Computer-Aided Studies of Complex Soil Moduli

by Robert D. Stoll, Columbia Univ, New York, NY, USA,



Document Type: Proceeding Paper

Part of: Measurement and Use of Shear Wave Velocity for Evaluating Dynamic Soil Properties

Abstract:

Low-cost microcomputers and new electronic components make it possible to measure accurately the phase and amplitude of mechanical waves in the frequency domain at a small fraction of the cost that prevailed only a few years ago. Both laboratory and field experiments benefit from this capability and this paper presents examples of both. In a series of new laboratory experiments the authors have measured the phase and amplitude of both the driving torque and the resulting torsional motion of a cylindrical specimen. Motion is sensed with a capacitive, noncontact probe and torque is measured by use of a torque beam instrumented with a silicon strain-gage bridge. The microcomputer and Fourier transform techniques are also used in the interpretation of some of field work involving Rayleigh and Stoneley waves.

Subject Headings: Soil dynamics | Shear waves | Wave measurement | Rayleigh waves | Soil properties | Soil analysis | Soil stress

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