By Magued Iskander
One of the main problems in predicting the capability of pipe piles in sand has resulted from an absence of figuring out 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 strategies. those amenities contain a special instrumented double-walled pipe-pile that's used to delineate the frictional stresses performing opposed to the exterior and inner surfaces of the pile. The pile is equipped with miniature pore-pressure transducers to watch the new release of pore water strain in the course of install and loading. a quick computerized laboratory pile hammer in a position to representing the phenomena that take place in the course of pile riding was once additionally constructed and used. ultimately, a strain chamber; suggestions regulate procedure; information acquisition approach; loading body; sand dealing with, pluviating, saturating, and drying equipment were built-in to permit handy load checking out of piles less than simulated box stipulations. The experimental gear is gifted with enough info to permit readers to copy or regulate the layout to fit their very own needs.
A variety of load checks have been conducted to spot the consequences 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 gear, and supply precise insights into soil-structure interplay in the course of pile riding and next loading. The paintings contributes to a greater knowing of pile behavior.
Read or Download Behavior of Pipe Piles in Sand: Plugging and Pore-Water Pressure Generation During Installation and Loading PDF
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Additional resources for Behavior of Pipe Piles in Sand: Plugging and Pore-Water Pressure Generation During Installation and Loading
Go (1990) suggests that neglecting the load transfer for one diameter at the tip of the pile increases the accuracy of the predicted axial capacity. A different kind of end effect develops when the inside of an open-ended steel pipe pile is drilled out. Two case histories were presented by Olson and Al-Shafei (1988) show that the un-stressing of the pile tip results in the need for considerably larger tip settlements to develop tip capacity. Although residual stresses do not affect the total pile capacity, they may influence the load-transfer mechanism, thereby reducing pile capacity developed at a particular settlement (Darrag 1987).
Thus, many of the important issues cannot be resolved on the basis of the available data alone. Experimental research on the physical processes that control the behavior of piles during installation and loading is required in order to resolve the important uncertainties in axial capacity predictions. Considering the large number of variables involved in axial pile capacity development, as well as the high cost of load tests on full scale instrumented piles, it is unlikely that a sufficient number of full scale load tests can be performed to resolve the problem.
In: Proc. Civil Engineering in The Oceans V, pp. 783–797. : The Ultimate Bearing Capacity of Pipe Piles in Sand. In: Proc. Third Asian Regional Conf. of Soil Mechanics and Foundation Engineering, vol. 1, pp. : Behavior of Sand Plugs in Open Ended Steel Pipe Piles. In: Proc. 9th Int. Conf. on Soil Mechanics and Foundation Engineering, Tokyo, pp. : Behavior of Dry Sands in Steel Pipe Piles. In: Proc. : Computing Axial Pile Capacity in Sands for Offshore Conditions. : Performance of Axially Loaded Pipe Piles in Sand.