A parametric study on side shear resistance on a rock socketed pile

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A parametric study on side shear resistance on a rock socketed pile

 

Author: Chan, Chi-pui
Title: A parametric study on side shear resistance on a rock socketed pile
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Piling (Civil engineering)
Shear (Mechanics)
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: xi, 177 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1641617
URI: http://theses.lib.polyu.edu.hk/handle/200/3842
Abstract: Large diameter bored piles socketed into rock are often used to support tall buildings and heavy civil engineering structures. A rock socketed pile not only furnishes a significant large pile resistance but also controls the pile settlement. The behavior of the socketed pile is controlled by both end bearing and rock side shear resistance. In practice, particularly in Hong Kong, the rock socketed pile is designed for end-bearing resistance only. This approach has often been criticized as a conservative and non-economic design. To design a pile in higher capacity, the designer should take into account of both end bearing and side shear resistances. This thesis presents a parametric study on behavior of a rock socketed pile by the finite difference method. The behavior of the rock socketed pile is substantially dependent on the characteristics of the pile rock interface and rockmass. Influences of various interface and rockmass parameters on the development of side shear stress, slip condition and load distribution of both socketed piles have been investigated. Particular attentions are drawn to the piles with complete contact to the embedded rockmass and a pile with a soft seam beneath the base. The overburden pressure on the rockmass, which has been overlooked in the past, significantly increases the ultimate shear stress. This study indicates that the ultimate shear stress is significantly reduced and the slip of the pile-rock interface occurs in a relative short settlement when a soft seam is beneath the pile base. In addition, the socketed piles drilled in deep bedrock, which experiences higher overburden pressure, will provide a higher ultimate shear stress.

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