Research Article
Nov 1982
In Situ Stress Determination by Iowa Stepped Blade
Authors: Richard L. Handy, M.ASCE, Bernard Remmes, AM.ASCE, Steven Moldt, AM.ASCE, Alan J. Lutenegger, AM.ASCE, and Gary Trott, AM.ASCEAuthor Affiliations
Publication: Journal of the Geotechnical Engineering Division
Volume 108, Issue 11
Abstract
Lateral soil pressure is a vital element in soil mechanics theory and practice, but is very sensitive to disturbance and, therefore, difficult to measure. A step-tapered blade was developed to compensate for disturbance by measuring soil pressures on three thicknesses of blades, and extrapolating for the hypothetical pressure at zero blade thickness. The nature of the extrapolation was found to be exponential, with the slope theoretically inverse to the soil compression index Cc. In situ soil stresses measured in fine-grained soils generally agree with stresses from overburden pressures, elastic theory, and pressuremeters. Measured Ko's in natural soil deposits are generally within acceptable ranges, 0.5-1.5 depending on the consolidation state of the soil, and up to 4.2 in expansive clay. About 8-10 tests may be performed per hour; the test may not be reliable in dense sands. Directional horizontal stresses may be obtained with a three-bladed stepped vane.
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Published In
Journal of the Geotechnical Engineering Division
Volume 108 • Issue 11 • November 1982
Pages: 1405 - 1422
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Nov 1982
Published online: Feb 11, 2021
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Authors
Affiliations
Richard L. Handy, M.ASCE
Prof. of Civ. Engrg., Iowa State Univ., Ames, Iowa 50011
Bernard Remmes, AM.ASCE
Geotechnical Engr., McClelland Engrg., Houston, Tex
Steven Moldt, AM.ASCE
Geotechnical Engr., Warzyn Engrg., Inc., Madison, Wisc
Alan J. Lutenegger, AM.ASCE
Pres., Geotechnical Test Systems, Inc., Ames, Iowa 50010
Gary Trott, AM.ASCE
Geotechnical Engr., Weideman and Singleton, Atlanta Ga
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