|Title:||A parametric study on side shear resistance on a rock socketed pile|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Piling (Civil engineering)
Department of Civil and Structural Engineering
|Pages:||xi, 177 leaves : ill. ; 30 cm|
|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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