Drivability of Vulcan Hammers and Other Pile Driving Equipment

This section of vulcanhammer.info is about the drivability and performance of pile driving equipment in general and Vulcan hammers in particular. It's divided into several sections: Dynamic formulae: the original method of relating hammer performance to pile capacity and resistance Before Wellington and ENR: Early Dynamic Formulae, and Sanders' Formula The Engineering News Formula, and Its Treatment … Continue reading Drivability of Vulcan Hammers and Other Pile Driving Equipment

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Papers and Documents on Pile Driving and Driven Piles

The papers and monographs below are of general interest. We also offer the following topical pages as well: Pile Driving in Practice Pile-Soil Interaction (including static methods of pile capacity analysis) Programs and spreadsheet for pile capacity analysis Detailed information on pile dynamics and the wave equation is here. Allowable Stresses for the Upside-Down Timber … Continue reading Papers and Documents on Pile Driving and Driven Piles

Pile Soil Interaction (including Static Capacity Analysis of Piles, Axial and Lateral)

The Action of Soft Clay Along Friction Piles: Bay Mud Revisited Lymon C. Reese 1983 Research at Berkeley more than three decades ago gave new insight into the behaviour of axially-loaded piles in clay. Numerous experiments and analytical studies performed since, many of which have been supported by the oil industry with respect to offshore … Continue reading Pile Soil Interaction (including Static Capacity Analysis of Piles, Axial and Lateral)

Pile Capacity Programs and Spreadsheet: Axial and Lateral

The ultimate objective of any driven pile is to carry some kind of load. These loads come from a variety of sources, as seen on the right. Once the loads are established, the pile's resistance to the loads must be established. The interaction of piles and the surrounding soils--axial and lateral--is complex. Computer software and … Continue reading Pile Capacity Programs and Spreadsheet: Axial and Lateral

Pile Driving in Practice

This page concentrates on practical pile driving information, primarily for the contractor but also for engineers and owners as well. More detailed information (especially for Vulcan hammer owners) can be found in the Vulcanhammer.info Guide to Pile Driving Equipment. A very complete reference for this kind of information is Pile Driving by Pile Buck. Current … Continue reading Pile Driving in Practice

Pile Dynamics: Field Measurement and Verification of Pile Drivability and Capacity

During the early years of stress-wave theory applied to driven piles, the only way it was done was through the wave equation program. One ran the wave equation, then checked it against field performance. However, a simple blow count check wasn't enough. Were the driving stresses predicted properly? How did the performance of the various … Continue reading Pile Dynamics: Field Measurement and Verification of Pile Drivability and Capacity

Wave Equation Analysis

By the 1920's dynamic formulae were well established in the driven pile industry. Without really consistent methods of static capacity estimation, and given the conservative nature of most foundation design, their weaknesses were not fully appreciated. The event that brought their weakness to the forefront was the development of precast concrete piles. Dynamic formulae assume … Continue reading Wave Equation Analysis

Other Monographs on the Wave Equation

Analytical Interpretation of Pile Installation and Axial Performance Hudson Matlock, Ignatius Lam and Lino Cheang A program of combined experiment and analytical studies is presently underway with the purpose of extending present understanding of the axial behaviour of pile foundations. The analytical developments are designed for back fitting and correlating the experimental results and for … Continue reading Other Monographs on the Wave Equation

Differential Equations and Laplace Transforms in Soil Dynamics

For geotechnical practicioners, the wave equation is a phenomenon which is generally dealt with using a finite element or difference computer program. For mathematicians, it is a second order, hyperbolic partial differential equation. Although the computer programs are certainly a solution to these problems (and in the case of the nonlinear phenomena just about the … Continue reading Differential Equations and Laplace Transforms in Soil Dynamics

ZWAVE

ZWAVE was Vulcan's foray into the wave equation program field. It was an outgrowth of research that dated back to the late 1970's on the magnitude of impact forces of its hammers on pile tops, so as to estimate both the loads on the equipment and the stresses on the piles. The first tangible result … Continue reading ZWAVE