Parametric Study of Pile Response to Side-by-Side Twin Tunneling in Stiff Clay

  • N. Mangi Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • D. K. Bangwar Civil Engineering Department, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
  • H. Karira Department of Civil Engineering, Mehran University of Engineering and Technology, Pakistan
  • S. Kalhoro Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • G. R. Siddiqui Department of Civil Engineering, Mehran University of Engineering and Technology, Pakistan

Abstract

A three dimensional coupled-consolidation numerical parametric study was carried out in order to gain new insight of single pile response to side-by-side twin tunneling in saturated stiff clay. An advanced hypo plasticity (clay) constitutive model with small-strain stiffness was adopted. The effects of relative to the pile tunnel depths were investigated by simulating the twin tunnels near the pile at various depths of tunnels, namely near the pile shaft, adjacent to the pile toe, and below the pile toe. It was found that the second tunneling in each case resulted in a larger settlement than the one due to the first tunneling with a maximum percentage difference of 175% in the case of twin tunneling near the mid-depth of the shaft. This occurred due to the degradation of clay stiffness around the pile during the first tunneling. Conversely, the first tunneling-induced bending moment was reduced substantially during the second tunneling. The most critical location of twin tunnels relative to the pile was found to be below the pile toe.

Keywords: twin tunneling, pile foundation, parameteric study

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References

G. Gudehus, “A comprehensive constitutive equation for granular materials”, Soils and Foundations, Vol. 36, No. 1, pp. 1-12, 1996 DOI: https://doi.org/10.3208/sandf.36.1

K. Ishihara, “Liquefaction and flow failure during earthquakes”, Geotechnique, Vol. 43, No. 3, pp. 351-451, 1993 DOI: https://doi.org/10.1680/geot.1993.43.3.351

C. W. W. Ng, “The state-of-the-art centrifuge modelling of geotechnical problems at HKUST”, Journal of Zhejiang University Science A, Vol. 15, pp. 1-21, 2014 DOI: https://doi.org/10.1631/jzus.A1300217

J. Jaky, “The coefficient of earth pressure at rest”, Journal of the Society of Hungarian Architects and Engineers, pp. 355-358, 1944

K. H. Chiang, C. J. Lee, “Responses of single piles to tunneling-induced soil movements in sandy ground”, Canadian Geotechnical Journal, Vol. 44, No. 10, pp. 1224-1241, 2007 DOI: https://doi.org/10.1139/T07-050

A. Niemunis, I. Herle, “Hypoplasic model for cohesionless soils with elastic strain range”, Mechanics of Cohesive-frictional Materials, Vol. 2, No. 4, pp. 279-299, 1997 DOI: https://doi.org/10.1002/(SICI)1099-1484(199710)2:4<279::AID-CFM29>3.0.CO;2-8

C. W. W. Ng, M. A. Soomro, Y. Hong, “Three-dimensional centrifuge modelling of pile group responses to side-by-side twin tunnelling”, Tunelling and Underground Space Technology, Vol. 43, pp. 350-361, 2014 DOI: https://doi.org/10.1016/j.tust.2014.05.002

C. W. W. Ng, H. Lu, S. Y. Peng, “Three-dimensional centrifuge modelling of the effects of twin tunnelling on an existiong pile”, Tunneling and Underground Space Technology, Vol. 35, pp. 189-199, 2013 DOI: https://doi.org/10.1016/j.tust.2012.07.008

N. Loganathan, H. G. Poulos, D. P. Stewart, “Centrifuge model testing of tunnelling-induced ground and pile deformations”, Geotechnique, Vol. 50, No. 3, pp. 283-294, 2000 DOI: https://doi.org/10.1680/geot.2000.50.3.283

Abaqus user’s manual, version 6.8.2, Dassault Systemes, 2008

D. Masin, “Hypoplastic cam-clay model”, Geotechnique, Vol. 62, No. 6, pp. 549-553, 2012 DOI: https://doi.org/10.1680/geot.11.T.019

A. M. Marshall, R. J. Mair, “Tunneling beneath driven or jacked end-bearing piles in sand”, Canadian Geotechnical Journal, Vol. 48, No. 12, pp. 1757-1771, 2011 DOI: https://doi.org/10.1139/t11-067

S. W. Jacobsz, J. R. Standing, R. J. Mair, T. Hagiwara, T. Sugiyama, “Centrifuge modelling of tunnelling near driven piles”, Soils and Foundations, Vol. 44, No. 1, pp. 49-56, 2004 DOI: https://doi.org/10.3208/sandf.44.49

P. W. Mayne, F. H. Kulhawy, “K0-OCR relationships in soils”, Journal of the Geotechnical Engineering-ASCE, Vol. 108, No. 6, pp. 851-872, 1982

D. A. Mangejo, M. A. Soomro, N. Mangi, I. A. Halepoto, I. A. Dahri, “A parametric study of effect on single pile integrity due to an adjacent excavation induced stress release in soft clay”, Engineering, Technology & Applied Science Research, Vol. 8, No. 4, pp. 3189-3193, 2018 DOI: https://doi.org/10.48084/etasr.2105

M. A. Soomro, A. S. Brohi, D. K. Bangwar, S. A. Bhatti, “3D numerical modelling of pile group responses to excavation-induced stress release in Silty Clay”, Engineering, Technology & Applied Science Research, Vol. 8, No. 1, pp. 2577-2584, 2018 DOI: https://doi.org/10.48084/etasr.1748

D. R. Coutts, J. Wang, “Monitoring of reinforced concrete piles under horizontal and vertical loads due to tunnelling”, International Conference on Tunnels and Underground Structures, Singapore, November 26-29, 2000

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