A Numerical Method for Estimating Strut Forces in Multi-Braced Excavation Systems
Corressponding author's email:
tongn@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.75A.2023.1249Keywords:
Plaxis 3D, Etabs, Strut forces, Multi-braced excavation system, Simple techniqueAbstract
The paper discusses the development of a numerical method for a multi-braced excavation to estimate strut forces. Two different software were used in the proposed method. Equivalent strut forces were calculated by plane strain analysis on Plaxis 2D. The number of Etabs models built corresponds to the number of strut levels. Loads acting on waler beams in these structural models were derived from the results of equivalent strut forces on the Plaxis 2D model. The results of the proposed method were compared with those of a full 3D analysis. This method ensures the force equilibrium with an error of less than 5% as compared with the total strut forces in the 3D calculation. Due to the corner effect not take into account, the corner strut internal forces in the proposed method are usually larger than those in the 3D analysis, while the internal forces of the middle struts seem to be the opposite. Although the differences have a wide variation, the average error is 35%. However, the results from the proposed method are conservative. The proposed method is useful for practicing engineers, especially in the primary design stage of multi-braced excavation with a complex-shaped plan.
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References
K. Terzaghi and R. B. Peck, Soil Mechanics in Engineering Practice, 2nd ed. New York, USA: John Wiley Sons Inc, 1967.
W. Zhanga et al., "Estimation of strut forces for braced excavation in granular soils from numerical analysis and case histories," Computers and Geotechnics, vol. 106, pp. 286-295, 2019.
A. T. C. Goh, Z. Fan, L. Hanlong, Z. Wengang, and Z. Dong, "Numerical Analysis on Strut Responses Due to One-Strut Failure for Braced Excavation in Clays," in Proceedings of the 2nd International Symposium on Asia Urban GeoEngineering, 2018, doi: 10.1007/978-981-10-6632-0_43
PLAXIS 3D tutorial Manual CONNECT, V20 ed., Bentley Systems Inc., USA, 2019.
CSI analysis reference manual, Computer and Structures Inc., Berkeley, California, USA, 2020.
S. P. Yap, F. A. Salman, and S. M. Shirazi, "Comparative study of different theories on active earth pressure," Journal of Central South University of Technology, vol. 19, no. 10, pp. 2933-2939, 2012.
W. G. Clough and J. M. Duncan, "Earth pressures," in Foundation Engineering Handbook, HY. Fang, Eds., Boston, MA, USA: Springer, 1991, ch. 6, pp. 223-235.
S. D. Monfared and A. Sadrekarimi, "Numerical Investigation of The Mobilization of Active Earth Pressure on Retaining Walls," in 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, France, 2013, pp. 793-796.
N. Kohsaka and K. Ishikuza, "Stability of bottom during deep excavations - A survey on Japanese codes," in Underground Construction in Soft Ground, Balkema, Rotterdam, 1995, pp. 323-328.
N. M. Tam and T. V. Thai, "Analysis of diaphragm wall's available displacement according to safety factor," Vietnam Journal of Construction - Copyright Vietnam Ministry of Construction, pp. 141-147, 2017.
P. Fok et al., "Limiting values of retaining wall displacements and impact to the adjacent structures," The IES Journal Part A: Civil & Structural Engineering, vol. 5, no. 3, pp. 134-139, 2012.
L. W. Wong, I. T. Pratama and C. R. Chou, "Corner Effects on Wall Deflections in Deep Excavations," in The HKIE Geotechnical Division 40th Annual Seminar 2020, Hongkong, 2020.
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