Vulcan Hammers and the Gates Formula

For many years, Vulcan included Engineering News Formula charts and data in its literature.  Vulcan dropped the EN formula out of its literature in the 1970's, for two reasons: the wave equation was in the ascendancy, and endorsement of the EN formula was an implied endorsement of the "bearing power" of the piles they drove, … Continue reading Vulcan Hammers and the Gates Formula

TAMWAVE: Cavity Expansion Theory and Soil Set-Up

One of the things that was attempted in the TAMWAVE project is the use of cavity expansion theory to estimate soil set-up in cohesive soils. Doing this, however, brought some complications that need some explanation. Cavity expansion theory is basically the study of what happens when one body expands inside of another. When this takes […] … Continue reading TAMWAVE: Cavity Expansion Theory and Soil Set-Up

Relating Hyperbolic and Elasto-Plastic Soil Stress-Strain Models

It is routine in soil mechanics to attempt to use continuum mechanics/theory of elasticity methods to analyse the stresses and strains/deflections in soil. We always do this with the caveat that soils are really not linear in their response to stress, be that stress axial, shear or a combination of the two. In the course […] … Continue reading Relating Hyperbolic and Elasto-Plastic Soil Stress-Strain Models

TAMWAVE: Pile Toe Resistance, and Some More on Pile Shaft Resistance — vulcanhammer.net

With this post we begin to discuss our “other” project: the TAMWAVE project. It’s been around a long time but is now being revised. The concept is to afford students a method of getting acquainted with several aspects of computer-aided driven pile design, including the following: Estimating axial capacity of the pile; Estimating the axial […] … Continue reading TAMWAVE: Pile Toe Resistance, and Some More on Pile Shaft Resistance — vulcanhammer.net

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

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. Analysis of the Pile Load Test … 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