Measurement of base and subgrade layer stiffness using...

Details Measurement of base and subgrade layer stiffness using... Measurement of base and subgrade layer stiffness using...

2006-08-01

2006-08-01

Chapman, John E. (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

Reexamination Certificate

active

07082831

ABSTRACT:
The present invention relates to a device and method for measuring the stiffness of base and subgrade layers of soil. The device is a penetrometer comprising first and second spaced apart cone penetrometer shafts. A first of the cone penetrometer shafts is fitted with a set of at least two vertically spaced apart piezoelectric transmitters for wave transmission. The second cone penetrometer shaft is fitted with a set of at least two vertically spaced apart piezoelectric receivers for wave receiving. A trigger device is provided for triggering shear and primary waves from each piezoelectric transmitter to propagate through the soil. A capture device is provided for capturing the shear and primary waves from each of the piezoelectric receivers. A calculating device is provided for calculating soil stiffness from the measured shear and primary wave velocities.

REFERENCES:
patent: 5177709 (1993-01-01), Baziw
patent: 5432305 (1995-07-01), Nelson
patent: 6386044 (2002-05-01), Weinmann
patent: 6488117 (2002-12-01), Owen

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