By Magued Iskander
One of the key problems in predicting the potential of pipe piles in sand has resulted from an absence of figuring out of the actual approaches that regulate the habit of piles in the course of deploy and loading.
This monograph offers a close blue print for constructing experimental amenities essential to establish those approaches. those amenities contain a different 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 outfitted with miniature pore-pressure transducers to watch 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 ensue in the course of pile using used to be additionally built and used. eventually, a strain chamber; suggestions keep watch over procedure; facts acquisition procedure; 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 adequate info to permit readers to replicate or alter the layout to fit their very own needs.
A variety of load checks have been performed 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 set up and loading are provided. the result of the checking out software validates the functionality of the built gear, and supply specified insights into soil-structure interplay in the course of pile riding and next loading. The paintings contributes to a greater figuring out of pile behavior.
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Additional info for Behavior of Pipe Piles in Sand: Plugging and Pore-Water Pressure Generation During Installation and Loading
An open-ended pipe pile is said to be plugged when the soil inside the pile moves down with the pile, resulting in the pile becoming effectively closed-ended. Plugging is believed to result in an increase in horizontal stresses between the pile and the surrounding soil, which results in an increase in skin friction. Under static conditions, both theoretical analyses and experiments have shown that plugging occurs with only a small pile penetration (Murff et al. 1990). However, measured heights of plugs in the field are far in excess of what would be predicted from static considerations (Tsien 1986).
Arching of soils inside the pile depends on the ability of the soil to drain pore pressures and develop high frictional stresses along the soil/pile interface. Under cyclic loading, the soil core may become partially drained, which may prevent pile plugging (Randolph et al. 1991). 28 3. 1 Excess Pore Pressures in Clays For piles driven in clay, it is generally accepted that driving results in an increase in both the total stress and pore water pressure over their static values. g. Reese and Seed 1955, Lo and Stermac 1965, D’Appolonia and Lambe 1971, Robertson et al.
The steel and sheet metal plates form a shutter which can be closed to prevent sand flow, or opened to pluviate the sand into the pressure chamber. The sand is rained through two diffusers which hang 10 and 17 in. below the shutter. These diffusers ensure that the sand is evenly distributed within the pressure chamber (Fig. 9). To facilitate sand placement, the pluviator is connected to a circular hinge which encircles one of the load frame’s circular columns (Fig. 8). Using the hinge, the pluviator can swing, on two ball bearings, around the load frame 3 Very fine, uniformly graded Oklahoma sand (Simpson Formation) was used.