A field test for dynamic soil properties
The propogation velocity of waves through ground has been used for many years in the seismic surveys for the detection of underlying strata. From a knowledge of the percussion (P) and shear (S) wave velocities in different materials, together with their bulk densities, it is possible to derive dynamic moduli and properties, such as the shear modulus (G) and poisson’s ratio (n), which are essential in the solution of problems relating to dynamic earth pressure, soil structure interaction and the dynamic analysis of foundation strata relating to earthquake engineering.
The principle involved in finding the wave velocities in ground materials is the same as used in finding velocities in any material. A simple wave form or pulse is generated at one point and the travel time to several other points is detected with suitable signal receivers.
Kobayashi, "Mechanism of Earthquake Damage to Embankments and Slopes" - 4th World Conference on Earthquake Engineering 1969.
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Duke, C. M. "Techniques for Field Measurement of Shear Wave Velocities in Soils" - 4th World Conference on Earthquake Engineering 1969.
Chae, Y. S. "Material Constants of Soils a s determined from Dynamic Testing" - Proc. Int. Symp. Wave Propogation and Dynamic Properties of Earth Materials 1964.
Bullen, K. E. "An Introduction to the Theory of Seismology - p. 105 - Cambridge University Press 3rd ed. 1963.
Copyright (c) 1971 G. L. Evans
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