Single Pile Settlement and Load Transfer Mechanism due to Excavation in Silty Clay

  • M. A. Soomro Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
  • K. F. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
  • M. A. Soomro Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
  • A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
  • M. A. Keerio Civil Engineering Department, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
Keywords: excavation, pile, silty clay, numerical modelling

Abstract

In densely built areas, development of underground transportation system often involves excavations for basement construction and cut-and-cover tunnels which are sometimes inevitable to be constructed adjacent to existing piled foundations. In order to gain new insights into single pile responses (i.e. settlement and load transfer mechanism) to an adjacent excavation in saturated silty clay, a three-dimensional coupled- consolidation numerical analysis is conducted in this study. An advanced hypoplasticity (clay) constitutive model with small-strain stiffness was adopted. A linear increase in pile settlement was observed due to excavation-induced stress release. This is because part of the pile is placed within the boundaries of a major influence zone due to excavation-induced ground movement. Based on a settlement criterion, apparent loss of pile‘s capacity is 14%. A maximum bending moment of about 350 kNm is induced in the pile with the maximum deflection of 28 mm. In addition, mobilisation of shear strength at the pile-soil interface was found to be a key factor governing pile-soil-excavation interaction. During excavation, a downward load-transfer mechanism in the piles can be identified.

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Author Biographies

M. A. Soomro, Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan

Department of Civil Engineering, Quaid-e-Awam University of Engineering, Sciences & Technology, Sakrand Road, Nawabshah, 67450, Pakistan

K. F. Memon, Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan
Civil Engineering Department, Quaid-e-Awam University of Engineering, Science & Technology, Sakrand Road, Nawabshah 67450, Pakistan
M. A. Soomro, Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan

Department of Civil Engineering, Quaid-e-Awam University of Engineering, Sciences & Technology, Sakrand Road, Nawabshah, 67450, Pakistan

A. Memon, Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan

Department of Civil Engineering, Quaid-e-Awam University of Engineering, Sciences & Technology, Sakrand Road, Nawabshah, 67450, Pakistan

M. A. Keerio, Civil Engineering Department, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Pakistan

Civil Engineering Department, Quaid-e-Awam University of Engineering, Sciences & Technology, Sakrand Road, Nawabshah, 67450, Pakistan

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Published
2018-02-20
How to Cite
[1]
M. A. Soomro, K. F. Memon, M. A. Soomro, A. Memon, and M. A. Keerio, “Single Pile Settlement and Load Transfer Mechanism due to Excavation in Silty Clay”, Eng. Technol. Appl. Sci. Res., vol. 8, no. 1, pp. pp. 2485-2492, Feb. 2018.
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