By Magued Iskander
One of the main problems in predicting the capability of pipe piles in sand has resulted from an absence of knowing of the actual methods 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 establish 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 geared up with miniature pore-pressure transducers to observe the new release of pore water strain in the course of set up and loading. a quick automated laboratory pile hammer able to representing the phenomena that happen in the course of pile riding used to be additionally built and used. eventually, a strain chamber; suggestions keep watch over method; facts acquisition procedure; 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 gear is gifted with enough information to permit readers to replicate or adjust the layout to fit their very own needs.
A variety of load assessments 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 equipment, and supply specific 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
G. Lacy 1981 and Moe et al. 1981). 3 Effects of Pile Setup on Drivability The role of excess pore pressures in reducing the energy required to drive piles in clay is well documented (Reese 1981). When pore pressures are artificially raised, the end bearing and skin friction are reduced (Armishaw and Cox 1979). Buildup of transient excess pore pressure in the sand during driving is therefore likely to reduce the driving resistance. Because sands have a high permeability, buildup of pore pressures is likely to have small, transient effects on skin friction.
114. : Historical Development and Assessment of the Current API Design Methods for Axially Loaded Piles. In: Proc. Offshore Technology Center, Houston, TX, OTC paper 7157, pp. : Pile Foundation Analysis and Design. : Capacities of Piles Driven into Dense Sands. Presentation to the 11th Conf. : Sand Displacement and Compaction Around Model Friction Piles. : Friction Piles in Non-Cohesive Soils. D. : Case Study of Offshore Pile System Reliability. In: Proc. , pp. : Some Effects of Pile Driving on Skin Friction, Behavior of Piles.
57. The ratios of Qc/Qm tend to be normally distributed when log(Qc/Qm) is used. 74), which indicates that the API method tends to under-predict capacities. The large scatter indicates that the method can be unsafe in some cases and uneconomical in others. Use of the API method led to under-prediction of the capacities of short piles and over-prediction of the capacity of long piles (Fig. 2). The over-predictions may be large for piles of lengths often used offshore. 4 Analysis Using the 2000 API RP 2A 15 Measured Capacity, kips 104 103 102 101 101 102 103 104 Calculated Capacity, kips Fig.