Skip to main content
SpringerLink
Log in

Utilization of micro-piles for improving the sub-grade under the existing strip foundation: experimental and numerical study

  • Short Communication
  • Published:
Innovative Infrastructure Solutions Aims and scope Submit manuscript

Abstract

Micro-piles are one of the effective techniques used to increase the bearing capacity and reduce the settlement, particularly in strengthening existing foundations. In the current study; the behavior of a loaded strip footing strengthened by two rows of micro-piles fixed along each side which was investigated experimentally and numerically. The results indicated that; the ultimate bearing capacity enhanced by 260% and the footing settlement decreased by 45%. The micro-piles modified the bearing capacity failure of the strip footing from the general shear failure to the punching shear failure. The experimental results were verified using numerical analysis that helped in understanding the failure mechanism and the deformation behavior of such technique.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14

References

  1. Abdrabbo FM (1979) Bearing capacity of a single pile embedded in reinforced earth. Alex Eng J 6:165–175

    Google Scholar 

  2. Abdrabbo FM, El-Hansy RM (1993) Strengthening of loaded footing-soil system. Alex Eng J 32(4):193–198

    Google Scholar 

  3. ASTM (2012) D422-63. Standard test method for particle-size analysis of soils. ASTM International, West Conshohocken, PA, USA

  4. Azzam WR, Basha A (2017) Utilization of soil nailing technique to increase shear strength of cohesive soil and reduce settlement. J Rock Mech Geotech Eng. https://doi.org/10.1016/j.jrmge.2017.05.009

    Article  Google Scholar 

  5. Azzam W, ElWakil A (2015) Experimental and numerical studies of circular footing resting on confined granular subgrade adjacent to slope. Int J Geomech ASCE 16(1):1–15

    Google Scholar 

  6. Azzam WR, Nasr AM (2015) Bearing capacity of shell strip footing on reinforced sand. J Adv Res 6(5):727–737

    Article  Google Scholar 

  7. Basset RH, Last NC (1978) Reinforcing element below the footing and embankment. In: Proceedings, symposium on earth reinforcement, ASCE annual convention, Pittsburgh, PA, pp 202–231

  8. Bhattacharjee A, Mittal S, Krishna AM (2011) Bearing capacity improvement of square footing by micro-piles. Int J Geotech Eng 5(1):113

    Article  Google Scholar 

  9. Binquet J, Lee KL (1975) Bearing capacity tests on reinforced slabs. ASCE J Geotech Eng Div 101:1241–1255

    Google Scholar 

  10. FHWA (2005) Micro-pile design and construction. united states department of transportation. No. FHWA NHI-05-039, December, pp 5-1–5-18

  11. GEO-SLOPE International Ltd. (1992) SIGMA/W, for finite element stress deformation analysis user guide. Version 2, Calgary, Alberta, Canada

  12. Giroud JP, Noiray L (1983) Geotextile-reinforced unpaved road design. ASCE J Geotech Eng Div 107:1233–1254

    Google Scholar 

  13. Hwang T-H et al (2017) Effective installation of micropiles to enhance bearing capacity of micropiled raft. Soils Found. https://doi.org/10.1016/j.sandf.2017.01.003

    Article  Google Scholar 

  14. Lee KL (1976) Reinforced earth—an old idea in a new setting. International Symposium on New Horizons in Construction Materials, held at Bethlehem, Pa. Envo Pub. Co., Vol 1. pp. 655–682

  15. Lizzi F (1979) Reticulated root pile structures for in-situ strengthening. In: Proceedings of the international conference on soil reinforcement, vol 2, Paris, pp 317–324

  16. Mahmoud MA (1988) Plate loading tests on reinforced cohesionless soil. J Egypt Soc Soil Mech Found Eng Div 3

  17. Mandal JN, Manjunath VR (1994) Bearing capacity of strip footing resting on reinforcing sand subgrade. Constr Build Mater 9(1):35–38

    Article  Google Scholar 

  18. Saleh NM (2002) Behavior of footings under centric and eccentric loads adjacent to reinforced slopes. Ain Shams Univ Sci Bull 37(4):41–63

    Google Scholar 

  19. Schlosser F, Bastick M (1985) Reinforced earth: new aspects and new applications. In: 3rd international geotechnical seminar on soil improvement methods, Singapore, pp 273–284

  20. Schlosser F, Juran I (1983) Design parameters for artificially improved soil—general report. In: Proceeding, 7th ECSMF, Brighten

  21. Sharma B, Zaheer S, Hussain Z (2014) An Experimental model for studying the performance of vertical and batter micropiles. Geo-Congress 2014 Technical Papers

  22. Verma BP, Char AM (1986) Bearing capacity tests on reinforced sand subgrades. ASCE J Geotech Eng 112:701–706

    Article  Google Scholar 

  23. Verma BP, Jha JV (1992) Three dimensional model footing tests for improving subgrade below existing footings. In: Proceeding of the international symposium on earth reinforcement. Balkema, Rotterdam, pp 677–682

  24. Watn A et al (1997) Geosynthetic reinforced to improve bearing capacity, laboratory testing and numerical study. In: The fourth international conference on soil mechanics and foundation engineering Hamburg Balkema, Rotterdam, vol 3, pp 1789–1796

Download references

Author information

Authors and Affiliations

  1. Faculty of Engineering, Tanta University, Tanta, Egypt

    W. R. Azzam

  2. Faculty of Engineering, Kafrelshiekh University, Kafrelshiekh, Egypt

    A. M. Basha

Authors
  1. W. R. Azzam
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. M. Basha
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to A. M. Basha.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Azzam, W.R., Basha, A.M. Utilization of micro-piles for improving the sub-grade under the existing strip foundation: experimental and numerical study. Innov. Infrastruct. Solut. 3, 44 (2018). https://doi.org/10.1007/s41062-018-0149-0

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s41062-018-0149-0

Keywords

Search

Navigation