Evaluation of Dilatometer Method to Determine Axial Capacity of Driven Model Pipe Piles in Clay

by Alan J. Lutenegger, Univ of Massachusetts, Amherst, United States,
Gerald A. Miller, Univ of Massachusetts, Amherst, United States,



Document Type: Proceeding Paper

Part of: Design and Performance of Deep Foundations: Piles and Piers in Soil and Soft Rock

Abstract:

The flat Dilatometer (DMT) provides a unique approach to estimate the effective stress axial capacity of driven displacement piles in clay. An investigation using this approach was performed for a series of small diameter pipe piles driven into a lacustrine clay deposit. In order to simulate installation effects and changes in lateral stress from pile driving, the standard DMT procedure must be modified to allow for long term equilibrium lateral stress measurements to be obtained. To accomplish this, the blade is pushed into the ground to a desired test depth and a sequence of A-Readings are taken over time until a constant value is obtained. A measure of the 'local' skin friction for each DMT equilibrium test is obtained directly by measuring the pushing thrust using an electric load cell mounted immediately behind the DMT blade.

Subject Headings: Pipe piles | Lateral stress | Clays | Load tests | Axial loads | Soil stress | Soil dilatancy

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