Numerical investigation into the static behavior of stepped soil nail walls

Document Type : Article

Authors

1 Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

2 Department of Civil and Environmental Engineering, University of New Hampshire, United States

Abstract

This paper presents a numerical investigation on the static behavior of stepped soil nail walls constructed in dry sandy soils. The finite element method was used to study influence of wall geometry and soil parameters on behavior of the walls. We analyzed walls with heights of 10, 15, and 20 m .This study shows that the wall deformation and the nail tensile forces of the stepped soil nail wall are smaller than those of the typical soil nail wall. If properties of soils such as friction angle, cohesion, and elastic modulus decrease, these will result in more decrease in the wall lateral displacement and nail tensile forces of a stepped soil nail wall. Therefore, stepped soil nail walls are more effective in soft soils than hard soils. When a step is located at the middle of the wall height, the wall lateral displacement and nail tensile forces are minimized; hence, the ratio of the optimal step depth to the wall height is 0.5. As the step width increases, the wall deformation and nail forces decrease. Numerical analysis demonstrates that the minimum step width is approximately 0.1 times of the wall height.

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References

References
1. Abramson, L.W., Lee, T.S., Sharma, S. and Boyce, G.M., Slope Stability and Stabilization Methods, 2nd Edn., pp. 497-507, John Wiley & sons, New York, USA (2002).
2. Lazarte, C.A., Elias, V., Espinoza, D. and Sabatini, P.J. Geotechnical engineering circular No. 7 soil nail walls", Report FHWA0-IF-03-017, Washington D.C.,
Federal Highway Admin (2003).
3. Giri, D. and Sengupta, A. Dynamic behavior of small
scale nailed soil slopes", Geotechnical and Geological
Engineering, 27(6), pp. 687-698 (2009).
4. Wang, S.G., Duan, Q.W. and Li, Q.R. Behavior of
stepped soil-nail wall", Chinese Journal of Geotechnical
Engineering, 33(1), pp. 207-210 (2011).
5. Unterreiner, P., Benhamiday, B. and Schlosser, F.
Finite element modeling of the construction of a fullscale
experimental soil-nailed wall. French National
Research Project CLOUTERRE", Ground Improvement,
1(1), pp. 1-8 (1997).
6. Babu, G. and Pratap Singh, V. Simulation of soil nail
structures using PLAXIS 2D", Plaxis Bulletin Spring
issue, pp. 16-22 (2009).
7. Chu, L.M. and Yin, J.H. Comparison of interface
shear strength of soil nails measured by both direct
shear box tests and pullout tests", Journal of Geotechnical
and Geoenvironmental Engineering, 131(9), pp.
1097-1107 (2005).
8. Wu, J.Y. and Zhang, Z.M. Evaluations of pullout
resistance of grouted soil nails", In Slope Stability,
Retaining Walls, and Foundations: Selected Papers
from the 2009 GeoHunan International Conference,
Changsha, Hunan, China, pp. 108-114 (2009).
9. Milligan, G.W.E. and Tei, K. The pull-out resistance
of model soil nails", Soils and Foundation, 38(2), pp.
179-190 (1998).
10. Wang, Z. and Richwien, W. A study of soilreinforcement
interface friction", Journal of Geotechnical
and Geoenvironmental Engineering, 128(1), pp.
92-94 (2002).
11. Dassault Systemes Simulia Corpration, Abaqus Analysis
User's Manual, Waltham, Massachusetts, United
States (2011).
12. Briaud, J.L. and Lim, Y. Soil-nailed wall under pilled
bridge abutment: simulation and guidelines", Journal
of Geotechnical and Geoenvironmental Engineering,
123(11), pp. 1043-1050 (1997).
13. Plumelle, C., Schlosser, F., Delage, P., and Knochenmus,
G. French national research project on soil
nailing: CLOUTERRE", In Design and Performance
of Earth Retaining Structures, American Society of
Civil Engineers, Geotechnical Special Publication, 25,
pp. 660-675 (1990).
M.M. Ahmadi and A. Borghei/Scientia Iranica, Transactions A: Civil Engineering 25 (2018) 140{151 151
Scientia Iranica
Volume 25, Issue 1
Transactions on Civil Engineering (A)
January and February 2018
Pages 140-151

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History

  • Receive Date: 12 January 2016
  • Revise Date: 23 June 2016
  • Accept Date: 24 April 2017

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