Rapid Load Testing on Piles: Interpretation Guidelines

Paul Holscher, Henk Brassinga, Michael Brown, Peter Middendorp, Maarten Profittlich, Frits A. van Tol

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October 14, 2011 by CRC Press
Professional - 108 Pages
ISBN 9780415695206 - CAT# K14100

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Features

  • Provides step-by-step procedures, no personal interpretation of engineers necessary
  • Offers a basic understanding to recognize basic problems and a more advanced discussion for researchers
  • Includes 20 tables with geotechnical reference data, allowing easy access to empirical data
  • Relates to Eurocodes and Standard

Summary

A Rapid Load Test (RLT), developed to determine the initial stiffness and bearing capacity, is an economical and practical alternative to a Static Load Test (SLT). The broad application of RLT, however, was hampered by uncertainty about the interpretation of the test results. This book offers clear guidance on the available analysis techniques and their reliability.

The guidelines were related to an international standard that is drawn up by CEN and can be used in two ways:

  • Straightforward interpretation of test results, chapters 1-3
  • Interpretation with additional background information about the possibilities and limitations, chapters 4-8

The guidelines were drawn up by the Dutch CUR-committee on rapid load testing on piles.

Chapters 1 and 2 deal with the practical execution of the test and the presentation of the results. Chapter 3 gives a general overview of existing interpretation methods and refers to step-by-step descriptions of the two advised interpretation methods.

The aspects that are important for the interpretation are discussed in chapter 4, also showing that the inertia of the pile should be taken into account. In clay soil the rate effect (the dependency of strength and stiffness on loading rate) is also of importance, whereas in sand and silt the generation of pore water pressures during an RLT plays a role. The velocity of the RLT is such that the reaction of sand and silt might be considered as partially drained. These guidelines indicate how these effects can be compensated to obtain the static resistance in the final results.

Chapter 5 presents two interpretation methods (a method for piles in sand, gravel, silt and piles on rock and a method for piles in clay). For practical use, the methods are described in a step-by-step scheme in an appendix.