By Magued Iskander
One of the main problems in predicting the means of pipe piles in sand has resulted from a scarcity of knowing of the actual techniques that keep an eye on the habit of piles in the course of deploy and loading.
This monograph provides a close blue print for constructing experimental amenities essential to determine those strategies. 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 geared up with miniature pore-pressure transducers to watch the iteration of pore water strain in the course of install and loading. a quick computerized laboratory pile hammer able to representing the phenomena that ensue in the course of pile using used to be additionally constructed and used. ultimately, a strain chamber; suggestions keep an eye on procedure; information acquisition method; loading body; sand dealing with, pluviating, saturating, and drying gear were built-in to permit handy load checking out of piles below simulated box stipulations. The experimental equipment is gifted with enough information 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 size 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 offered. the result of the checking out software validates the functionality of the constructed equipment, and supply particular 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
3 Typically, construction documents specify a design depth for piles, which cannot be changed if the pile meets early refusal. The high daily cost of offshore construction, with barge time costing up $500,000/day, typically forces construction personnel into jetting the plug out instead of securing a larger hammer. 2 Plugging of Piles 27 observed final heights of the soil cores is larger than those predicted using the design method (Tsien 1986). Second, the formation of the plug appears to be erratic, and not follow the design model (Paikowsky et al.
Bearing Capacity and Settlement of Shallow Foundations on Sand. In: Proc. , pp. : Axial Capacity of Steel Pipe Piles in Clay. In: Proc. Geotechnical Practice in Offshore Engineering, ASCE, Geotechnical Engr. Div. , University of Texas at Austin, pp. 370–388 (1983a) 22 2. : Axial Capacity of Steel Pipe Piles in Sand. In: Proc. , ASCE Geotechnical Engr. Div. , Univ. of Texas at Austin, pp. D. : International State of The Practice for Design and Installation of Axially Loaded Piles. In: Proc. 11th International Conf.
In rare occasions, such as driving in very dense sands, piles may plug and impede driving. Plugging may result in a situation where the available pile hammer cannot drive the pile to the design depth. The problem is more critical for piles with thickened walls near the mudline (surface), such as the piles used to resist lateral loading (Murff 1990). If the pile plugs and “refuses” prematurely, the required thick section may end up above the mudline. If a plug forms during the installation of an offshore pile, the plug is typically removed by drilling or jetting3.