Strain Rate Effects in Model Pressuremeter Testing

A series of one-eighth-scale strain controlled model pressuremeter tests were performed using an automated flexible wall calibration chamber testing system. Undrained model pressuremeter tests were performed with and without the internal pore-water pressure measuring piezometer needles at radial str...

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Bibliographic Details
Published inJournal of geotechnical and geoenvironmental engineering Vol. 123; no. 11; pp. 1051 - 1059
Main Authors Penumadu, Dayakar, Chameau, Jean-Lou
Format Journal Article
LanguageEnglish
Published New York, NY American Society of Civil Engineers 01.11.1997
Subjects
Applied sciences
Buildings. Public works
Exact sciences and technology
Geotechnics
Soil mechanics. Rocks mechanics
TECHNICAL PAPERS
Clay
Consolidated soil
Cavity
Pore pressure
Undrained soil test
Pressuremeter
Triaxial test
Experimental study
Expansion
Soil mechanics
Strength
Strain rate
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Summary:A series of one-eighth-scale strain controlled model pressuremeter tests were performed using an automated flexible wall calibration chamber testing system. Undrained model pressuremeter tests were performed with and without the internal pore-water pressure measuring piezometer needles at radial strain rates ranging from 1 to 8% min in a controlled laboratory setup in beds of kaolin clay prepared with known stress histories. Reference strength and deformations properties were determined using one-dimensional consolidation, isotropically consolidated undrained compression (CIUC) and Ko consolidated undrained compression (CKoUC) laboratory tests, and comparisons are made with the interpreted values from the pressuremeter test data. Interpretations of the undrained shear strength, initial shear modulus, shear stress-radial strain variation, limit pressure, and horizontal stress for each net pressuremeter curve were evaluated using various interpretation procedures, using the Marquardt-Levenberg algorithm. Based on the laboratory test data and the analytical interpretations, several conclusions were made regarding the effects of the rate of probe expansion on the deduced shear modulus, undrained shear strength, and limit pressure in the pressuremeter testing of clays.
ISSN:1090-0241
1943-5606
DOI:10.1061/(ASCE)1090-0241(1997)123:11(1051)