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Two new gages, a free-field gage and a soil-structure gage, have been developed. The spherical free-field gage employs a piezoelectric accelerometer to measure actual ground motion with parameters of relative soil density and and diameter-to-wavelength ratio. The soil-structure gage measures accelerations of the buried structure and uses a piston acting on a helical spring. A comparison of the outputs of of the two gages permits evaluation of the accelerations of both soil and structure as a function of mean density and stiffness of the interface. Tests were performed in the laboratory by having falling weights impact a sand bin and in the field in clay soil medium using Forcite charges to initiate the shock.
Soil mechanics, soil (material), mechanical shock, accelerometers, soil stress gages, subsurface structures, soil-structure interface, density, stiffness
McCutcheon, J. O.
Professor and chairman, McGill University, Montreal, P. Q.
Yong, R. N.
Associate professor and director of Soil Mechanics Laboratory, McGill University, Montreal, P. Q.
Savage, S. B.
Lecturer, McGill University, Montreal, P. Q.