Accession Number : AD0411210

Title :   THE RESPONSE OF SOILS TO DYNAMIC LOADINGS,

Descriptive Note : Research rept.

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Lawrence,Frederick V.

Report Date : MAR 1963

Pagination or Media Count : 1

Abstract : Dilatational waves of ultrasonic frequency are produced in a laboratory specimen of soil by energizing a barium titanate crystal, and the resultant waves picked up by a second crystal. The transit time of the wave front is observed by displaying input and output signals on an oscil loscope. Wave velocity as a function of confining pressure was measured for Ottawa sand and for glass beads. The velocity varied somewhat with specimen thickness, apparently because of dis persion of very high frequency portions of the wave front. The measured velocity varied approxi mately as the 1/4 to 1/5th power of the confining pressure, and agreed very closely with the values calculated from Brandt's equations. The measured velocities were reasonably consistent with the rod and shear wave velocities reported by Richart. (Author)

Descriptors :   (*SOILS, PROPAGATION), (*ULTRA, CRYSTALS), BARIUM COMPOUNDS, TITANIUM COMPOUNDS, VELOCITY, PRESSURE, MEASURE, SAND, GLASS, WAVE PROPAGATION, PIEZO, PULSE GENERATORS, CERAMIC, EXPERIMENTAL DATA, ERRORS, COLLOIDS, SANDSTONE, SHEAR STRESSES, ELASTICITY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE