TY - JOUR
T1 - Three-dimensional response of the supported-deep excavation system
T2 - Case study of a large scale underground metro station
AU - Hefny, Ashraf
AU - Al-Atroush, Mohamed Ezzat
AU - Abualkhair, Mai
AU - Alnuaimi, Mariam Juma
N1 - Funding Information:
Funding: This study is substantially supported by the United Arab Emirates University (UAEU) Grant No. G00002855.
Funding Information:
This study is substantially supported by the United Arab Emirates University (UAEU) Grant No. G00002855.
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020/2
Y1 - 2020/2
N2 - The complexities and the economic computational infeasibility associated in some cases, with three-dimensional finite element models, has imposed a motive for many investigators to accept numerical modeling simplification solutions such as assuming two-dimensional (2D) plane strain conditions in simulation of several supported-deep excavation problems, especially for cases with a relatively high aspect ratio in plan dimensions. In this research, a two-dimensional finite element model was established to simulate the behavior of the supporting system of a large-scale deep excavation utilized in the construction of an underground metro station Rod El Farrag project (Egypt). The essential geotechnical engineering properties of soil layers were calculated using results of in-situ and laboratory tests and empirical correlations with SPT-N values. On the other hand, a three-dimensional finite element model was established with the same parameters adopted in the two-dimensional model. Sufficient sensitivity numerical analyses were performed to make the three-dimensional finite element model economically feasible. Results of the two-dimensional model were compared with those obtained from the field measurements and the three-dimensional numerical model. The comparison results showed that 3D high stiffening at the primary walls’ corners and also at the locations of cross walls has a significant effect on both the lateral wall deformations and the neighboring soil vertical settlement.
AB - The complexities and the economic computational infeasibility associated in some cases, with three-dimensional finite element models, has imposed a motive for many investigators to accept numerical modeling simplification solutions such as assuming two-dimensional (2D) plane strain conditions in simulation of several supported-deep excavation problems, especially for cases with a relatively high aspect ratio in plan dimensions. In this research, a two-dimensional finite element model was established to simulate the behavior of the supporting system of a large-scale deep excavation utilized in the construction of an underground metro station Rod El Farrag project (Egypt). The essential geotechnical engineering properties of soil layers were calculated using results of in-situ and laboratory tests and empirical correlations with SPT-N values. On the other hand, a three-dimensional finite element model was established with the same parameters adopted in the two-dimensional model. Sufficient sensitivity numerical analyses were performed to make the three-dimensional finite element model economically feasible. Results of the two-dimensional model were compared with those obtained from the field measurements and the three-dimensional numerical model. The comparison results showed that 3D high stiffening at the primary walls’ corners and also at the locations of cross walls has a significant effect on both the lateral wall deformations and the neighboring soil vertical settlement.
KW - Cross walls
KW - Diaphragm wall
KW - Ground settlement
KW - Lateral deformation
KW - Supported deep excavation system
KW - Three-dimensional finite element model
KW - Wall corners
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U2 - 10.3390/geosciences10020076
DO - 10.3390/geosciences10020076
M3 - Article
AN - SCOPUS:85079699632
SN - 2076-3263
VL - 10
JO - Geosciences (Switzerland)
JF - Geosciences (Switzerland)
IS - 2
M1 - 76
ER -