A Parametric Study of Effect On Single Pile Integrity Due to An Adjacent Excavation Induced Stress Release in Soft Clay

D. A. Mangnejo, M. A. Soomro, N. Mangi, I. A. Halepoto, I. A. Dahri

Abstract


To gain new insights into single pile responses to adjacent excavations in soft ground, numerical parametric studies are carried out. An advanced hypoplastic (clay) constitutive model which takes account of small-strain stiffness is adopted. The effects of excavation depths (i.e. formation level) relative to pile were investigated by simulating the excavation near the pile shaft (i.e., He/Lp=0.67), next to (He/Lp=1.00) and below the pile toe (He/Lp=1.33). Among the three cases, the excavation in case of He/Lp=1.33 resulted in the largest pile settlement (i.e. 7.6%dp). On the other hand, the largest pile bending moment was induced in case of He/Lp=0.67.


Keywords


parametric study; different excavation depths; soft clay; single pile

Full Text:

PDF

References


C. W. W. Ng, J. Wei, H. G. Poulos, H. Liu, “Effects of Multipropped Excavation on an Adjacent Floating Pile”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 143, No. 7, pp. 04017021-1 - 04017021-14, 2017

M. Korff, R. J. Mair, F. A. F. Van Tol, “Pile-Soil Interaction and Settlement Effects Induced by Deep Excavations”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 142, No. 8, pp. 04016034-1 - 04016034-14, 2016

R. J. Finno, S. A. Lawrence, N. F. Allawh, I. S. Harahap, “Analysis of performance of pile groups adjacent to deep excavation”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 117, No. 6, pp. 934-955, 1991

A. Goh, K. Wong, C. Teh, D. Wen, “Pile response adjacent to braced excavation”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 129, No. 4, pp. 383–386, 2003

D. Ong, C. F. Leung, Y. Chow, “Pile behavior due to excavation-induced soil movement in clay. I: Stable wall”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 132, No. 1, pp. 36-44, 2006

D. Ong, C. F. Leung, Y. Chow, “Behavior of pile groups subject to excavation-induced soil movement in very soft clay”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 135, No. 10, pp. 1462-1474, 2009

C. F. Leung, Y. Chow, R. F. Shen, “Behavior of pile subject to excavation-induced soil movement”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 126, No. 11, pp. 947-954, 2000

C. F. Leung, J. K. Lim, R. F. Shen, Y. K. Chow, “Behavior of pile groups subject to excavation-induced soil movement”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 129, No. 1, pp. 58-65, 2003

H. G. Poulos, L. Chen, “Pile response due to excavation induced lateral soil movement”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 123, No. 2, pp. 94-99, 1997

R. Butterfield, “A natural compression law for soils”, Geotechnique, Vol. 29, No. 4, pp. 469-480, 1979

B. C. B. Hsiung, “A case study on the behaviour of a deep excavation in sand”, Computer and Geotechnics, Vol. 36, No. 4, pp. 665–675, 2009

D. Liyanapathirana, R. Nishanthan, “Influence of deep excavation induced ground movements on adjacent piles”, Tunnelling and Underground Space Technology, Vol. 52, pp. 168-181, 2016

A. Niemunis, I. Herle, “Hypoplastic model for cohesionless soils with elastic strain range”, Mechanics of Cohesive-Frictional Materials, Vol. 2, No. 4, pp. 279-299, 1997

D. Masin, J. Bohac, P. Tuma, “Modelling of a deep excavation in a silty clay”, in: Proceedings of the 15th European Conference on Soil Mechanics and Geotechnical Engineering, Athens, Greece, Vol. 3, pp. 1509-1514, 2011

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

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

C. W. W. Ng, T. L. Y. Yau, J. H. M. Li, W. H. Tang, “New failure load criterion for large diameter bored piles in weathered geomaterials”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 127, No. 6, pp. 488-498, 2001




eISSN: 1792-8036     pISSN: 2241-4487