Moso Bamboo Soil-Nailed Wall and Its 3D Nonlinear Numerical Analysis
Publication: International Journal of Geomechanics
Volume 16, Issue 5
Abstract
This paper presents a new earth-retaining structure, the moso bamboo soil-nailed wall. Moso bamboo (including branches) is employed as soil nails and piles, and used to weave bamboo strip grids (replacing rebar grids) for sprayed-concrete surface courses. In this paper, the design and construction methods of this structure are elaborated using laboratory and field tests, and numerical simulations for two completed projects with respect to stability and deformation, respectively. In-situ tests show that the pulling capacity of bamboo nails (with branches) increased by ∼2.5–2.8 times in stiff soil or soft clay, respectively, compared with steel-pipe nails. For one wall in soft clay, numerical analysis was conducted, which verified the stability of the bamboo-reinforced system (compared with the soil-nailed wall constructed with steel-pipe nails, which failed). For another wall, the deformation and internal force of the structure were obtained using three-dimensional (3D) nonlinear numerical software. The prediction agrees well with the measured settlements, and has good accuracy against the measured horizontal displacements. The study indicates that the row of nails the lowest level receives the highest axial force (which requires the longest length). This trend is opposite to that in using conventional soil-nailed walls. The moso bamboo method renders an increase in the depth of sliding and thus the stability of excavation, which failed in the wall constructed with conventional steel-pipe soil nails.
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Acknowledgments
The project was supported by the Department of Construction of Fujian Province and the Natural Science Foundation of Fujian Province. The first author was supported by the Fujian Provincial Government Study Abroad Scholarship. The numerical simulations were conducted in the Super Computing Center at Fuzhou University. These supports are gratefully appreciated.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 5 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 9, 2014
Accepted: Nov 5, 2015
Published online: Feb 3, 2016
Discussion open until: Jul 3, 2016
Published in print: Oct 1, 2016
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