Home Documents Design Principles for Soil Friction Pile Derived from Fundamental Theories & Field Data
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Design Principles for Soil Friction Pile Derived from Fundamental Theories & Field Data
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Traditional replacement non-percussion piles (e.g. pre-bored rock-socketted steel H-piles/ mini-piles, or large diameter bored piles) usually derive the resistance from end-bearing on hard stratum only. However, on some sites in Hong Kong (e.g. in Mid-Levels) sound bedrock can only be found at very deep level, and a cost effective solution is to adopt displacement or replacement piles relying on the shaft friction component (“friction piles”). In this paper, the fundamental theories governing the forces acting on the pile/soil system and the actual soil stress-strain relationship are firstly considered. In order to develop from fundamental theories the general principles for friction pile design, Architectural Services Department (“ArchSD”) has been carrying out since the mid 1990s analyzing/loading tests on 12 nos. meticulously instrumented friction piles. With the loading and deformation at various depths measured for each loading stage, the relative shear displacement and axial load profiles can be established for each instrumented pile. These together with the SPT-N value (which is a measure of the shearing resistance that is available in the soil) can then establish at various depths the ratio of shearing strength to SPT-N value thus mobilized and finally a more workable friction pile design equation.
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