Civil Engineering and Architecture Vol. 11(3), pp. 1415 - 1423
DOI: 10.13189/cea.2023.110324
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Evaluation of a Braced Excavation by Numerical Method: A Case Study

Vahid Rostami ^1,*, Zainuddin Md Yusoff ¹, Zahraalsadat Eliaslankaran ¹, Haslinda Nahazanan ¹, Ehsan Mousavi ^2
1 Department of Civil Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
² Faculty of Engineering, Kashan University, Iran

ABSTRACT

Approximately 18 by 22 by 100 meters in size, a braced excavation operation at the Mahallati station on Tehran's Metro Line 7 took over eleven consecutive phases. Due to the significant depth-to-width ratio, a PLAXIS plane-strain finite element analysis was carried out. The lateral wall of the braced cut excavation was supported with three types of struts in four different rows. Due to the excavation of the soil, the tension condition was changed and caused some displacements and instabilities; therefore, the horizontal and vertical displacement of the excavation was studied. The maximum horizontal displacements of 35.32 mm occurred in the lateral wall at the excavation surface, whereas the maximum vertical displacements of 35.00 mm occurred at the excavation's base. In all stages, the highest lateral wall deflection values were between 0.00018 and 0.0016 of the depth. The maximum ground surface settlement near the excavation was 22.41mm, approximately 0.67 times the maximum subsequent wall deflection. In each phase, the maximum ground surface settlement distance from the wall was almost equivalent to 0.4 times the excavation depth. The numerical modeling shows that Plaxis2D is an effective software for analyzing the excavation of a braced cut.

KEYWORDS
Braced Excavation, Finite Element, Ground Surface Settlement, PLAXIS, Wall Deflection

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Vahid Rostami , Zainuddin Md Yusoff , Zahraalsadat Eliaslankaran , Haslinda Nahazanan , Ehsan Mousavi , "Evaluation of a Braced Excavation by Numerical Method: A Case Study," Civil Engineering and Architecture, Vol. 11, No. 3, pp. 1415 - 1423, 2023. DOI: 10.13189/cea.2023.110324.

(b). APA Format:
Vahid Rostami , Zainuddin Md Yusoff , Zahraalsadat Eliaslankaran , Haslinda Nahazanan , Ehsan Mousavi (2023). Evaluation of a Braced Excavation by Numerical Method: A Case Study. Civil Engineering and Architecture, 11(3), 1415 - 1423. DOI: 10.13189/cea.2023.110324.