowed to be installed within the neighbouring ground. Thus, the MIP columns were placed in such a way that they formed an arch, including buttresses capable of transferring the load acting on the backside of the wall into the ground. In this study, an advanced constitutive model for the MIP columns is applied to capture the development of possible cracking. Variations in geometry have been performed to investigate the potential for optimization. Finally, some analyses have been conducted to show that a design of such structures compatible with Eurocode 7 requirements is perfectly feasible by means of the finite element method.
ISSN:0008-3674
1208-6010
DOI:10.1139/cgj-2019-0093