By Magued Iskander
One of the key problems in predicting the ability of pipe piles in sand has resulted from a scarcity of knowing of the actual tactics that keep an eye on the habit of piles in the course of deploy and loading.
This monograph provides an in depth blue print for constructing experimental amenities essential to determine those tactics. those amenities comprise a distinct instrumented double-walled pipe-pile that's used to delineate the frictional stresses appearing opposed to the exterior and inner surfaces of the pile. The pile is outfitted with miniature pore-pressure transducers to observe the new release of pore water strain in the course of set up and loading. a quick computerized laboratory pile hammer in a position to representing the phenomena that take place in the course of pile using used to be additionally built and used. eventually, a strain chamber; suggestions regulate process; facts acquisition approach; loading body; sand dealing with, pluviating, saturating, and drying gear were built-in to permit handy load checking out of piles lower than simulated box stipulations. The experimental gear is gifted with enough information to permit readers to copy or alter the layout to fit their very own needs.
A variety of load exams have been performed to spot the results of inertia and build-up of pore water strain on pile plugging. non-stop dimension of dynamic and static extra pore pressures, frictional and finish bearing stresses, and the elevation of the soil contained in the pile in the course of deploy and loading are awarded. the result of the checking out application validates the functionality of the built equipment, and supply specified insights into soil-structure interplay in the course of pile using and next loading. The paintings contributes to a greater realizing of pile behavior.
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Extra resources for Behavior of Pipe Piles in Sand: Plugging and Pore-Water Pressure Generation During Installation and Loading
1) indicates that there are a number of case histories in which the axial pile capacity was over predicted or under predicted by values in excess of 40%. g. Lings 1985, Briaud and Anderson 1987, Toolan et al. 1990, and Olson 1990). Pelletier et al. (1993) argued that the apparent length effect is due to variations in the installation methods, loading history, soil density, or removal of soil plugs. The number of observations for long piles is small and the quality of the data is generally suspect, but the consistency of the length effect in the available data is a cause for concern.
One of the objectives of this monograph is to provide a blueprint for developing the necessary facilities required to perform such research. References American Petroleum Institute (API): API Recommended Practice for Planning, Designing, and Constructing Fixed Offshore Platforms, Working Stress Design, 21st edn. : Prediction of Settlement of Single Piles in Clay. In: Analysis and Design of Pile Foundations, pp. 41–58. : Evaluation of API Method Using 98 vertical pile load tests. In: Proc. 19th Offshore Technology Conf.
Piles are typically driven to firm material and thus logically tend to derive most of their side shear and tip capacities from deeper, thus coarser, soils. Significant vertical and lateral variations in the properties of cohesionless soils may also result in soil borings that do not accurately reflect the soil properties at the location of the load test. When blow counts are used for soil classification, variations in the efficiency of the hammers could also lead to scatter, especially when testing methods differ with respect to time or regionally.