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Advances in Deeep Foundation

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The emerging design methodology Reliability-Based Design has become today’s norm in Japanese structural design codes and will soon be included in the international standard codes. To meet this trend, methods for the design and construction of deep foundations have made large advances.

 As deep foundation construction is one of the most important and applied executions in geotechnical engineering worldwide, both research work by academics and the experience and ideas of practitioners are required to develop this field and meet future standards.

 The International Workshop on Recent Advances in Deep Foundations (IWDPF07, Yokosuka, Japan, 1–2 February 2007) was held to transmit the information on recent advances in deep foundations to an international audience and to provide academics and practitioners the opportunity to discuss the latest developments.

 Every year more than thousand technical papers are presented at the Japanese National Conference on Geotechnical Engineering, but most of these articles are unfortunately not transmitted to other countries. As structural design codes are nowadays written with international standards, a significant amount of useful information would get lost if this information would not be published in a medium that is accessible to an international audience. For this reason, the IWDPF07 workshop has been focused on collecting the contributions that present Japanese technologies and experiences which are of interest to a broad, international audience.

 The result of this effort, this proceedings volume, comprises nine keynote lectures, prepared by outstanding international experts and 34 technical papers. In addition to papers on recent research achievements and on case histories, a significant number of the technical papers is dealing with the practical development of deep foundations, seismic design methods, liquefaction problems, and ground improvements. 

This workshop was held with the support of the Port and Airport Research Institute (PARI) and the Japanese Geotechnical Society (JGS). The research committee of JGS – “On the concept for evaluation of new technology on foundation structure design” – is the mother body of this workshop.

 We would like to express sincere gratitude to both organizations and the committee for their strong support of this workshop. The editors hope that these proceedings will be interesting and fruitful to researchers and practitioners who are active in the development of deep foundation design methods and construction methods.

Pile jacking technology uses static jacking force to install large pre-formed displacement piles without the noise and vibration associated with dynamic piling methods. Recent research into the mechanisms governing the shaft and base resistance of displacement piles is reviewed, and the differences between jacked and driven piles are highlighted. Methods for predicting the resulting pile stiffness and capacity are described, within the framework of recently-developed CPT-based prediction methods. 

Compared to driven piles, jacked installation leads to enhanced plugging and residual base load, and reduced friction fatigue. The resulting axial response is stiffer and can be stronger than an equivalent driven or bored pile. Recent applications of jacked H-piles to support axial load are reported, and a novel technique for optimising the ratio of axial capacity to installation force via plugging is described.